Redis的入门实践

亦凉 2022-05-20 00:17 219阅读 0赞

一、安装

## Window 下安装 ##

下载地址：[https://github.com/MSOpenTech/redis/releases][https_github.com_MSOpenTech_redis_releases]。

Redis 支持 32 位和 64 位。这个需要根据你系统平台的实际情况选择，这里我们下载 Redis-x64-xxx.zip压缩包到 C 盘，解压后，将文件夹重新命名为 redis。

![3B8D633F-14CE-42E3-B174-FCCD48B11FF3.jpg][]

打开一个 cmd 窗口 使用cd命令切换目录到 C:\\redis 运行 redis-server.exe redis.windows.conf 。

如果想方便的话，可以把 redis 的路径加到系统的环境变量里，这样就省得再输路径了，后面的那个 redis.windows.conf 可以省略，如果省略，会启用默认的。输入之后，会显示如下界面：

![Redis 安装][Redis]

这时候另启一个cmd窗口，原来的不要关闭，不然就无法访问服务端了。

切换到redis目录下运行 redis-cli.exe -h 127.0.0.1 -p 6379 。

设置键值对 set myKey abc

取出键值对 get myKey

![Redis 安装][Redis 1]

--------------------

## Linux 下安装 ##

下载地址：[http://redis.io/download][http_redis.io_download]，下载最新稳定版本。

本教程使用的最新文档版本为 2.8.17，下载并安装：

$ wget http://download.redis.io/releases/redis-2.8.17.tar.gz
    $ tar xzf redis-2.8.17.tar.gz $ cd redis-2.8.17
    $ make

make完后 redis-2.8.17目录下会出现编译后的redis服务程序redis-server,还有用于测试的客户端程序redis-cli,两个程序位于安装目录 src 目录下：

下面启动redis服务.

$ cd src
    $ ./redis-server

注意这种方式启动redis 使用的是默认配置。也可以通过启动参数告诉redis使用指定配置文件使用下面命令启动。

$ cd src
    $ ./redis-server ../redis.conf

redis.conf 是一个默认的配置文件。我们可以根据需要使用自己的配置文件。

启动redis服务进程后，就可以使用测试客户端程序redis-cli和redis服务交互了。比如：

$ cd src
    $ ./redis-cli redis> set foo bar OK redis> get foo "bar"

--------------------

## Ubuntu 下安装 ##

在 Ubuntu 系统安装 Redis 可以使用以下命令:

$sudo apt-get update $sudo apt-get install redis-server

### 启动 Redis ###

$ redis-server

### 查看 redis 是否启动？ ###

$ redis-cli

以上命令将打开以下终端：

redis 127.0.0.1:6379>

127.0.0.1 是本机 IP ，6379 是 redis 服务端口。现在我们输入 PING 命令。

redis 127.0.0.1:6379> ping PONG

二、Redis 配置

Redis 的配置文件位于 Redis 安装目录下，文件名为 redis.conf。

你可以通过 **CONFIG** 命令查看或设置配置项。

--------------------

### 语法 ###

Redis CONFIG 命令格式如下：

redis 127.0.0.1:6379> CONFIG GET CONFIG_SETTING_NAME

### 实例 ###

redis 127.0.0.1:6379> CONFIG GET loglevel
    
    1) "loglevel"
    2) "notice"

使用 **\*** 号获取所有配置项：

### 实例 ###

redis 127.0.0.1:6379> CONFIG GET *
    
      1) "dbfilename"
      2) "dump.rdb"
      3) "requirepass"
      4) ""
      5) "masterauth"
      6) ""
      7) "unixsocket"
      8) ""
      9) "logfile"
     10) ""
     11) "pidfile"
     12) "/var/run/redis.pid"
     13) "maxmemory"
     14) "0"
     15) "maxmemory-samples"
     16) "3"
     17) "timeout"
     18) "0"
     19) "tcp-keepalive"
     20) "0"
     21) "auto-aof-rewrite-percentage"
     22) "100"
     23) "auto-aof-rewrite-min-size"
     24) "67108864"
     25) "hash-max-ziplist-entries"
     26) "512"
     27) "hash-max-ziplist-value"
     28) "64"
     29) "list-max-ziplist-entries"
     30) "512"
     31) "list-max-ziplist-value"
     32) "64"
     33) "set-max-intset-entries"
     34) "512"
     35) "zset-max-ziplist-entries"
     36) "128"
     37) "zset-max-ziplist-value"
     38) "64"
     39) "hll-sparse-max-bytes"
     40) "3000"
     41) "lua-time-limit"
     42) "5000"
     43) "slowlog-log-slower-than"
     44) "10000"
     45) "latency-monitor-threshold"
     46) "0"
     47) "slowlog-max-len"
     48) "128"
     49) "port"
     50) "6379"
     51) "tcp-backlog"
     52) "511"
     53) "databases"
     54) "16"
     55) "repl-ping-slave-period"
     56) "10"
     57) "repl-timeout"
     58) "60"
     59) "repl-backlog-size"
     60) "1048576"
     61) "repl-backlog-ttl"
     62) "3600"
     63) "maxclients"
     64) "4064"
     65) "watchdog-period"
     66) "0"
     67) "slave-priority"
     68) "100"
     69) "min-slaves-to-write"
     70) "0"
     71) "min-slaves-max-lag"
     72) "10"
     73) "hz"
     74) "10"
     75) "no-appendfsync-on-rewrite"
     76) "no"
     77) "slave-serve-stale-data"
     78) "yes"
     79) "slave-read-only"
     80) "yes"
     81) "stop-writes-on-bgsave-error"
     82) "yes"
     83) "daemonize"
     84) "no"
     85) "rdbcompression"
     86) "yes"
     87) "rdbchecksum"
     88) "yes"
     89) "activerehashing"
     90) "yes"
     91) "repl-disable-tcp-nodelay"
     92) "no"
     93) "aof-rewrite-incremental-fsync"
     94) "yes"
     95) "appendonly"
     96) "no"
     97) "dir"
     98) "/home/deepak/Downloads/redis-2.8.13/src"
     99) "maxmemory-policy"
    100) "volatile-lru"
    101) "appendfsync"
    102) "everysec"
    103) "save"
    104) "3600 1 300 100 60 10000"
    105) "loglevel"
    106) "notice"
    107) "client-output-buffer-limit"
    108) "normal 0 0 0 slave 268435456 67108864 60 pubsub 33554432 8388608 60"
    109) "unixsocketperm"
    110) "0"
    111) "slaveof"
    112) ""
    113) "notify-keyspace-events"
    114) ""
    115) "bind"
    116) ""

--------------------

## 编辑配置 ##

你可以通过修改 redis.conf 文件或使用 **CONFIG set** 命令来修改配置。

### 语法 ###

**CONFIG SET** 命令基本语法：

redis 127.0.0.1:6379> CONFIG SET CONFIG_SETTING_NAME NEW_CONFIG_VALUE

### 实例 ###

redis 127.0.0.1:6379> CONFIG SET loglevel "notice"
    OK
    redis 127.0.0.1:6379> CONFIG GET loglevel
    
    1) "loglevel"
    2) "notice"

--------------------

## 参数说明 ##

redis.conf 配置项说明如下：

1. Redis默认不是以守护进程的方式运行，可以通过该配置项修改，使用yes启用守护进程

**daemonize no**

2. 当Redis以守护进程方式运行时，Redis默认会把pid写入/var/run/redis.pid文件，可以通过pidfile指定

**pidfile /var/run/redis.pid**

3. 指定Redis监听端口，默认端口为6379，作者在自己的一篇博文中解释了为什么选用6379作为默认端口，因为6379在手机按键上MERZ对应的号码，而MERZ取自意大利歌女Alessia Merz的名字

**port 6379**

4. 绑定的主机地址

**bind 127.0.0.1**

5.当 客户端闲置多长时间后关闭连接，如果指定为0，表示关闭该功能

**timeout 300**

6. 指定日志记录级别，Redis总共支持四个级别：debug、verbose、notice、warning，默认为verbose

**loglevel verbose**

7. 日志记录方式，默认为标准输出，如果配置Redis为守护进程方式运行，而这里又配置为日志记录方式为标准输出，则日志将会发送给/dev/null

logfile stdout

8. 设置数据库的数量，默认数据库为0，可以使用SELECT <dbid>命令在连接上指定数据库id

**databases 16**

9. 指定在多长时间内，有多少次更新操作，就将数据同步到数据文件，可以多个条件配合

**save <seconds> <changes>**

Redis默认配置文件中提供了三个条件：

**save 900 1**

**    save 300 10**

**    save 60 10000**

分别表示900秒（15分钟）内有1个更改，300秒（5分钟）内有10个更改以及60秒内有10000个更改。

10. 指定存储至本地数据库时是否压缩数据，默认为yes，Redis采用LZF压缩，如果为了节省CPU时间，可以关闭该选项，但会导致数据库文件变的巨大

**rdbcompression yes**

11. 指定本地数据库文件名，默认值为dump.rdb

**dbfilename dump.rdb**

12. 指定本地数据库存放目录

**dir ./**

13. 设置当本机为slav服务时，设置master服务的IP地址及端口，在Redis启动时，它会自动从master进行数据同步

**slaveof <masterip> <masterport>**

14. 当master服务设置了密码保护时，slav服务连接master的密码

**masterauth <master-password>**

15. 设置Redis连接密码，如果配置了连接密码，客户端在连接Redis时需要通过AUTH <password>命令提供密码，默认关闭

**requirepass foobared**

16. 设置同一时间最大客户端连接数，默认无限制，Redis可以同时打开的客户端连接数为Redis进程可以打开的最大文件描述符数，如果设置 maxclients 0，表示不作限制。当客户端连接数到达限制时，Redis会关闭新的连接并向客户端返回max number of clients reached错误信息

**maxclients 128**

17. 指定Redis最大内存限制，Redis在启动时会把数据加载到内存中，达到最大内存后，Redis会先尝试清除已到期或即将到期的Key，当此方法处理 后，仍然到达最大内存设置，将无法再进行写入操作，但仍然可以进行读取操作。Redis新的vm机制，会把Key存放内存，Value会存放在swap区

**maxmemory <bytes>**

18. 指定是否在每次更新操作后进行日志记录，Redis在默认情况下是异步的把数据写入磁盘，如果不开启，可能会在断电时导致一段时间内的数据丢失。因为 redis本身同步数据文件是按上面save条件来同步的，所以有的数据会在一段时间内只存在于内存中。默认为no

**appendonly no**

19. 指定更新日志文件名，默认为appendonly.aof

**appendfilename appendonly.aof**

20. 指定更新日志条件，共有3个可选值：  
    **no**：表示等操作系统进行数据缓存同步到磁盘（快）  
    **always**：表示每次更新操作后手动调用fsync()将数据写到磁盘（慢，安全）  
    **everysec**：表示每秒同步一次（折衷，默认值）

**appendfsync everysec**

21. 指定是否启用虚拟内存机制，默认值为no，简单的介绍一下，VM机制将数据分页存放，由Redis将访问量较少的页即冷数据swap到磁盘上，访问多的页面由磁盘自动换出到内存中（在后面的文章我会仔细分析Redis的VM机制）

**vm-enabled no**

22. 虚拟内存文件路径，默认值为/tmp/redis.swap，不可多个Redis实例共享

**vm-swap-file /tmp/redis.swap**

23. 将所有大于vm-max-memory的数据存入虚拟内存,无论vm-max-memory设置多小,所有索引数据都是内存存储的(Redis的索引数据 就是keys),也就是说,当vm-max-memory设置为0的时候,其实是所有value都存在于磁盘。默认值为0

**vm-max-memory 0**

24. Redis swap文件分成了很多的page，一个对象可以保存在多个page上面，但一个page上不能被多个对象共享，vm-page-size是要根据存储的 数据大小来设定的，作者建议如果存储很多小对象，page大小最好设置为32或者64bytes；如果存储很大大对象，则可以使用更大的page，如果不 确定，就使用默认值

**vm-page-size 32**

25. 设置swap文件中的page数量，由于页表（一种表示页面空闲或使用的bitmap）是在放在内存中的，，在磁盘上每8个pages将消耗1byte的内存。

**vm-pages 134217728**

26. 设置访问swap文件的线程数,最好不要超过机器的核数,如果设置为0,那么所有对swap文件的操作都是串行的，可能会造成比较长时间的延迟。默认值为4

**vm-max-threads 4**

27. 设置在向客户端应答时，是否把较小的包合并为一个包发送，默认为开启

**glueoutputbuf yes**

28. 指定在超过一定的数量或者最大的元素超过某一临界值时，采用一种特殊的哈希算法

**hash-max-zipmap-entries 64**

**    hash-max-zipmap-value 512**

29. 指定是否激活重置哈希，默认为开启（后面在介绍Redis的哈希算法时具体介绍）

**activerehashing yes**

30. 指定包含其它的配置文件，可以在同一主机上多个Redis实例之间使用同一份配置文件，而同时各个实例又拥有自己的特定配置文件

**include /path/to/local.conf**

三、Redis 数据类型

Redis支持五种数据类型：string（字符串），hash（哈希），list（列表），set（集合）及zset(sorted set：有序集合)。

--------------------

## String（字符串） ##

string是redis最基本的类型，你可以理解成与Memcached一模一样的类型，一个key对应一个value。

string类型是二进制安全的。意思是redis的string可以包含任何数据。比如jpg图片或者序列化的对象。

string类型是Redis最基本的数据类型，一个键最大能存储512MB。

### 实例 ###

redis 127.0.0.1:6379> SET name "runoob"
    OK
    redis 127.0.0.1:6379> GET name
    "runoob"

在以上实例中我们使用了 Redis 的 SET 和 GET 命令。键为 name，对应的值为 runoob。

注意：一个键最大能存储512MB。

--------------------

## Hash（哈希） ##

Redis hash 是一个键值(key=>value)对集合。

Redis hash 是一个 string 类型的 field 和 value 的映射表，hash 特别适合用于存储对象。

### 实例 ###

redis> HMSET myhash field1 "Hello" field2 "World"
    "OK"
    redis> HGET myhash field1
    "Hello"
    redis> HGET myhash field2
    "World"

实例中我们使用了 Redis HMSET, HGET 命令，HMSET 设置了两个 field=>value 对, HGET 获取对应 field 对应的 value。

每个 hash 可以存储 2 32  \-1 键值对（40多亿）。

--------------------

## List（列表） ##

Redis 列表是简单的字符串列表，按照插入顺序排序。你可以添加一个元素到列表的头部（左边）或者尾部（右边）。

### 实例 ###

redis 127.0.0.1:6379> lpush runoob redis
    (integer) 1
    redis 127.0.0.1:6379> lpush runoob mongodb
    (integer) 2
    redis 127.0.0.1:6379> lpush runoob rabitmq
    (integer) 3
    redis 127.0.0.1:6379> lrange runoob 0 10
    1) "rabitmq"
    2) "mongodb"
    3) "redis"
    redis 127.0.0.1:6379>

列表最多可存储 232 \- 1 元素 (4294967295, 每个列表可存储40多亿)。

--------------------

## Set（集合） ##

Redis的Set是string类型的无序集合。

集合是通过哈希表实现的，所以添加，删除，查找的复杂度都是O(1)。

### sadd 命令 ###

添加一个 string 元素到 key 对应的 set 集合中，成功返回1，如果元素已经在集合中返回 0，如果 key 对应的 set 不存在则返回错误。

sadd key member

### 实例 ###

redis 127.0.0.1:6379> sadd runoob redis
    (integer) 1
    redis 127.0.0.1:6379> sadd runoob mongodb
    (integer) 1
    redis 127.0.0.1:6379> sadd runoob rabitmq
    (integer) 1
    redis 127.0.0.1:6379> sadd runoob rabitmq
    (integer) 0
    redis 127.0.0.1:6379> smembers runoob
    
    1) "redis"
    2) "rabitmq"
    3) "mongodb"

注意：以上实例中 rabitmq 添加了两次，但根据集合内元素的唯一性，第二次插入的元素将被忽略。

集合中最大的成员数为 232 \- 1(4294967295, 每个集合可存储40多亿个成员)。

--------------------

## zset(sorted set：有序集合) ##

Redis zset 和 set 一样也是string类型元素的集合,且不允许重复的成员。

不同的是每个元素都会关联一个double类型的分数。redis正是通过分数来为集合中的成员进行从小到大的排序。

zset的成员是唯一的,但分数(score)却可以重复。

### zadd 命令 ###

添加元素到集合，元素在集合中存在则更新对应score

zadd key score member

### 实例 ###

redis 127.0.0.1:6379> zadd runoob 0 redis
    (integer) 1
    redis 127.0.0.1:6379> zadd runoob 0 mongodb
    (integer) 1
    redis 127.0.0.1:6379> zadd runoob 0 rabitmq
    (integer) 1
    redis 127.0.0.1:6379> zadd runoob 0 rabitmq
    (integer) 0
    redis 127.0.0.1:6379> > ZRANGEBYSCORE runoob 0 1000
    1) "mongodb"
    2) "rabitmq"
    3) "redis"

四、Redis 命令

Redis 命令用于在 redis 服务上执行操作。

要在 redis 服务上执行命令需要一个 redis 客户端。Redis 客户端在我们之前下载的的 redis 的安装包中。

### 语法 ###

Redis 客户端的基本语法为：

$ redis-cli

### 实例 ###

以下实例讲解了如何启动 redis 客户端：

启动 redis 客户端，打开终端并输入命令 redis-cli。该命令会连接本地的 redis 服务。

$redis-cli redis 127.0.0.1:6379>
    redis 127.0.0.1:6379> PING PONG

在以上实例中我们连接到本地的 redis 服务并执行 PING 命令，该命令用于检测 redis 服务是否启动。

--------------------

## 在远程服务上执行命令 ##

如果需要在远程 redis 服务上执行命令，同样我们使用的也是 redis-cli 命令。

### 语法 ###

$ redis-cli -h host -p port -a password

### 实例 ###

以下实例演示了如何连接到主机为 127.0.0.1，端口为 6379 ，密码为 mypass 的 redis 服务上。

$redis-cli -h 127.0.0.1 -p 6379 -a "mypass"
    redis 127.0.0.1:6379>
    redis 127.0.0.1:6379> PING PONG

五、Redis 键(key)

Redis 键命令用于管理 redis 的键。

### 语法 ###

Redis 键命令的基本语法如下：

redis 127.0.0.1:6379> COMMAND KEY_NAME

### 实例 ###

redis 127.0.0.1:6379> SET runoobkey redis OK redis 127.0.0.1:6379> DEL runoobkey (integer) 1

在以上实例中 DEL 是一个命令， runoobkey 是一个键。如果键被删除成功，命令执行后输出 (integer) 1，否则将输出 (integer) 0

--------------------

## Redis keys 命令 ##

下表给出了与 Redis 键相关的基本命令：

<table style="background-color:transparent;border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:.5px;border-collapse:collapse;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:.5px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:.5px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:.5px;color:rgb(51,51,51);font-family:'Helvetica Neue', Helvetica, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', Arial, sans-serif;font-size:12px;font-style:normal;font-variant:normal;font-weight:400;letter-spacing:normal;margin-left:0px;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;word-spacing:0px;"> 
 <tbody style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <th style="background-color:rgb(85,85,85);border-bottom-color:rgb(85,85,85);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(85,85,85);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(85,85,85);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(85,85,85);border-top-style:solid;border-top-width:.5px;color:rgb(255,255,255);font-size:12px;margin-left:0px;text-align:left;vertical-align:top;width:29.47px;">序号</th> 
   <th style="background-color:rgb(85,85,85);border-bottom-color:rgb(85,85,85);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(85,85,85);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(85,85,85);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(85,85,85);border-top-style:solid;border-top-width:.5px;color:rgb(255,255,255);font-size:12px;margin-left:0px;text-align:left;vertical-align:top;">命令及描述</th> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">1</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-del.html" rel="nofollow">DEL key</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">该命令用于在 key 存在时删除 key。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">2</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-dump.html" rel="nofollow">DUMP key</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">序列化给定 key ，并返回被序列化的值。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">3</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-exists.html" rel="nofollow">EXISTS key</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">检查给定 key 是否存在。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">4</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-expire.html" rel="nofollow">EXPIRE key</a> seconds<br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">为给定 key 设置过期时间。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">5</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-expireat.html" rel="nofollow">EXPIREAT key timestamp</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">EXPIREAT 的作用和 EXPIRE 类似，都用于为 key 设置过期时间。不同在于 EXPIREAT 命令接受的时间参数是 UNIX 时间戳(unix timestamp)。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">6</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-pexpire.html" rel="nofollow">PEXPIRE key milliseconds</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">设置 key 的过期时间以毫秒计。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">7</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-pexpireat.html" rel="nofollow">PEXPIREAT key milliseconds-timestamp</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">设置 key 过期时间的时间戳(unix timestamp) 以毫秒计</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">8</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-keys.html" rel="nofollow">KEYS pattern</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">查找所有符合给定模式( pattern)的 key 。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">9</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-move.html" rel="nofollow">MOVE key db</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">将当前数据库的 key 移动到给定的数据库 db 当中。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">10</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-persist.html" rel="nofollow">PERSIST key</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">移除 key 的过期时间，key 将持久保持。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">11</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-pttl.html" rel="nofollow">PTTL key</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">以毫秒为单位返回 key 的剩余的过期时间。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">12</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-ttl.html" rel="nofollow">TTL key</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">以秒为单位，返回给定 key 的剩余生存时间(TTL, time to live)。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">13</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-randomkey.html" rel="nofollow">RANDOMKEY</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">从当前数据库中随机返回一个 key 。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">14</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-rename.html" rel="nofollow">RENAME key newkey</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">修改 key 的名称</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">15</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-renamenx.html" rel="nofollow">RENAMENX key newkey</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">仅当 newkey 不存在时，将 key 改名为 newkey 。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">16</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/keys-type.html" rel="nofollow">TYPE key</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回 key 所储存的值的类型。</td> 
  </tr> 
 </tbody> 
</table>

更多命令请参考：[https://redis.io/commands][https_redis.io_commands]

六、Redis字符串

## Redis 字符串命令 ##

下表列出了常用的 redis 字符串命令：

<table style="background-color:transparent;border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:.5px;border-collapse:collapse;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:.5px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:.5px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:.5px;color:rgb(51,51,51);font-family:'Helvetica Neue', Helvetica, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', Arial, sans-serif;font-size:12px;font-style:normal;font-variant:normal;font-weight:400;letter-spacing:normal;margin-left:0px;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;word-spacing:0px;"> 
 <tbody style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <th style="background-color:rgb(85,85,85);border-bottom-color:rgb(85,85,85);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(85,85,85);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(85,85,85);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(85,85,85);border-top-style:solid;border-top-width:.5px;color:rgb(255,255,255);font-size:12px;margin-left:0px;text-align:left;vertical-align:top;width:29.47px;">序号</th> 
   <th style="background-color:rgb(85,85,85);border-bottom-color:rgb(85,85,85);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(85,85,85);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(85,85,85);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(85,85,85);border-top-style:solid;border-top-width:.5px;color:rgb(255,255,255);font-size:12px;margin-left:0px;text-align:left;vertical-align:top;">命令及描述</th> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">1</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-set.html" rel="nofollow">SET key value</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">设置指定 key 的值</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">2</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-get.html" rel="nofollow">GET key</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">获取指定 key 的值。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">3</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-getrange.html" rel="nofollow">GETRANGE key start end</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回 key 中字符串值的子字符</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">4</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-getset.html" rel="nofollow">GETSET key value</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">将给定 key 的值设为 value ，并返回 key 的旧值(old value)。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">5</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-getbit.html" rel="nofollow">GETBIT key offset</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">对 key 所储存的字符串值，获取指定偏移量上的位(bit)。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">6</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-mget.html" rel="nofollow">MGET key1 [key2..]</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">获取所有(一个或多个)给定 key 的值。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">7</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-setbit.html" rel="nofollow">SETBIT key offset value</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">对 key 所储存的字符串值，设置或清除指定偏移量上的位(bit)。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">8</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-setex.html" rel="nofollow">SETEX key seconds value</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">将值 value 关联到 key ，并将 key 的过期时间设为 seconds (以秒为单位)。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">9</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-setnx.html" rel="nofollow">SETNX key value</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">只有在 key 不存在时设置 key 的值。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">10</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-setrange.html" rel="nofollow">SETRANGE key offset value</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">用 value 参数覆写给定 key 所储存的字符串值，从偏移量 offset 开始。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">11</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-strlen.html" rel="nofollow">STRLEN key</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回 key 所储存的字符串值的长度。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">12</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-mset.html" rel="nofollow">MSET key value [key value ...]</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">同时设置一个或多个 key-value 对。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">13</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-msetnx.html" rel="nofollow">MSETNX key value [key value ...]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">同时设置一个或多个 key-value 对，当且仅当所有给定 key 都不存在。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">14</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-psetex.html" rel="nofollow">PSETEX key milliseconds value</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">这个命令和 SETEX 命令相似，但它以毫秒为单位设置 key 的生存时间，而不是像 SETEX 命令那样，以秒为单位。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">15</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-incr.html" rel="nofollow">INCR key</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">将 key 中储存的数字值增一。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">16</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-incrby.html" rel="nofollow">INCRBY key increment</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">将 key 所储存的值加上给定的增量值（increment） 。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">17</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-incrbyfloat.html" rel="nofollow">INCRBYFLOAT key increment</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">将 key 所储存的值加上给定的浮点增量值（increment） 。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">18</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-decr.html" rel="nofollow">DECR key</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">将 key 中储存的数字值减一。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">19</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-decrby.html" rel="nofollow">DECRBY key decrement</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;"> key 所储存的值减去给定的减量值（decrement） 。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">20</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/strings-append.html" rel="nofollow">APPEND key value</a><br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">如果 key 已经存在并且是一个字符串， APPEND 命令将指定的 value 追加到该 key 原来值（value）的末尾。</td> 
  </tr> 
 </tbody> 
</table>

更多命令请参考：[https://redis.io/commands][https_redis.io_commands]

七、Redis hash 命令

下表列出了 redis hash 基本的相关命令：

更多命令请参考：[https://redis.io/commands][https_redis.io_commands]

八、Redis 列表(List)

Redis列表是简单的字符串列表，按照插入顺序排序。你可以添加一个元素到列表的头部（左边）或者尾部（右边）

一个列表最多可以包含 232 \- 1 个元素 (4294967295, 每个列表超过40亿个元素)。

### 实例 ###

redis 127.0.0.1:6379> LPUSH runoobkey redis (integer) 1
    redis 127.0.0.1:6379> LPUSH runoobkey mongodb (integer) 2
    redis 127.0.0.1:6379> LPUSH runoobkey mysql (integer) 3
    redis 127.0.0.1:6379> LRANGE runoobkey 0 10
    
    1) "mysql"
    2) "mongodb"
    3) "redis"

在以上实例中我们使用了 LPUSH 将三个值插入了名为 runoobkey 的列表当中。

### Redis 列表命令 ###

下表列出了列表相关的基本命令：

<table style="background-color:transparent;border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:.5px;border-collapse:collapse;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:.5px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:.5px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:.5px;color:rgb(51,51,51);font-family:'Helvetica Neue', Helvetica, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', Arial, sans-serif;font-size:12px;font-style:normal;font-variant:normal;font-weight:400;letter-spacing:normal;margin-left:0px;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;word-spacing:0px;"> 
 <tbody style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <th style="background-color:rgb(85,85,85);border-bottom-color:rgb(85,85,85);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(85,85,85);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(85,85,85);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(85,85,85);border-top-style:solid;border-top-width:.5px;color:rgb(255,255,255);font-size:12px;margin-left:0px;text-align:left;vertical-align:top;width:29.47px;">序号</th> 
   <th style="background-color:rgb(85,85,85);border-bottom-color:rgb(85,85,85);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(85,85,85);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(85,85,85);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(85,85,85);border-top-style:solid;border-top-width:.5px;color:rgb(255,255,255);font-size:12px;margin-left:0px;text-align:left;vertical-align:top;">命令及描述</th> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">1</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-blpop.html" rel="nofollow">BLPOP key1 [key2 ] timeout</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">移出并获取列表的第一个元素， 如果列表没有元素会阻塞列表直到等待超时或发现可弹出元素为止。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">2</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-brpop.html" rel="nofollow">BRPOP key1 [key2 ] timeout</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">移出并获取列表的最后一个元素， 如果列表没有元素会阻塞列表直到等待超时或发现可弹出元素为止。</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">3</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-brpoplpush.html" rel="nofollow">BRPOPLPUSH source destination timeout</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">从列表中弹出一个值，将弹出的元素插入到另外一个列表中并返回它； 如果列表没有元素会阻塞列表直到等待超时或发现可弹出元素为止。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">4</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-lindex.html" rel="nofollow">LINDEX key index</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">通过索引获取列表中的元素</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">5</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-linsert.html" rel="nofollow">LINSERT key BEFORE|AFTER pivot value</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">在列表的元素前或者后插入元素</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">6</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-llen.html" rel="nofollow">LLEN key</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">获取列表长度</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">7</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-lpop.html" rel="nofollow">LPOP key</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">移出并获取列表的第一个元素</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">8</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-lpush.html" rel="nofollow">LPUSH key value1 [value2]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">将一个或多个值插入到列表头部</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">9</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-lpushx.html" rel="nofollow">LPUSHX key value</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">将一个值插入到已存在的列表头部</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">10</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-lrange.html" rel="nofollow">LRANGE key start stop</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">获取列表指定范围内的元素</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">11</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-lrem.html" rel="nofollow">LREM key count value</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">移除列表元素</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">12</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-lset.html" rel="nofollow">LSET key index value</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">通过索引设置列表元素的值</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">13</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-ltrim.html" rel="nofollow">LTRIM key start stop</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">对一个列表进行修剪(trim)，就是说，让列表只保留指定区间内的元素，不在指定区间之内的元素都将被删除。</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">14</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-rpop.html" rel="nofollow">RPOP key</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">移除并获取列表最后一个元素</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">15</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-rpoplpush.html" rel="nofollow">RPOPLPUSH source destination</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">移除列表的最后一个元素，并将该元素添加到另一个列表并返回</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">16</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-rpush.html" rel="nofollow">RPUSH key value1 [value2]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">在列表中添加一个或多个值</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">17</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/lists-rpushx.html" rel="nofollow">RPUSHX key value</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">为已存在的列表添加值</td> 
  </tr> 
 </tbody> 
</table>

九、Redis 集合(Set)

Redis 的 Set 是 String 类型的无序集合。集合成员是唯一的，这就意味着集合中不能出现重复的数据。

Redis 中集合是通过哈希表实现的，所以添加，删除，查找的复杂度都是 O(1)。

集合中最大的成员数为 232 - 1 (4294967295, 每个集合可存储40多亿个成员)。

### 实例 ###

redis 127.0.0.1:6379> SADD runoobkey redis (integer) 1
    redis 127.0.0.1:6379> SADD runoobkey mongodb (integer) 1
    redis 127.0.0.1:6379> SADD runoobkey mysql (integer) 1
    redis 127.0.0.1:6379> SADD runoobkey mysql (integer) 0
    redis 127.0.0.1:6379> SMEMBERS runoobkey 1) "mysql"
    2) "mongodb"
    3) "redis"

在以上实例中我们通过 SADD 命令向名为 runoobkey 的集合插入的三个元素。

--------------------

## Redis 集合命令 ##

下表列出了 Redis 集合基本命令：

<table style="background-color:transparent;border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:.5px;border-collapse:collapse;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:.5px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:.5px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:.5px;color:rgb(51,51,51);font-family:'Helvetica Neue', Helvetica, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', Arial, sans-serif;font-size:12px;font-style:normal;font-variant:normal;font-weight:400;letter-spacing:normal;margin-left:0px;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;word-spacing:0px;"> 
 <tbody style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <th style="background-color:rgb(85,85,85);border-bottom-color:rgb(85,85,85);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(85,85,85);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(85,85,85);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(85,85,85);border-top-style:solid;border-top-width:.5px;color:rgb(255,255,255);font-size:12px;margin-left:0px;text-align:left;vertical-align:top;width:29.47px;">序号</th> 
   <th style="background-color:rgb(85,85,85);border-bottom-color:rgb(85,85,85);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(85,85,85);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(85,85,85);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(85,85,85);border-top-style:solid;border-top-width:.5px;color:rgb(255,255,255);font-size:12px;margin-left:0px;text-align:left;vertical-align:top;">命令及描述</th> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">1</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-sadd.html" rel="nofollow">SADD key member1 [member2]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">向集合添加一个或多个成员</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">2</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-scard.html" rel="nofollow">SCARD key</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">获取集合的成员数</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">3</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-sdiff.html" rel="nofollow">SDIFF key1 [key2]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回给定所有集合的差集</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">4</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-sdiffstore.html" rel="nofollow">SDIFFSTORE destination key1 [key2]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回给定所有集合的差集并存储在 destination 中</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">5</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-sinter.html" rel="nofollow">SINTER key1 [key2]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回给定所有集合的交集</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">6</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-sinterstore.html" rel="nofollow">SINTERSTORE destination key1 [key2]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回给定所有集合的交集并存储在 destination 中</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">7</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-sismember.html" rel="nofollow">SISMEMBER key member</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">判断 member 元素是否是集合 key 的成员</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">8</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-smembers.html" rel="nofollow">SMEMBERS key</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回集合中的所有成员</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">9</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-smove.html" rel="nofollow">SMOVE source destination member</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">将 member 元素从 source 集合移动到 destination 集合</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">10</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-spop.html" rel="nofollow">SPOP key</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">移除并返回集合中的一个随机元素</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">11</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-srandmember.html" rel="nofollow">SRANDMEMBER key [count]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回集合中一个或多个随机数</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">12</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-srem.html" rel="nofollow">SREM key member1 [member2]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">移除集合中一个或多个成员</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">13</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-sunion.html" rel="nofollow">SUNION key1 [key2]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回所有给定集合的并集</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">14</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-sunionstore.html" rel="nofollow">SUNIONSTORE destination key1 [key2]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">所有给定集合的并集存储在 destination 集合中</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">15</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sets-sscan.html" rel="nofollow">SSCAN key cursor [MATCH pattern] [COUNT count]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">迭代集合中的元素</td> 
  </tr> 
 </tbody> 
</table>

十、Redis 有序集合(sorted set)

Redis 有序集合和集合一样也是string类型元素的集合,且不允许重复的成员。

不同的是每个元素都会关联一个double类型的分数。redis正是通过分数来为集合中的成员进行从小到大的排序。

有序集合的成员是唯一的,但分数(score)却可以重复。

集合是通过哈希表实现的，所以添加，删除，查找的复杂度都是O(1)。 集合中最大的成员数为 232 - 1 (4294967295, 每个集合可存储40多亿个成员)。

### 实例 ###

redis 127.0.0.1:6379> ZADD runoobkey 1 redis (integer) 1
    redis 127.0.0.1:6379> ZADD runoobkey 2 mongodb (integer) 1
    redis 127.0.0.1:6379> ZADD runoobkey 3 mysql (integer) 1
    redis 127.0.0.1:6379> ZADD runoobkey 3 mysql (integer) 0
    redis 127.0.0.1:6379> ZADD runoobkey 4 mysql (integer) 0
    redis 127.0.0.1:6379> ZRANGE runoobkey 0 10 WITHSCORES 1) "redis"
    2) "1"
    3) "mongodb"
    4) "2"
    5) "mysql"
    6) "4"

在以上实例中我们通过命令 ZADD 向 redis 的有序集合中添加了三个值并关联上分数。

--------------------

## Redis 有序集合命令 ##

下表列出了 redis 有序集合的基本命令:

<table style="background-color:transparent;border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:.5px;border-collapse:collapse;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:.5px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:.5px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:.5px;color:rgb(51,51,51);font-family:'Helvetica Neue', Helvetica, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', Arial, sans-serif;font-size:12px;font-style:normal;font-variant:normal;font-weight:400;letter-spacing:normal;margin-left:0px;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;word-spacing:0px;"> 
 <tbody style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <th style="background-color:rgb(85,85,85);border-bottom-color:rgb(85,85,85);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(85,85,85);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(85,85,85);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(85,85,85);border-top-style:solid;border-top-width:.5px;color:rgb(255,255,255);font-size:12px;margin-left:0px;text-align:left;vertical-align:top;width:29.47px;">序号</th> 
   <th style="background-color:rgb(85,85,85);border-bottom-color:rgb(85,85,85);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(85,85,85);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(85,85,85);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(85,85,85);border-top-style:solid;border-top-width:.5px;color:rgb(255,255,255);font-size:12px;margin-left:0px;text-align:left;vertical-align:top;">命令及描述</th> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">1</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zadd.html" rel="nofollow">ZADD key score1 member1 [score2 member2]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">向有序集合添加一个或多个成员，或者更新已存在成员的分数</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">2</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zcard.html" rel="nofollow">ZCARD key</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">获取有序集合的成员数</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">3</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zcount.html" rel="nofollow">ZCOUNT key min max</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">计算在有序集合中指定区间分数的成员数</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">4</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zincrby.html" rel="nofollow">ZINCRBY key increment member</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">有序集合中对指定成员的分数加上增量 increment</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">5</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zinterstore.html" rel="nofollow">ZINTERSTORE destination numkeys key [key ...]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">计算给定的一个或多个有序集的交集并将结果集存储在新的有序集合 key 中</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">6</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zlexcount.html" rel="nofollow">ZLEXCOUNT key min max</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">在有序集合中计算指定字典区间内成员数量</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">7</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zrange.html" rel="nofollow">ZRANGE key start stop [WITHSCORES]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">通过索引区间返回有序集合成指定区间内的成员</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">8</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zrangebylex.html" rel="nofollow">ZRANGEBYLEX key min max [LIMIT offset count]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">通过字典区间返回有序集合的成员</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">9</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zrangebyscore.html" rel="nofollow">ZRANGEBYSCORE key min max [WITHSCORES] [LIMIT]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">通过分数返回有序集合指定区间内的成员</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">10</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zrank.html" rel="nofollow">ZRANK key member</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回有序集合中指定成员的索引</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">11</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zrem.html" rel="nofollow">ZREM key member [member ...]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">移除有序集合中的一个或多个成员</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">12</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zremrangebylex.html" rel="nofollow">ZREMRANGEBYLEX key min max</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">移除有序集合中给定的字典区间的所有成员</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">13</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zremrangebyrank.html" rel="nofollow">ZREMRANGEBYRANK key start stop</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">移除有序集合中给定的排名区间的所有成员</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">14</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zremrangebyscore.html" rel="nofollow">ZREMRANGEBYSCORE key min max</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">移除有序集合中给定的分数区间的所有成员</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">15</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zrevrange.html" rel="nofollow">ZREVRANGE key start stop [WITHSCORES]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回有序集中指定区间内的成员，通过索引，分数从高到底</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">16</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zrevrangebyscore.html" rel="nofollow">ZREVRANGEBYSCORE key max min [WITHSCORES]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回有序集中指定分数区间内的成员，分数从高到低排序</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">17</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zrevrank.html" rel="nofollow">ZREVRANK key member</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回有序集合中指定成员的排名，有序集成员按分数值递减(从大到小)排序</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">18</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zscore.html" rel="nofollow">ZSCORE key member</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">返回有序集中，成员的分数值</td> 
  </tr> 
  <tr style="background-color:rgb(255,255,255);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">19</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zunionstore.html" rel="nofollow">ZUNIONSTORE destination numkeys key [key ...]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">计算给定的一个或多个有序集的并集，并存储在新的 key 中</td> 
  </tr> 
  <tr style="background-color:rgb(246,244,240);border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;margin-left:0px;"> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;">20</td> 
   <td style="border-bottom-color:rgb(212,212,212);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(212,212,212);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(212,212,212);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(212,212,212);border-top-style:solid;border-top-width:.5px;font-size:13px;line-height:26px;margin-left:0px;min-width:24px;vertical-align:top;"><a style="border-bottom-color:rgb(100,133,76);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(100,133,76);border-left-style:none;border-left-width:0px;border-right-color:rgb(100,133,76);border-right-style:none;border-right-width:0px;border-top-color:rgb(100,133,76);border-top-style:none;border-top-width:0px;color:rgb(100,133,76);margin-left:0px;text-decoration:underline;" href="http://www.runoob.com/redis/sorted-sets-zscan.html" rel="nofollow">ZSCAN key cursor [MATCH pattern] [COUNT count]</a> <br style="border-bottom-color:rgb(51,51,51);border-bottom-style:none;border-bottom-width:0px;border-left-color:rgb(51,51,51);border-left-style:none;border-left-width:0px;border-right-color:rgb(51,51,51);border-right-style:none;border-right-width:0px;border-top-color:rgb(51,51,51);border-top-style:none;border-top-width:0px;font-size:13px;line-height:26px;margin-left:0px;min-width:0px;vertical-align:baseline;">迭代有序集合中的元素（包括元素成员和元素分值）</td> 
  </tr> 
 </tbody> 
</table>

十一、Redis HyperLogLog

Redis 在 2.8.9 版本添加了 HyperLogLog 结构。

Redis HyperLogLog 是用来做基数统计的算法，HyperLogLog 的优点是，在输入元素的数量或者体积非常非常大时，计算基数所需的空间总是固定的、并且是很小的。

在 Redis 里面，每个 HyperLogLog 键只需要花费 12 KB 内存，就可以计算接近 2^64 个不同元素的基数。这和计算基数时，元素越多耗费内存就越多的集合形成鲜明对比。

但是，因为 HyperLogLog 只会根据输入元素来计算基数，而不会储存输入元素本身，所以HyperLogLog 不能像集合那样，返回输入的各个元素。

--------------------

## 什么是基数? ##

比如数据集 \{1, 3, 5, 7, 5, 7, 8\}， 那么这个数据集的基数集为 \{1, 3, 5 ,7, 8\}, 基数(不重复元素)为5。 基数估计就是在误差可接受的范围内，快速计算基数。

--------------------

## 实例 ##

以下实例演示了 HyperLogLog 的工作过程：

redis 127.0.0.1:6379> PFADD runoobkey "redis"
    
    1) (integer) 1
    
    redis 127.0.0.1:6379> PFADD runoobkey "mongodb"
    
    1) (integer) 1
    
    redis 127.0.0.1:6379> PFADD runoobkey "mysql"
    
    1) (integer) 1
    
    redis 127.0.0.1:6379> PFCOUNT runoobkey (integer) 3

--------------------

## Redis HyperLogLog 命令 ##

下表列出了 redis HyperLogLog 的基本命令：

十二、Redis 发布订阅

Redis 发布订阅(pub/sub)是一种消息通信模式：发送者(pub)发送消息，订阅者(sub)接收消息。

Redis 客户端可以订阅任意数量的频道。

下图展示了频道 channel1 ， 以及订阅这个频道的三个客户端 —— client2 、 client5 和 client1 之间的关系：

![pubsub1][]

当有新消息通过 PUBLISH 命令发送给频道 channel1 时， 这个消息就会被发送给订阅它的三个客户端：

![pubsub2][]

--------------------

## 实例 ##

以下实例演示了发布订阅是如何工作的。在我们实例中我们创建了订阅频道名为 redisChat:

redis 127.0.0.1:6379> SUBSCRIBE redisChat Reading messages... (press Ctrl-C to quit)
    1) "subscribe"
    2) "redisChat"
    3) (integer) 1

现在，我们先重新开启个 redis 客户端，然后在同一个频道 redisChat 发布两次消息，订阅者就能接收到消息。

redis 127.0.0.1:6379> PUBLISH redisChat "Redis is a great caching technique"
    
    (integer) 1
    
    redis 127.0.0.1:6379> PUBLISH redisChat "Learn redis by runoob.com"
    
    (integer) 1
    
    # 订阅者的客户端会显示如下消息
    1) "message"
    2) "redisChat"
    3) "Redis is a great caching technique"
    1) "message"
    2) "redisChat"
    3) "Learn redis by runoob.com"

--------------------

## Redis 发布订阅命令 ##

下表列出了 redis 发布订阅常用命令：

十三、Redis 事务

Redis 事务可以一次执行多个命令， 并且带有以下两个重要的保证：

*  批量操作在发送 EXEC 命令前被放入队列缓存。
 *  收到 EXEC 命令后进入事务执行，事务中任意命令执行失败，其余的命令依然被执行。
 *  在事务执行过程，其他客户端提交的命令请求不会插入到事务执行命令序列中。

一个事务从开始到执行会经历以下三个阶段：

*  开始事务。
 *  命令入队。
 *  执行事务。

--------------------

## 实例 ##

以下是一个事务的例子， 它先以 MULTI 开始一个事务， 然后将多个命令入队到事务中， 最后由 EXEC 命令触发事务， 一并执行事务中的所有命令：

redis 127.0.0.1:6379> MULTI OK redis 127.0.0.1:6379> SET book-name "Mastering C++ in 21 days"
    QUEUED
    
    redis 127.0.0.1:6379> GET book-name QUEUED redis 127.0.0.1:6379> SADD tag "C++" "Programming" "Mastering Series"
    QUEUED
    
    redis 127.0.0.1:6379> SMEMBERS tag QUEUED redis 127.0.0.1:6379> EXEC 1) OK 2) "Mastering C++ in 21 days"
    3) (integer) 3
    4) 1) "Mastering Series"
     2) "C++"
     3) "Programming"

单个 Redis 命令的执行是原子性的，但 Redis 没有在事务上增加任何维持原子性的机制，所以 Redis 事务的执行并不是原子性的。

事务可以理解为一个打包的批量执行脚本，但批量指令并非原子化的操作，中间某条指令的失败不会导致前面已做指令的回滚，也不会造成后续的指令不做。

> 这是官网上的说明 From redis docs on [transactions][]:
> 
> It's important to note that even when a command fails, all the other commands in the queue are processed – Redis will not stop the processing of commands.

比如：

redis 127.0.0.1:7000> multi OK redis 127.0.0.1:7000> set a aaa QUEUED redis 127.0.0.1:7000> set b bbb QUEUED redis 127.0.0.1:7000> set c ccc QUEUED redis 127.0.0.1:7000> exec
    1) OK 2) OK 3) OK

如果在 set b bbb 处失败，set a 已成功不会回滚，set c 还会继续执行。

--------------------

## Redis 事务命令 ##

下表列出了 redis 事务的相关命令：

十五、Redis 脚本

Redis 脚本使用 Lua 解释器来执行脚本。 Reids 2.6 版本通过内嵌支持 Lua 环境。执行脚本的常用命令为 EVAL。

### 语法 ###

Eval 命令的基本语法如下：

redis 127.0.0.1:6379> EVAL script numkeys key [key ...] arg [arg ...]

### 实例 ###

以下实例演示了 redis 脚本工作过程：

redis 127.0.0.1:6379> EVAL "return {KEYS[1],KEYS[2],ARGV[1],ARGV[2]}" 2 key1 key2 first second 1) "key1"
    2) "key2"
    3) "first"
    4) "second"

--------------------

## Redis 脚本命令 ##

下表列出了 redis 脚本常用命令：

十六、Redis 连接

[https_github.com_MSOpenTech_redis_releases]: https://github.com/MSOpenTech/redis/releases
[3B8D633F-14CE-42E3-B174-FCCD48B11FF3.jpg]: /images/20220520/9eea4669114c47069310a3fe11690664.png
[Redis]: /images/20220520/7e4579aa9b8b460d988c32379d12ff0a.png
[Redis 1]: /images/20220520/678a85c60227443b95ecca37329caf93.png
[http_redis.io_download]: http://redis.io/download
[https_redis.io_commands]: https://redis.io/commands
[pubsub1]: /images/20220520/068126be61eb4d61a3ca5431d98b3411.png
[pubsub2]: /images/20220520/46461fa6d657484e975a1cf3e5dfb25c.png
[transactions]: http://redis.io/topics/transactions