try Redis

末蓝、 2022-05-23 04:22 92阅读 0赞

# try redis 命令记录 #

try Redis网址 [http://try.redis.io/][http_try.redis.io]  
![这里写图片描述][70]

#### 1. 通过set设值，get取值 ####

> set server:name "fido"
    OK
    > get server:name
    "fido"

#### 2. incr使一个数值加一（保证原子性）、del用于删除key、setnx表示set if not exits，如果不存在时设值 ####

> set connections 10
    OK
    > incr connections
    (integer) 11
    > incr connections
    (integer) 12
    > del connections
    (integer) 1
    > get connections
    (nil)
    > setnx connections 10
    (integer) 1
    > setnx connections 10
    (integer) 0

#### 4. expire设置过期时间，-2表示已经过期 ####

> set resource:lock "redis Demo"
    OK
    > expire resource:lock 20
    (integer) 1
    > ttl resource:lock
    (integer) 9
    > ttl resource:lock
    (integer) 7
    > ttl resource:lock
    (integer) -2

#### 5. -1表示永远不会过期，设置了过期的key重新设值后会冲掉设置的过期时间 ####

> set resource:lock "redis Demo"
    OK
    > expire resource:lock 20
    (integer) 1
    > set resource:lock "redis Demo2"
    OK
    > ttl resource:lock
    (integer) -1
    > get resource:lock
    "redis Demo2"

#### 6. 关于list（列表）的操作：RPUSH, LPUSH, LLEN, LRANGE, LPOP, and RPOP ####

*  rpush 从列表尾插入值
 *  lpush 从列表头插入值
 *  lrange 获取列表子集，参数1表示开始的index，参数2表示结束的index，参数2设为-1表示至结尾

> rpush friends "alice"
    (integer) 1
    > rpush friends "bob"
    (integer) 2
    > lpush friends "sam"
    (integer) 3
    > lrange friends 0 -1
    1) "sam"
    2) "alice"
    3) "bob"
    > lrange friends 0 1
    1) "sam"
    2) "alice"
    > lrange friends 1 2
    1) "alice"
    2) "bob"

*  llen：list 的长度
 *  lpop：从列表头弹出一个元素
 *  rpop：从列表尾弹出一个元素

> llen friends
    (integer) 3
    > lpop friends
    "sam"
    > rpop friends
    "bob"
    > llen friends
    (integer) 1
    > lrange friends 0 -1
    1) "alice"

#### 7. 关于set（集合）的操作：SADD, SREM, SISMEMBER, SMEMBERS and SUNION ####

集合是无序的

*  sadd：set中添加元素
 *  srem：删除set中的元素

> sadd superpower "flight"
    (integer) 1
    > sadd superpower "x-ray vision"
    (integer) 1
    > sadd superpower "reflexes"
    (integer) 1
    > srem superpower "reflexes"
    1

*  SISMEMBER tests if the given value is in the set. It returns 1 if the value is there and 0 if it is not.

> sismember superpower "flight"
    (integer) 1
    > sismember superpower "reflexes"
    (integer) 0

*  SMEMBERS returns a list of all the members of this set.

> smembers superpower
    1) "flight"
    2) "x-ray vision"

*  SUNION combines two or more sets and returns the list of all elements.

> sadd birdpowers pecking
    (integer) 1
    > sadd birdpowers flight
    (integer) 1
    > sunion superpower birdpowers
    1) "pecking"
    2) "flight"
    3) "x-ray vision"

#### 8. 关于sorted set（有序集合）的操作 ####

*  zadd：用于添加有序集合中的元素

> zadd hackers 1940 "Alan Kay"
    (integer) 1
    > zadd hackers 1906 "Grace Hopper"
    (integer) 1
    > zadd hackers 1953 "Richard Stallman"
    (integer) 1
    > zadd hackers 1916 "Clande Shannon"
    (integer) 1
    > ZADD hackers 1969 "Linus Torvalds"
    (integer) 1
    > ZADD hackers 1957 "Sophie Wilson"
    (integer) 1
    > ZADD hackers 1912 "Alan Turing"
    (integer) 1

*  zrange： 取出有序的元素

> zrange hackers 2 4
    1) "Clande Shannon"
    2) "Alan Kay"
    3) "Richard Stallman"

#### 9. 散列类型（hashes） ####

Hashes are maps between string fields and string values, so they are the perfect data type to represent objects (eg: A User with a number of fields like name, surname, age, and so forth):  
\- hset： 哈希类型中设值

> hset user:1000 name "John Smith"
    (integer) 1
    > hset user:1000 email "John-Smith@fukaiit.com"
    (integer) 1
    > hset user:1000 password "dsfsdfdsfsdafadsf"
    (integer) 1

*  hgetall ： 获取哈希类型中所存的值

> hgetall user:1000
    1) "name"
    2) "John Smith"
    3) "email"
    4) "John-Smith@fukaiit.com"
    5) "password"
    6) "dsfsdfdsfsdafadsf"

*  hget：获取单个field的值

> hget user:1000 name
    "John Smith"

*  一次性设置多个字段的值

> hmset user:1001 name "Mary Jones" password "fdsafdsa" email "mjones@fukaiit.com"
    OK
    > hgetall user:1001
    1) "name"
    2) "Mary Jones"
    3) "password"
    4) "fdsafdsa"
    5) "email"
    6) "mjones@fukaiit.com"

*  Numerical values in hash fields are handled exactly the same as in simple strings and there are operations to increment this value in an atomic way.

> hset user:1000 visits 10
    (integer) 1
    > hincrby user:1000 visits 1
    (integer) 11
    > hincrby user:1000 visits 10
    (integer) 21
    > hdel user:1000 visits
    (integer) 1
    > hincrby user:1000 visits 2
    (integer) 2

[http_try.redis.io]: http://try.redis.io/
[70]: /images/20220523/56248b6799c1422eae35ee99ac2baa9d.png