Redis常见命令-客户端，服务器--实例解析

╰半橙微兮° 2022-07-19 05:58 253阅读 0赞

**把之前学习的Redis做一个总结，好记性不如烂笔头。**

**命令主要有：**

客户端常用命令**keys、exists、del、expire、move、persist、randomkey、rename、type**

服务器端常用命令**ping、echo、select、quit、dbsize、info、monitor、config get、flushdb 、flushall**

1、keys

支持通配符

127.0.0.1:6379> keys *
    1) "user:1"
    2) "test2"
    3) "ming"
    4) "cai"
    5) "myname"
    6) "t1"
    7) "test:1"
    8) "foo"
    9) "test"

127.0.0.1:6379> keys m*
    1) "ming"
    2) "myname"

2、exists

127.0.0.1:6379> exists ming
    (integer) 1
    127.0.0.1:6379> exists min
    (integer) 0

3、del

127.0.0.1:6379> del ming
    (integer) 1
    127.0.0.1:6379> keys *
    1) "user:1"
    2) "test2"
    3) "cai"
    4) "myname"
    5) "t1"
    6) "test:1"
    7) "foo"
    8) "test"

4、expire

下面设置key cai的有效时长为10秒，用ttl cai 来不断检查是否有效，为负数无效

127.0.0.1:6379> expire cai 10
    (integer) 1
    127.0.0.1:6379> ttl cai
    (integer) 7
    127.0.0.1:6379> ttl cai
    (integer) 4
    127.0.0.1:6379> ttl cai
    (integer) 2
    127.0.0.1:6379> ttl cai
    (integer) 1
    127.0.0.1:6379> ttl cai
    (integer) -2
    127.0.0.1:6379> ttl cai
    (integer) -2
    127.0.0.1:6379> ttl cai
    (integer) -2

此时keys没有了cai

127.0.0.1:6379> keys *
    1) "user:1"
    2) "test2"
    3) "myname"
    4) "t1"
    5) "test:1"
    6) "foo"
    7) "test"

5、move

从一个位置，一个数据库移动到另一个

具体下面演示一个key--name从默认数据库0移动到数据库1的过程

127.0.0.1:6379> select 0
    OK
    127.0.0.1:6379> keys *
    1) "user:1"
    2) "test2"
    3) "myname"
    4) "t1"
    5) "test:1"
    6) "foo"
    7) "test"
    127.0.0.1:6379> set name jack
    OK
    127.0.0.1:6379> get name
    "jack"
    127.0.0.1:6379> move name 1
    (integer) 1
    127.0.0.1:6379> get name
    (nil)
    127.0.0.1:6379> select 1
    OK
    127.0.0.1:6379[1]> get name
    "jack"
    127.0.0.1:6379[1]> keys *
    1) "name"

6、persist

将相关key直接设置为过期

如下将key--test直接设置为过期，返回负数

127.0.0.1:6379[1]> select 0
    OK
    127.0.0.1:6379> keys *
    1) "user:1"
    2) "test2"
    3) "myname"
    4) "t1"
    5) "test:1"
    6) "foo"
    7) "test"
    127.0.0.1:6379> expire test 200
    (integer) 1
    127.0.0.1:6379> ttl test
    (integer) 194
    127.0.0.1:6379> ttl test
    (integer) 192
    127.0.0.1:6379> ttl test
    (integer) 191
    127.0.0.1:6379> persist test
    (integer) 1
    127.0.0.1:6379> ttl test
    (integer) -1
    127.0.0.1:6379> ttl test
    (integer) -1

7、randomkey

随机产生一个key,从key集合里

127.0.0.1:6379> select 0
    OK
    127.0.0.1:6379> keys *
    1) "user:1"
    2) "test2"
    3) "myname"
    4) "t1"
    5) "test:1"
    6) "foo"
    7) "test"
    127.0.0.1:6379> randomkey
    "user:1"
    127.0.0.1:6379> randomkey
    "test:1"
    127.0.0.1:6379> randomkey
    "test2"

8、rename

如其名，重命名key

127.0.0.1:6379> keys *
    1) "user:1"
    2) "test2"
    3) "myname"
    4) "t1"
    5) "test:1"
    6) "foo"
    7) "test"
    127.0.0.1:6379> rename test hello
    OK
    127.0.0.1:6379> keys *
    1) "user:1"
    2) "test2"
    3) "hello"
    4) "myname"
    5) "t1"
    6) "test:1"
    7) "foo"

9、type

返回key的数据类型，string、set、hash、sortSet、list

127.0.0.1:6379> keys *
    1) "user:1"
    2) "test2"
    3) "hello"
    4) "myname"
    5) "t1"
    6) "test:1"
    7) "foo"
    127.0.0.1:6379> type foo
    string
    127.0.0.1:6379> type user:1
    hash
    127.0.0.1:6379> type hello
    list
    127.0.0.1:6379> type myname
    string
    127.0.0.1:6379> type t1
    set

服务器端的命令比较简单汇总一起如下

127.0.0.1:6379> ping
    PONG
    127.0.0.1:6379> echo "hello world"
    "hello world"
    127.0.0.1:6379> select 0
    OK
    127.0.0.1:6379> dbsize
    (integer) 7
    127.0.0.1:6379> keys *
    1) "user:1"
    2) "test2"
    3) "hello"
    4) "myname"
    5) "t1"
    6) "test:1"
    7) "foo"
    127.0.0.1:6379> info
    # Server
    redis_version:2.8.17
    redis_git_sha1:00000000
    redis_git_dirty:0
    redis_build_id:a42b2411a03997f5
    redis_mode:standalone
    os:Linux 3.10.0-123.el7.x86_64 x86_64
    arch_bits:64
    multiplexing_api:epoll
    gcc_version:4.8.5
    process_id:22860
    run_id:7f801ab537dea32dc2b982c15517e4d21edf637d
    tcp_port:6379
    uptime_in_seconds:23312
    uptime_in_days:0
    hz:10
    lru_clock:11216944
    config_file:
    
    # Clients
    connected_clients:1
    client_longest_output_list:0
    client_biggest_input_buf:0
    blocked_clients:0
    
    # Memory
    used_memory:810976
    used_memory_human:791.97K
    used_memory_rss:8400896
    used_memory_peak:811480
    used_memory_peak_human:792.46K
    used_memory_lua:33792
    mem_fragmentation_ratio:10.36
    mem_allocator:jemalloc-3.6.0
    
    # Persistence
    loading:0
    rdb_changes_since_last_save:7
    rdb_bgsave_in_progress:0
    rdb_last_save_time:1470833212
    rdb_last_bgsave_status:ok
    rdb_last_bgsave_time_sec:0
    rdb_current_bgsave_time_sec:-1
    aof_enabled:0
    aof_rewrite_in_progress:0
    aof_rewrite_scheduled:0
    aof_last_rewrite_time_sec:-1
    aof_current_rewrite_time_sec:-1
    aof_last_bgrewrite_status:ok
    aof_last_write_status:ok
    
    # Stats
    total_connections_received:10
    total_commands_processed:269
    instantaneous_ops_per_sec:0
    rejected_connections:0
    sync_full:0
    sync_partial_ok:0
    sync_partial_err:0
    expired_keys:1
    evicted_keys:0
    keyspace_hits:164
    keyspace_misses:7
    pubsub_channels:0
    pubsub_patterns:0
    latest_fork_usec:2097
    
    # Replication
    role:master
    connected_slaves:0
    master_repl_offset:0
    repl_backlog_active:0
    repl_backlog_size:1048576
    repl_backlog_first_byte_offset:0
    repl_backlog_histlen:0
    
    # CPU
    used_cpu_sys:15.34
    used_cpu_user:6.29
    used_cpu_sys_children:0.01
    used_cpu_user_children:0.00
    
    # Keyspace
    db0:keys=7,expires=0,avg_ttl=0
    db1:keys=1,expires=0,avg_ttl=0
    127.0.0.1:6379>