一、简介

Redis提供了丰富的命令对数据库和各种数据类型操作，这些命令可以在Linux终端使用。

二、常用命令讲解

1.keys pattern：返回给定pattern的所有key

127.0.0.1:6379> keys zset*@H_502_12@ 1) "zsetkey"@H_502_12@ 2) "zsetkey1"@H_502_12@ 127.0.0.1:6379> keys set*@H_502_12@ 1) "setkey5"@H_502_12@ 2) "setkey1"@H_502_12@ 3) "setkey3"@H_502_12@ 4) "setkey"@H_502_12@ 5) "setkey2"@H_502_12@ 6) "setkey6"

2.exists key：确认key是否存在。如果存在返回1，如果不存在返回0

127.0.0.1:6379> exists mykey@H_502_12@ (integer) 1@H_502_12@ 127.0.0.1:6379> exists mykey11@H_502_12@ (integer) 0@H_502_12@ 127.0.0.1:6379> keys mykey@H_502_12@ 1) "mykey"@H_502_12@ 127.0.0.1:6379> keys mykey11@H_502_12@ (empty list or set)

3.del key：删除一个键。返回1表示删除成功，返回0表示删除失败

127.0.0.1:6379> del mykey@H_502_12@ (integer) 1@H_502_12@ 127.0.0.1:6379> exists mykey@H_502_12@ (integer) 0

再删除一次

127.0.0.1:6379> del mykey@H_502_12@ (integer) 0

4.expire key：设置一个key的过期时间

127.0.0.1:6379> zrange zsetkey 0 -1 withscores@H_502_12@ 1) "one"@H_502_12@ 2) "1"@H_502_12@ 3) "four"@H_502_12@ 4) "4"

127.0.0.1:6379> ttl zsetkey@H_502_12@ (integer) -1@H_502_12@ 127.0.0.1:6379> expire zsetkey 10@H_502_12@ (integer) 1@H_502_12@ 127.0.0.1:6379> ttl zsetkey@H_502_12@ (integer) 6@H_502_12@ 127.0.0.1:6379> ttl zsetkey@H_502_12@ (integer) 5@H_502_12@ 127.0.0.1:6379> ttl zsetkey@H_502_12@ (integer) 1@H_502_12@ 127.0.0.1:6379> ttl zsetkey@H_502_12@ (integer) -2@H_502_12@ 127.0.0.1:6379> ttl zsetkey@H_502_12@ (integer) -2

127.0.0.1:6379> zrange zsetkey 0 -1 withscores@H_502_12@ (empty list or set)@H_502_12@

-1表示永不过期，-2表示已经过期。我用的时redis2.8.1可能和早期的版本略微有些不同。ttl命令是查看一个键还有多长时间过期。

5.select dbindex：选择dbindex数据库，select 0代表选择当前数据库。数据库一共有16个（0-15个）

127.0.0.1:6379> select 0@H_502_12@ OK@H_502_12@ 127.0.0.1:6379> select 1@H_502_12@ OK@H_502_12@ 127.0.0.1:6379[1]> select 2@H_502_12@ OK@H_502_12@ 127.0.0.1:6379[2]> select 3@H_502_12@ OK

6.move key dbindex：将key从当前数据库移动到dbindex数据库。进入客户端的时候默认进入的是0数据库

127.0.0.1:6379[3]> select 0@H_502_12@ OK@H_502_12@ 127.0.0.1:6379> set age 30@H_502_12@ OK@H_502_12@ 127.0.0.1:6379> get age@H_502_12@ "30"@H_502_12@ 127.0.0.1:6379> move age 1@H_502_12@ (integer) 1@H_502_12@ 127.0.0.1:6379> get age@H_502_12@ (nil)@H_502_12@ 127.0.0.1:6379> select 1@H_502_12@ OK@H_502_12@ 127.0.0.1:6379[1]> get age@H_502_12@ "30"

7.persist key：移除给定key的过期时间

127.0.0.1:6379> ttl age@H_502_12@ (integer) -1@H_502_12@ 127.0.0.1:6379> expire age 200@H_502_12@ (integer) 1@H_502_12@ 127.0.0.1:6379> ttl age@H_502_12@ (integer) 198@H_502_12@ 127.0.0.1:6379> ttl age@H_502_12@ (integer) 194@H_502_12@ 127.0.0.1:6379> persist age@H_502_12@ (integer) 1@H_502_12@ 127.0.0.1:6379> ttl age@H_502_12@ (integer) -1

8.randomkey：随机返回当前数据库中的一个key

127.0.0.1:6379> select 0@H_502_12@ OK@H_502_12@

127.0.0.1:6379> randomkey@H_502_12@ "setkey5"@H_502_12@ 127.0.0.1:6379> randomkey@H_502_12@ "mylist"

9.rename key new_key：把key重命名成new_key

127.0.0.1:6379> get age@H_502_12@ "30"@H_502_12@ 127.0.0.1:6379> rename age new_age@H_502_12@ OK@H_502_12@ 127.0.0.1:6379> get age@H_502_12@ (nil)@H_502_12@ 127.0.0.1:6379> get new_age@H_502_12@ "30"

10.type key：返回key键对应值的数据类型

127.0.0.1:6379> type age@H_502_12@ none@H_502_12@

127.0.0.1:6379> type new_age string 127.0.0.1:6379> type listkey1 list 127.0.0.1:6379> keys hash* 1) "hashkey2" 2) "hashkey1" 127.0.0.1:6379> type hashkey1 hash 127.0.0.1:6379> type setkey1 set 127.0.0.1:6379> type zsetkey1 zset