十九、键值和服务器命令
127.0.0.1:6379> keys * #列出所有键值
1) "key3"
2) "seta"
3) "hash1"
4) "list1"
5) "key2"
6) "zset1"
7) "mset2"
8) "set2"
9) "set1"
10) "key1"
11) "hash2"
12) "set3"
127.0.0.1:6379> keys key* //模糊匹配
1) "key3"
2) "key2"
3) "key1"
127.0.0.1:6379> EXISTS list1 #查看是否有list1
(integer) 1
127.0.0.1:6379> del key1 #删除key1
(integer) 1
127.0.0.1:6379> EXISTS key1
(integer) 0
127.0.0.1:6379> EXPIRE key3 10 #设置过期时间
(integer) 1
127.0.0.1:6379> get key3
"3"
127.0.0.1:6379> ttl key3 #查看key的过期时间，-1不存在过期 -2不存储键值
(integer) -2
127.0.0.1:6379> EXists key3
(integer) 0
127.0.0.1:6379> select 0 #切换库，默认16个库
OK
127.0.0.1:6379> select 1
OK
127.0.0.1:6379[1]> set key1 111 #新建一个键值
OK
127.0.0.1:6379[1]> keys *
1) "key1"
127.0.0.1:6379[1]> move set1 2 #移动到库2
(integer) 0
127.0.0.1:6379[1]> select 2 #切换库2
OK
127.0.0.1:6379[2]> keys *
1) "key1"
127.0.0.1:6379[2]> EXPIRE key1 200 #设置过期时间
(integer) 1
127.0.0.1:6379[2]> ttl key1
(integer) 193
127.0.0.1:6379[2]> PERSIST key1 #取消过期时间
(integer) 1
127.0.0.1:6379[2]> ttl key1
(integer) -1
127.0.0.1:6379[2]> RANDOMKEY #随机返回一个key
"key1"
127.0.0.1:6379[2]> RENAME key1 szk #更改一个key的名字
OK
127.0.0.1:6379[2]> keys *
1) "szk"
127.0.0.1:6379[2]> type szk #查看一个键值的类型
string