Redis系列-key相关主要操作函数 .
这篇blog主要总结下，redis中跟key相关的常用函数

1）keys

语法：keys pattern

解释：查找所有匹配指定模式pattern的key

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01.[root@xsf001 ~]# redis-cli  
02.redis 127.0.0.1:6379> keys *  #所有key 
03. 1) "score" 
04. 2) "stu" 
05. 3) "score1" 
06. 4) "dest" 
07. 5) "lst.user" 
08. 6) "lst.tect" 
09.redis 127.0.0.1:6379> keys scor?  
10.1) "score" 
11.redis 127.0.0.1:6379> keys scor[ee1] 
12.1) "score" 
[root@xsf001 ~]# redis-cli
redis 127.0.0.1:6379> keys *  #所有key
 1) "score"
 2) "stu"
 3) "score1"
 4) "dest"
 5) "lst.user"
 6) "lst.tect"
redis 127.0.0.1:6379> keys scor?
1) "score"
redis 127.0.0.1:6379> keys scor[ee1]毕业论文 
1) "score" 2)randomkey

语法：randomkey

解释：返回一个随机key

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01.redis 127.0.0.1:6379> randomkey 
02."score" 
03.redis 127.0.0.1:6379> randomkey 
04."list.user" 
redis 127.0.0.1:6379> randomkey
"score"
redis 127.0.0.1:6379> randomkey
"list.user"
3）exists

语法：exists key

解释：判断一个key是否存在

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01.redis 127.0.0.1:6379> exists score  #key存在 返回1 
02.(integer) 1 
03.redis 127.0.0.1:6379> exists scorefda #key不存在 返回0 
04.(integer) 0 
redis 127.0.0.1:6379> exists score  #key存在 返回1
(integer) 1
redis 127.0.0.1:6379> exists scorefda #key不存在 返回0
(integer) 0 4）type

语法：type key

解释：返回key所存储的值类型，返回值：none【key不存在】，string，list ，set， zset和hash

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01.redis 127.0.0.1:6379> type score 
02.zset 
03.redis 127.0.0.1:6379> type lst.user 
04.list 
redis 127.0.0.1:6379> type score
zset
redis 127.0.0.1:6379> type lst.user
list
5）expire

语法：expire key seconds

解释：设置key的生存时间，单位是秒，当key过期时，会被自动删除

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01.redis 127.0.0.1:6379> expire dest 30 
02.(integer) 1 
03.redis 127.0.0.1:6379> expire dest1 30 # key不存在 
04.(integer) 0 
redis 127.0.0.1:6379> expire dest 30
(integer) 1
redis 127.0.0.1:6379> expire dest1 30 # key不存在
(integer) 0
6）ttl

语法： ttl key

解释：得到key能存活时间，如果key不存在或没有设置生存时间时，返回-1

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01.redis 127.0.0.1:6379> expire diff 100 
02.(integer) 1 
03.redis 127.0.0.1:6379> ttl diff 
04.(integer) 94 
05.redis 127.0.0.1:6379> ttl diff 
06.(integer) 92 
redis 127.0.0.1:6379> expire diff 100
(integer) 1
redis 127.0.0.1:6379> ttl diff
(integer) 94
redis 127.0.0.1:6379> ttl diff
(integer) 92 7）persist

语法：persist key

解释：移除给定key的生存时间

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01.redis 127.0.0.1:6379> ttl diff 
02.(integer) 28 
03.redis 127.0.0.1:6379> persist diff 
04.(integer) 1 
05.redis 127.0.0.1:6379> ttl diff 
06.(integer) -1 
redis 127.0.0.1:6379> ttl diff
(integer) 28
redis 127.0.0.1:6379> persist diff
(integer) 1
redis 127.0.0.1:6379> ttl diff
(integer) -1
8）rename

语法：rename key newkey

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