redis基本数据结构操作:
0.基本的常用key操作和数据库操作:
keys *查看当前库所有key (匹配:keys *1)
127.0.0.1:6379> set username qiuge
OK
127.0.0.1:6379> set age 18
OK
127.0.0.1:6379> keys *
1) "age"
2) "username"
exists key判断某个key是否存在
127.0.0.1:6379> keys *
1) "age"
2) "username"
127.0.0.1:6379> exists username
(integer) 1
127.0.0.1:6379> exists gender
(integer) 0
type key 查看你的key是什么类型
127.0.0.1:6379> type username
string
127.0.0.1:6379> type age
string
del key 删除指定的key数据
127.0.0.1:6379> keys *
1) "age"
2) "username"
127.0.0.1:6379> del username
(integer) 1
127.0.0.1:6379> keys *
1) "age"
unlink key 根据value选择非阻塞删除:仅将keys从keyspace元数据中删除,真正的删除会在后续异步操作。
127.0.0.1:6379> keys *
1) "age"
127.0.0.1:6379> unlink age
(integer) 1
127.0.0.1:6379> keys *
(empty array)
expire key 10 10秒钟:为给定的key设置过期时间
ttl key 查看还有多少秒过期,-1表示永不过期,-2表示已过期
127.0.0.1:6379> keys *
(empty array)
127.0.0.1:6379> set username qiuge
OK
127.0.0.1:6379> ttl username
(integer) -1
127.0.0.1:6379> expire username 10
(integer) 1
127.0.0.1:6379> ttl username
(integer) 6
127.0.0.1:6379> ttl username
(integer) 1
127.0.0.1:6379> ttl username
(integer) -2
127.0.0.1:6379> keys *
(empty array)
127.0.0.1:6379> set username qiuge
OK
127.0.0.1:6379> keys *
1) "username"
127.0.0.1:6379> expire username -1
(integer) 1
127.0.0.1:6379> ttl username
(integer) -2
127.0.0.1:6379> keys *
(empty array)
注意:如果设置为后台启动,数据结构创建的时候默认是永久的,也就是说只要设置了,哪怕中途重启了服务器也还是存在的,使用expire设置时间是秒数,设置时间为-1并不是设置为永久,而是一设置时间过期。
select命令切换数据库
127.0.0.1:6379> flushall
OK
127.0.0.1:6379> keys *
(empty array)
127.0.0.1:6379> select 0
OK
127.0.0.1:6379> keys *
(empty array)
127.0.0.1:6379> set username qiuge
OK
127.0.0.1:6379> keys *
1) "username"
127.0.0.1:6379> select 5
OK
127.0.0.1:6379[5]> keys *
(empty array)
127.0.0.1:6379[5]> set age 19
OK
127.0.0.1:6379[5]> keys *
1) "age"
dbsize查看当前数据库的key的数量
127.0.0.1:6379> keys *
(empty array)
127.0.0.1:6379> dbsize
(integer) 0
127.0.0.1:6379> set username qiuge
OK
127.0.0.1:6379> set age 18
OK
127.0.0.1:6379> keys *
1) "username"
2) "age"
127.0.0.1:6379> dbsize
(integer) 2
flushdb清空当前库
127.0.0.1:6379> select 0
OK
127.0.0.1:6379> keys *
(empty array)
127.0.0.1:6379> set username qiuge
OK
127.0.0.1:6379> keys *
1) "username"
127.0.0.1:6379> select 5
OK
127.0.0.1:6379[5]> keys *
(empty array)
127.0.0.1:6379[5]> set age 19
OK
127.0.0.1:6379[5]> keys *
1) "age"
127.0.0.1:6379[5]> flushdb
OK
127.0.0.1:6379[5]> keys *
(empty array)
127.0.0.1:6379[5]> select 0
OK
127.0.0.1:6379> keys *
1) "username"
flushall通杀全部库
127.0.0.1:6379> select 0
OK
127.0.0.1:6379> keys *
1) "username"
127.0.0.1:6379> select 5
OK
127.0.0.1:6379[5]> keys *
(empty array)
127.0.0.1:6379[5]> set username wangge
OK
127.0.0.1:6379[5]> keys *
1) "username"
127.0.0.1:6379[5]> flushall
OK
127.0.0.1:6379[5]> keys *
(empty array)
127.0.0.1:6379[5]> select 0
OK
127.0.0.1:6379> keys *
(empty array)
标签:username,127.0,keys,0.1,redis,6379,key,基本操作,OK
From: https://www.cnblogs.com/Qiujiacheng/p/16928325.html