redis有序集合
127.0.0.1:6379> zadd orderlist 1 mysql
(integer) 1
127.0.0.1:6379> zadd orderlist 2 redis
(integer) 1
127.0.0.1:6379> zadd orderlist 3 mongodb
(integer) 1
127.0.0.1:6379> zrange orderlist 0 -1
1) "mysql"
2) "redis"
3) "mongodb"
127.0.0.1:6379> zrank orderlist mysql
(integer) 0
127.0.0.1:6379> zrevrank orderlist mysql
(integer) 2
127.0.0.1:6379>
设置过期时间为100秒的key,它的值是value
setex key 100 value
如果指定的key不存在那么设置key的值是value
setnx key value
队列和栈
队列先进先出 rpush lpop
栈先进后出 rpush rpop
集合
> sadd books python
(integer) 1
> sadd books python # 重复
(integer) 0
> sadd books java golang
(integer) 2
> smembers books # 注意顺序，和插入的并不一致，因为 set 是无序的
1) "java"
2) "python"
3) "golang"
> sismember books java # 查询某个 value 是否存在，相当于 contains(o)
(integer) 1
> sismember books rust
(integer) 0
> scard books # 获取长度相当于 count()
(integer) 3
> spop books # 弹出一个
"java"...
查看key的类型type
type books
redis锁
#!/bin/bash
/usr/bin/redis-cli set lock:codehole true ex 100 nx
echo "hello"
/usr/bin/redis-cli del lock:codehole
