Redis Tutorial

http://try.redis.io/

Redis即Key-Value存储，也称为NoSQL数据库，Redis数据库的关键操作为存储key-value数据，通过key检索value

1）存储、检索、删除，自增值 SET，GET， DEL，INCR

> SET server:name "fido"
OK
> GET server:name
"fido"
> SET connections 10
OK
> INCR connections
(integer) 11
> INCR connections
(integer) 12
> DEL connections
(integer) 1
> INCR connections
(integer) 1

2) key过期 EXPIRE & TTL

#Redis can be told that a key should only exist for a certain length of time. This is accomplished with the EXPIRE and TTL commands.

    SET resource:lock "Redis Demo"
    EXPIRE resource:lock 120

#This causes the key resource:lock to be deleted in 120 seconds. You can test how long a key will exist with the TTL command. It returns the number of seconds until it will be deleted.

    TTL resource:lock => 113
    // after 113s
    TTL resource:lock => -2


#The -2 for the TTL of the key means that the key does not exist (anymore). A -1 for the TTL of the key means that it will never expire. Note that if you SET a key, its TTL will be reset.

    SET resource:lock "Redis Demo 1"
    EXPIRE resource:lock 120
    TTL resource:lock => 119
    SET resource:lock "Redis Demo 2"
    TTL resource:lock => -1

3) 有序列表 RPUSH, LPUSH, LLEN, LRANGE, LPOP, and RPOP

4) 无序集合 SADD, SREM, SISMEMBER, SMEMBERS and SUNION.

5) 有序集合 ZADD ZRANGE

6) 散列 HSET, HGETALL, HMSET, HGET, HDEL

HINCRBY 可以对散列里面的某一域(field)执行自增操作