Redis之hash

Redis 哈希(Hash)
hash的格式也是键值对key:map，只不过他的值是map集合。
key:{key:vlaue}

案例

127.0.0.1:6379> HSET myhash field1 lili                       #set一个具体的key-value 
(integer) 1
127.0.0.1:6379> HGET myhash field1
"lili"
127.0.0.1:6379> HSET myhash field1 hello field2 world         #set多个的key-value 
(integer) 1
127.0.0.1:6379> hmget myhash field1 field2                    #获取多个字段值
1) "hello"
2) "world"

127.0.0.1:6379> HGETALL myhash                                #获取hash中全部的值
1) "field1"
2) "hello"
3) "field2"
4) "world"

127.0.0.1:6379> HDEL myhash field1                            #删除hash指定key字段，同时对应的value也会删除
(integer) 1
127.0.0.1:6379> HGETALL myhash
1) "field2"
2) "world"

• hlen

127.0.0.1:6379> HGETALL myhash
1) "field2"
2) "world"
3) "field1"
4) "hello"
127.0.0.1:6379> HLEN myhash                                  #获取hash表的字段数量
(integer) 2
127.0.0.1:6379>

• HEXISTS

127.0.0.1:6379> HEXISTS myhash field1                        #判断hash中的指定字段是否存在
(integer) 1
127.0.0.1:6379> HEXISTS myhash field3
(integer) 0

• hkeys&hvals

127.0.0.1:6379> hkeys myhash                                #只获取所有的字段
1) "field2"
2) "field1"

127.0.0.1:6379> hvals myhash                                #只获取所有的值
1) "world"
2) "hello"

• hincrby

127.0.0.1:6379> HSET myhash field3 5                        #指定自增长
(integer) 1
127.0.0.1:6379> hincrby myhash field3 1
(integer) 6
127.0.0.1:6379> hincrby myhash field3 -1
(integer) 5
127.0.0.1:6379> hsetnx myhash field4 hello                  #如果不存在则可以设置
(integer) 1
127.0.0.1:6379> hsetnx myhash field4 world                  #如果存在则不可以设置
(integer) 0

127.0.0.1:6379> HSET user:1 name lili
(integer) 1
127.0.0.1:6379> HGET user:1 name
"lili"