Redis hashes存储的操作方法

32饿312

上篇我们讲到string的操作方法，其实hashes与其类似，只不过命令格式不同而已。

使用redis-cli进入redis：

1 2	[iyunv@web1 ~]# redis-cli 127.0.0.1:6379>

1、添加
a>hset
方法：hset key filed value
描述：与set一样，不存在增加，否则更新返回1表示新的filed，0表示filed已存在并用new value覆盖old value

1 2 3 4 5 6 7 8

127.0.0.1:6379> hset user:0001 name Sunshine (integer) 1 127.0.0.1:6379> hget user:0001 name "Sunshine" 127.0.0.1:6379> hset user:0001 name SunshineBoy (integer) 0 127.0.0.1:6379> hget user:0001 name "SunshineBoy"

b>hsetnx

方法：hsetnx key filed value
描述：与setnx一样，filed为指定value，如果key不存在先创建，否则返回0

1 2 3 4 5 6 7 8

127.0.0.1:6379> hsetnx user:0002 name Sunshineone (integer) 1 127.0.0.1:6379> hget user:0002 name "Sunshineone" 127.0.0.1:6379> hsetnx user:0002 name Sunshinetwo (integer) 0 127.0.0.1:6379> hget user:0002 name "Sunshineone"

c>hmset
方法：hmset key filed value [key filed value...]
描述：与mset一样，成功返回OK，如果filed存在就更新

1 2 3 4 5 6 7

127.0.0.1:6379> hmset user:003 name Sunshine age 25 OK 127.0.0.1:6379> hmset user:003 name Sunshine age 23 OK 127.0.0.1:6379> hmget user:003 name age 1) "Sunshine" 2) "23"

2、查看
a>hget
方法：hget key filed
描述：与get一样，查看key的filed的value

1 2	127.0.0.1:6379> hget user:0002 name "Sunshineone"

b>hmget
方法：hmget key filed [filed2...]

1 2 3 4 5

127.0.0.1:6379> hmget user:003 name 1) "Sunshine" 127.0.0.1:6379> hmget user:003 name age 1) "Sunshine" 2) "23"

d>hlen

方法: hlen key

描述：查看key有多个filed

1 2 3 4 5 6 7 8 9

127.0.0.1:6379> hkeys user:003 1) "name" 2) "age" 127.0.0.1:6379> hlen user:003 (integer) 2 127.0.0.1:6379> hkeys user:0001 1) "name" 127.0.0.1:6379> hlen user:0001 (integer) 1

e>hkeys

方法：hkey key
描述：查看并显示key的filedname

1 2 3 4 5 6 7 8 9

127.0.0.1:6379> hkeys user:0001 1) "name" 127.0.0.1:6379> hkeys user:0002 1) "name" 127.0.0.1:6379> hkeys user:003 1) "name" 2) "age" 127.0.0.1:6379> hkeys key:1 1) "value"

f>hvals
方法：hvals key
描述：插卡并电视key的filed值

1 2 3 4 5 6 7 8 9

127.0.0.1:6379> hvals user:0001 1) "SunshineBoy" 127.0.0.1:6379> hvals user:0002 1) "Sunshineone" 127.0.0.1:6379> hvals user:003 1) "Sunshine" 2) "23" 127.0.0.1:6379> hvals key:1 1) "20"

g>hgetall

方法：hgetall key
描述：查看并显示key的filedname及filedvalue

1 2 3 4 5 6 7 8 9 10 11 12 13 14

127.0.0.1:6379> hgetall user:0001 1) "name" 2) "SunshineBoy" 127.0.0.1:6379> hgetall user:0002 1) "name" 2) "Sunshineone" 127.0.0.1:6379> hgetall user:003 1) "name" 2) "Sunshine" 3) "age" 4) "23" 127.0.0.1:6379> hgetall key:1 1) "value" 2) "20"

3、修改
a>hincry
方法：方法与incrby一样，hashes没有递增递减

1 2 3 4 5 6 7 8 9 10 11 12

127.0.0.1:6379> hset key:1 value 20 (integer) 1 127.0.0.1:6379> hget key:1 value "20" 127.0.0.1:6379> hincrby key:1 value 10 (integer) 30 127.0.0.1:6379> hget key:1 value "30" 127.0.0.1:6379> hincrby key:1 value -10 (integer) 20 127.0.0.1:6379> hget key:1 value "20"

b>hincrbyfloat
方法：hincrbyfloat key filed incr_by_number
描述：用于浮点数，如果存在则递增递减，否则初始化值为0并设定当前值，下面为官方解释

Redis Hincrbyfloat 命令用于为哈希表中的字段值加上指定浮点数增量值。

如果指定的字段不存在，那么在执行命令前，字段的值被初始化为 0 。

1 2 3 4 5 6 7 8 9 10 11 12

127.0.0.1:6379> hincrbyfloat key:2 value 2.6 "2.6" 127.0.0.1:6379> hget key:2 value "2.6" 127.0.0.1:6379> hincrbyfloat key:2 value 1.3 "3.9" 127.0.0.1:6379> hget key:2 value "3.9" 127.0.0.1:6379> hincrbyfloat key:2 value -1.3 "2.6" 127.0.0.1:6379> hget key:2 value "2.6"

4、测试
a>hexists

方法：hexists key filed
描述：如果存在返回1，否则返回0

1 2 3 4 5 6

127.0.0.1:6379> hexists key:1 value1 (integer) 0 127.0.0.1:6379> hexists key:2 value (integer) 0 127.0.0.1:6379> hexists key:1 value (integer) 1

至此Redis Heashes就介绍完毕啦