Redis Note8:Redis-Key—Hash

1. Hash

1.1 设置和获取值：hset 、hget

127.0.0.1:6379> hset myhash field1 henggao
(integer) 1
127.0.0.1:6379> hget myhash field1
"henggao"

1.2 设置和获取多个字段：hmset 、hmget

127.0.0.1:6379> hmset myhash field1 hello field2 world
OK
127.0.0.1:6379> hmget myhash field1 field2
1) "hello"
2) "world"

1.3 获取全部的数据：hgetall

127.0.0.1:6379> hgetall myhash
1) "field1"
2) "hello"
3) "field2"
4) "world"

1.4 删除指定的字段：hdel

# 删除指定的字段，对应的value值也就删除了
127.0.0.1:6379> hdel myhash field1
(integer) 1
127.0.0.1:6379> hgetall myhash
1) "field2"
2) "world"

1.5 获取hash表的数量：hlen

127.0.0.1:6379> hlen myhash
(integer) 2

1.6 判断字段是否存在：HEXISTS

127.0.0.1:6379> HEXISTS myhash field1
(integer) 1

1.7 只获取field、value：HKEYS 、HVALS

127.0.0.1:6379> HKEYS myhash
1) "field2"
2) "field1"
127.0.0.1:6379> HVALS myhash
1) "world"
2) "hello"

1.8 指定增减量：HINCRBY

127.0.0.1:6379> hset myhash field3 3
(integer) 1
127.0.0.1:6379> HINCRBY myhash field3 2
(integer) 5
127.0.0.1:6379> HINCRBY myhash field3 -1
(integer) 4

1.9 不存在设置：hsetnx

# 如果不存在可以设置
127.0.0.1:6379> hsetnx myhash field4 hello
(integer) 1
# 如果存在不可以设置
127.0.0.1:6379> hsetnx myhash field4 world
(integer) 0

总结