• Redis数据结构之哈希
  • 写入
  • 获取数据
  • 修改数据
  • 删除数据
  • 删除所有数据
  • 查看key中指定的field是否存在
  • 若value中没有相应的field ,则创建
  • 获取多个值
  • 获取所有的key和value
  • 获取所有的key
  • 获取所有的value
  • 计数
    • 增加
    • 减少
    • 小数点
  • 获取长度
  • 获取某个字段的长度
  • 设置过期时间

Redis数据结构之哈希

哈希类型是指键值对里的value本身存储的也是一个个的KV键值对，类似于python中的dict和java中的map集合。

写入

HSET

127.0.0.1:6379> HSET people name df sex null add diqiu
3

获取数据

HGET

127.0.0.1:6379> HGET people sex
null
127.0.0.1:6379> HGET people name
df
127.0.0.1:6379> HGET people add
diqiu

修改数据

HSET

127.0.0.1:6379> HSET people sex man
0
127.0.0.1:6379> HGET people sex
man

删除数据

HDEL

127.0.0.1:6379> HDEL people sex
1
127.0.0.1:6379> HGET people name
df
127.0.0.1:6379> HGET people sex

127.0.0.1:6379> HGET people add
diqiu

删除所有数据

DEL

127.0.0.1:6379> DEL people
1
127.0.0.1:6379> hget people name

127.0.0.1:6379> HGET people add

查看key中指定的field是否存在

HEXISTS

127.0.0.1:6379> HSET people name df sex null add diqiu
3
127.0.0.1:6379> HEXISTS people name
1
127.0.0.1:6379> HEXISTS people high
0

若value中没有相应的field ,则创建

HSETNX

127.0.0.1:6379> HGET people name
df
127.0.0.1:6379> HSETNX people name ffgg
0
127.0.0.1:6379> HGET people name
df
127.0.0.1:6379> HGET people high

127.0.0.1:6379> HSETNX people high 180
1
127.0.0.1:6379> HGET people high
180

获取多个值

HMGET

127.0.0.1:6379> HSET people name df sex null add huoxing
3
127.0.0.1:6379> HMGET people name sex add
df
null
huoxing

获取所有的key和value

HGETALL

127.0.0.1:6379> HGETALL people
name
df
sex
null
add
huoxing

获取所有的key

HKEYS

127.0.0.1:6379> HKEYS people
name
sex
add

获取所有的value

HVALS

127.0.0.1:6379> HVALS people
df
null
huoxing

计数

增加

HINCRBY

127.0.0.1:6379> HGET people id
1
127.0.0.1:6379> HINCRBY people id 1
2
127.0.0.1:6379> HINCRBY people id 1
3
127.0.0.1:6379> HINCRBY people id 1
4

减少

HINCRBY

127.0.0.1:6379> HGET people id
4
127.0.0.1:6379> HINCRBY people id -1
3
127.0.0.1:6379> HINCRBY people id -1
2
127.0.0.1:6379> HINCRBY people id -1
1

小数点

HINCRBYFLOAT

127.0.0.1:6379> HGET people id
1
127.0.0.1:6379> HINCRBYFLOAT people id 0.7
1.7
127.0.0.1:6379> HINCRBYFLOAT people id 0.7
2.4
127.0.0.1:6379> HINCRBYFLOAT people id 0.7
3.1
... ...
127.0.0.1:6379> HINCRBYFLOAT people id 10.9
128.57779999999999999			#处理精度不足

获取长度

HLEN

127.0.0.1:6379> HLEN people
4
#此时people有4对key value

获取某个字段的长度

HSTRLEN

127.0.0.1:6379> HGET people name
df
127.0.0.1:6379> HSTRLEN people name
2

设置过期时间

EXPIRE

#设置为10s后过期
127.0.0.1:6379> EXPIRE people 10
1
#此时查看发现已经过期
127.0.0.1:6379> TTL people
-2
#过期后再查看，无内容
127.0.0.1:6379> HGETALL people