Get to know the data structure of redis - hash

Redis Five data types commonly used in ：
1、 character string （String）
2、 String list （List）
3、 Ordered string collection （Sorted list）
4、 Hash （Hash）
5、 String collection （Set）

One 、 Store hash （Hash） Common commands
a. assignment hset/hmset
b, Value hget/hmget/hgetall
c. Delete hdel
d. add number hincrby
e. Self study order hexists/hlen/hkeys/hvals

127.0.0.1:6379> hset myhash username hwm
(integer) 1
127.0.0.1:6379> hset muhash age 18
(integer) 1
127.0.0.1:6379> hmset muhash2 username zwy  age 21
OK
127.0.0.1:6379> hget myhash username
"hwm"
127.0.0.1:6379> hmget myhash username age
1) "hwm"
2) "12"
127.0.0.1:6379> hgetall myhash
1) "username"
2) "hwm"
3) "age"
4) "12"
127.0.0.1:6379> hdel muhash2 username age
(integer) 2
127.0.0.1:6379> hgetall muhash2
(empty array)
127.0.0.1:6379> hset myhash2 username hwm
(integer) 1
127.0.0.1:6379> del myhash2
(integer) 1
127.0.0.1:6379> hget myhash2 username
(nil)
127.0.0.1:6379> hget myhash age
"12"
127.0.0.1:6379> hincrby myhash age 5
(integer) 17
127.0.0.1:6379> hget myhash age
"17"
127.0.0.1:6379> hgetall myhash
1) "username"
2) "hwm"
3) "age"
4) "17"
127.0.0.1:6379> hexists myhash age
(integer) 1
127.0.0.1:6379> hlen myhash
(integer) 2
127.0.0.1:6379> hkeys myhash
1) "username"
2) "age"
127.0.0.1:6379> hvals myhash
1) "hwm"
2) "17"
127.0.0.1:6379>