Hash type of redis

• hset Set up hash type
• hget obtain hash type
• hmset Batch settings hash type
• hmget Batch acquisition hash type
• hgetall Get all the data
• hdel Delete hash Appoint key Field , Corresponding value The value disappears
• hlen obtain hash The number of fields in the table
• hexists Judge hash Specifies whether the field exists
• hkeys Only get all field
• hvals Only get all value
• hincrby Specify incremental increase
• hsetnx If it does not exist, it can be set , If it exists, you cannot set

hash Suitable for storing changed data , Especially user information and so on , Constantly changing information ！hash More suitable for object storage ,String More suitable for string storage .

127.0.0.1:6379> hset myhash field1 zhangsan #set A specific key-value
(integer) 1
127.0.0.1:6379> hget myhash field1 # Get a field value 
"zhangsan"
127.0.0.1:6379> hmset myhash field1 hello field2 world #set Multiple key-value
OK
127.0.0.1:6379> hmget myhash field1 field2  # Get multiple field values 
1) "hello"
2) "world"
127.0.0.1:6379> hgetall myhash  # Get all the data 
1) "field1"
2) "hello"
3) "field2"
4) "world"
127.0.0.1:6379> hdel myhash field1  # Delete hash Appoint key Field , Corresponding value The value disappears 
(integer) 1
127.0.0.1:6379> hgetall myhash
1) "field2"
2) "world"
127.0.0.1:6379> hmset myhash field1 hello field2 world
OK
127.0.0.1:6379> hgetall myhash
1) "field2"
2) "world"
3) "field1"
4) "hello"
127.0.0.1:6379> hlen myhash # obtain hash The number of fields in the table 
(integer) 2
127.0.0.1:6379> hexists myhash field1   # Judge hash Specifies whether the field exists 
(integer) 1
127.0.0.1:6379> hexists myhash field3
(integer) 0
127.0.0.1:6379> hkeys myhash  # Only get all field
1) "field2"
2) "field1"
127.0.0.1:6379> hvals myhash  # Only get all value
1) "world"
2) "hello"
127.0.0.1:6379> hset myhash field3 5
(integer) 1
127.0.0.1:6379> hget myhash field3
"5"
127.0.0.1:6379> hincrby myhash field3 1  # Specify incremental increase 
(integer) 6
127.0.0.1:6379> hincrby myhash field3 -1
(integer) 5
127.0.0.1:6379> hsetnx myhash field4 hello  # If it does not exist, it can be set 
(integer) 1
127.0.0.1:6379> hsetnx myhash field4 world # If it exists, you cannot set 
(integer) 0