Redis basic type - hash

Harbin Hash:kv Pattern unchanged . but v It's a key-value pair

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# hset hget The command is used to assign values to fields in the hash table

#  hmset  hmget There will be more than one field-value Set to hash table , The existing fields in the hash table will be overwritten

# hgetall Used to return the data in the hash table All fields and values

# hdel Used to delete hash tables key One or more specified fields in

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127.0.0.1:6379> hset myhash field1 wyt
(integer) 1
127.0.0.1:6379> hget myhash field1
"wyt"
127.0.0.1:6379> hmset myhash field1 lmp field2 hyd
OK
127.0.0.1:6379> hget myhash field1
"lmp"
127.0.0.1:6379> hget myhash field2
"hyd"
127.0.0.1:6379> hgetall myhash
1) "field1"
2) "lmp"
3) "field2"
4) "hyd"
127.0.0.1:6379> hdel myhash field1
(integer) 1
127.0.0.1:6379> hgetall myhash
1) "field2"
2) "hyd"
 

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# hlen  Get the number of fields in the hash table

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127.0.0.1:6379> hlen myhash
(integer) 1
127.0.0.1:6379> hmset myhash field1 wyt field2 lmp
OK
127.0.0.1:6379> hlen myhash
(integer) 2
 

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# hexists  Check whether the specified field of the hash table exists

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127.0.0.1:6379> hexists myhash field1
(integer) 1
127.0.0.1:6379> hexists myhash field3
(integer) 0
 

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# hkeys  Get hash table I All domains in （field）

# hvals Returns all fields of the hash table （field） Value

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127.0.0.1:6379> hkeys myhash
1) "field2"
2) "field1"
127.0.0.1:6379> hvals myhash
1) "lmp"
2) "wyt"
 

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# hincrby  Adds the specified increment value to the field value in the hash table

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127.0.0.1:6379> hset myhash field 5
(integer) 1
127.0.0.1:6379> hincrby myhash field 1
(integer) 6
127.0.0.1:6379> hincrby myhash field -1
(integer) 5
127.0.0.1:6379> hincrby myhash field -10
(integer) -5
 

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# hsetnx  Assign values to fields that do not exist in the hash table

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127.0.0.1:6379> hsetnx myhash field wyt
(integer) 1           # Set up the success return 1
127.0.0.1:6379> hsetnx myhash field wyt
(integer) 0           # If the given field already exists return 0
127.0.0.1:6379> hget myhash field
"wyt"
 

summary ：

Redis hash It's a string Type of fifield and value Mapping table ,hash Ideal for storing objects .

Store partially changed data , Such as user information .