HDEL
格式：HDEL key field [field ...]
Role: Delete one or more fields in the hash table.
Return value: The number of deleted domains.
HEXISTS
格式：HEXISTS key field
Function: Determine whether the hash table contains a field field.
Return value: return 1 if it is included, return 0 if it is not included.
HGET
Format: HGET key field
Role: Returns the value of the field field in the hash table
Return value: The value of the field field. Returns nil if the field does not exist, or if the hash table does not exist.
HGETALL
Format: HGETALL key
Function: Returns all fields and values in the hash table key.
Return value: Field and value in list form.
Example:
192.168.1.100:6379> hset testkey a 1
(integer) 1
192.168.1.100:6379> hset testkey b 2
(integer) 1
192.168.1.100:6379> hgetall testkey
1) "a"
2) "1"
3) "b"
4) "2"
HINCRBY
格式：HINCRBY key field increment
Function: Increment the field field in the hash table key. If the hash table does not exist, it is created. If the field does not exist, it is created and initialized to 0, and the operation is performed.
Return value: The value of the field after the operation.
HINCRBYFLOAT
格式：HINCRBYFLOAT key field increment
Role: Similar to HINCRBY, but the number of operations is a floating-point number.
Return value: The value of the field after the operation.
HKEYS
Format: HKEYS key
Function: Returns all fields in the hash table key.
Return value: All fields in key. Returns an empty list if key does not exist.
Example:
192.168.1.100:6379> hset testkey a 1
(integer) 1
192.168.1.100:6379> hset testkey b 2
(integer) 1
192.168.1.100:6379> hkeys testkey
1) "a"
2) "b"
HLEN
Format: HLEN key
Function: Returns the number of fields in the hash table key.
Return value: the number of domains, or 0 if the key does not exist.
HMGET
Format: HMGET key field [field ...]
Function: Returns the values of multiple fields in the hash table.
Return value: the values of multiple fields. If the field does not exist, the return value is nil. If the key does not exist, the returned list is all nil.
Example:
192.168.1.100:6379> hmget testkey abc
1) "1"
2) "2"
3) (nil)
192.168.1.100:6379> hmget testkey100 a b c
1) (nil)
2) (nil)
3) (nil)
HMSET
格式：HMSET key field value [field value ...]
Role: Set the value of multiple fields in the hash table key.
Return value: return OK on success
HSET
Format: HSET key field value
Role: Set the value of the field field in the hash table key.
Return value: If the field does not exist, it will return 1 if the setting is successful, and if the field exists, it will return 0 if the setting is successful.
HSETNX
Format: HSETNX key field value
Function: When the field field does not exist in the hash table, create the field field and set the value to value. If the field field already exists, no action is performed.
Return value: set successfully, return 1, otherwise return 0
WHALE
Format: HVALS key
Function: Returns the values of all fields in the hash table key.
Return value: The value of all fields. If the key does not exist, return an empty table.
Original address: http://caiguoqing.org/post/105