HINCRBY

Syntax

HINCRBY key field increment

Time complexity: O(1)

Increments the number stored at field in the hash stored at key by increment. If key does not exist, a new key holding a hash is created. If field does not exist the value is set to 0 before the operation is performed.

The range of values supported by HINCRBY is limited to 64 bit signed integers.

Return

Integer reply: the value at field after the increment operation.

Examples

Since the increment argument is signed, both increment and decrement operations can be performed:

dragonfly> HSET myhash field 5
(integer) 1
dragonfly> HINCRBY myhash field 1
(integer) 6
dragonfly> HINCRBY myhash field -1
(integer) 5
dragonfly> HINCRBY myhash field -10
(integer) -5