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