HINCRBY

Syntax

1. HINCRBY key field increment

Time complexity: O(1)

ACL categories: @write, @hash, @fast

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:

1. dragonfly> HSET myhash field 5
2. (integer) 1
3. dragonfly> HINCRBY myhash field 1
4. (integer) 6
5. dragonfly> HINCRBY myhash field -1
6. (integer) 5
7. dragonfly> HINCRBY myhash field -10
8. (integer) -5