redis hincrby命令

HINCRBY key field increment

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.

*返回值

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

*例子

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

redis>  HSET myhash field 5

(integer) 1

redis>  HINCRBY myhash field 1

(integer) 6

redis>  HINCRBY myhash field -1

(integer) 5

redis>  HINCRBY myhash field -10

(integer) -5
redis>