Memcached incr and
decr
command is used for existing
key
the numeric value of (key) is used for self-increasing or self-decreasing operation.
incr
and
decr
the data for the command operation must be a decimal 32-bit unsigned integer.
If The The parameters are described as follows: In the following example, we use the Output information description: The The parameters are described as follows: In the following example, we use the Output information description:
key
has no return
NOT_FOUND
, the value of the key is nota number, returns
CLIENT_ERROR
other errors are returned
ERROR
. 1.14.1.
incr
command ¶ Syntax: ¶
incr
basic syntax format of the command is as follows:incr key increment_value
key
:Key value
key-value
in the structure
key
used to find cached values
increment_value
:The increased number. 1.14.2. Example ¶
visitors
as
key
the initial value is 10, and then add 5.set visitors 0 900 2
10
STORED
get visitors
VALUE visitors 0 2
10
END
incr visitors 5
15
get visitors
VALUE visitors 0 2
15
END
1.14.3. Output ¶
NOT_FOUND
:
key
doesn’t exist.
CLIENT_ERROR
:Self-increment is not an object.
ERROR
other errors, such as grammatical errors. 1.14.4.
decr
command ¶
decr
basic syntax format of the command is as follows:decr key decrement_value
key
:Key value
key-value
in the structure
key
used to find cached values
decrement_value
:The reduced number.Example ¶
set visitors 0 900 2
10
STORED
get visitors
VALUE visitors 0 2
10
END
decr visitors 5
5
get visitors
VALUE visitors 0 1
5
END
visitors
as
key
with an initial value of 10, followed by minus 5 1.14.5. Output ¶
NOT_FOUND
:
key
doesn’t exist.
CLIENT_ERROR
:Self-increment is not an object.
ERROR
other errors, such as grammatical errors.