Memcached incr and decr command

Memcached incr and decr command is used to key (key) numeric value already exists will be incrementing or subtraction operation.

Data incr and decr operation of the command must be a decimal 32-bit unsigned integer.

If the key does not exist returnNOT_FOUND, if the value of the key is not a number, the return CLIENT_ERROR,other errors returnERROR.

incr command

grammar:

The basic syntax incr command is as follows:

incr key increment_value

Parameters are as follows:

• key: key key-value structure key, it is used to find the cache value.
• increment_value: increase the value.

Examples

In the following examples, we use visitors as key, an initial value of 10, followed by adding 5 operation.

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

Export

Output information Description:

• NOT_FOUND: key does not exist.
• CLIENT_ERROR: Since the value is not an object.
• ERROR other errors, such as syntax errors.

decr command

The basic syntax decr command is as follows:

decr key decrement_value

Parameters are as follows:

• key: key key-value structure key, it is used to find the cache value.
• decrement_value: reduce value.

Examples

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

In the following examples, we use visitors as key, an initial value of 10, followed by minus 5 operation.

Export

Output information Description:

• NOT_FOUND: key does not exist.
• CLIENT_ERROR: Since the value is not an object.
• ERROR other errors, such as syntax errors.