1.7. Memcached replace command

1.7.1. Syntax: ¶

The replace basic syntax format of the command is as follows:

replace key flags exptime bytes [noreply] value 

The parameters are described as follows:

• key :Key value key-value in the structure key used to find cached values

• flags :Can include integer parameters for key-value pairs, which clients use to store additional information about key-value pairs

• exptime :Length of time to save key-value pairs in the cache (in seconds,0 means forever)

• bytes :Number of bytes stored in the cache

• noreply (optional): this parameter tells the server that there is no need to return data

• value :The stored value (always in the second line) (which can be directly understood as key-value in the structure value )

1.7.2. Example ¶

In the following example, we set:

• Key → mykey

• Flag → 0

• Exptime → 900 (in seconds)

• Bytes → 10 (bytes of data storage)

• Value → data_value

In the following example, we use the key ‘mykey’’ and store the corresponding value data_value . After execution, we replace the same key the value of is ‘some_other_value’ .

add mykey 0 900 10 data_value STORED get mykey VALUE mykey 0 10 data_value END replace mykey 0 900 16 some_other_value get mykey VALUE mykey 0 16 some_other_value END 

1.7.3. Output ¶

If the data is added successfully, the output:

STORED 

Output information description:

• STORED :Output after being saved successfully

• NOT_STORED :Output after failed to perform replacement