1.8. Memcached append command

1.8.1. Syntax: ¶

The


      append

basic syntax format of the command is as follows:

append 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 )

1.8.2. Example ¶

Examples are as follows:

First we store a key in Memcached runoob whose value is memcached .

Then, we use the get command to retrieve the value.

Then, we use the append The command before the key is runoob append “redis” to the value.

Finally, we will use the get command to retrieve the value.

set runoob 0 900 9
memcached
STORED
get runoob
VALUE runoob 0 9
memcached
END
append runoob 0 900 5
redis
STORED
get runoob
VALUE runoob 0 14
memcachedredis
END

In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress.