最近几年来,地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持,如城市管理、区划、环境整治等等,地理信息成为信息时代重要的组成部分之一; “数字地球”概念的提出,更进一步推动了作为其技术支撑的GIS的发展。 与此同时,一些学者致力于相关的理论研究,如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面,并且这两个方面构成了相互促进的发展过程。
Memcached add command is used to use the value (data value) is stored in the specified key .
If The The parameters are described as follows: In the following example, we set: Key → new_key Flag → 0 Exptime → 900 (in seconds) Bytes → 10 (bytes of data storage) Value → data_value If the data is added successfully, the output: Output information description: add of key already exists, the data will not be updated (expired key Will be updated), the previous value will remain the same, and you will get a response NOT_STORED . 1.6.1. Syntax: ¶
add basic syntax format of the command is as follows:add key flags exptime bytes [noreply] value
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 ) 1.6.2. Example ¶
add new_key 0 900 10 data_value STORED get new_key VALUE new_key 0 10 data_value END
1.6.3. Output ¶
STORED STORED :Output after being saved successfully NOT_STORED :Output after a failed save