Memcached刪除/Delete數據

Memcached的delete命令用於刪除memcached伺服器現有的鍵。

語法

memcached delete命令的基本語法如下所示：

delete key

如果鍵成功刪除，則返回DELETED，如果key沒有找到則返回NOT_FOUND，否則返回ERROR。

示例

set zaixian 0 900 9
memcached
STORED
get zaixian
VALUE zaixian 0 9
memcached
END
delete zaixian
DELETED
get zaixian
END
delete zaixian
NOT_FOUND

在上面的例子中，我們已經使用zaixian作為鍵，並存儲在memcached其900秒後失效，之後刪除所存儲的鍵。

使用Java應用程式刪除數據

要從memcached伺服器中刪除數據，需要使用memcached的delete方法。

示例

import net.spy.memcached.MemcachedClient;
public class MemcachedJava {
   public static void main(String[] args) {
      //Connecting to Memcached server on localhost
      MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
      System.out.println("Connection to server sucessfully");
      System.out.println("set status:"+mcc.set("zaixian", 900, "memcached").done);
      //Get value from cache
      System.out.println("Get from Cache:"+mcc.get("zaixian"));
      //delete value from cache
      System.out.println("Delete from Cache:"+mcc.delete("zaixian").isDone());
      //check whether value exists or not
      System.out.println("Get from Cache:"+mcc.get("zaixian"));
   }
}

輸出

當上述程式編譯和運行，它提供了以下的輸出：

Connection to server successfully
set status:true
Get from Cache:memcached
Delete from Cache:true
Get from Cache:null