Memcached删除/Delete数据

发布于 2015-06-28 02:31:02 | 349 次阅读 | 评论: 1 | 来源: 网络整理

Memcached的delete命令用于删除memcached服务器现有的键。

语法

memcached delete命令的基本语法如下所示：

delete key

如果键成功删除，则返回DELETED，如果key没有找到则返回NOT_FOUND，否则返回ERROR。

示例

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

在上面的例子中，我们已经使用phperz作为键，并存储在memcached其900秒后失效，之后删除所存储的键。

使用Java应用程序删除数据

要从memcached服务器中删除数据，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("phperz", 900, "memcached").done);
      //Get value from cache
      System.out.println("Get from Cache:"+mcc.get("phperz"));
      //delete value from cache
      System.out.println("Delete from Cache:"+mcc.delete("phperz").isDone());
      //check whether value exists or not
      System.out.println("Get from Cache:"+mcc.get("phperz"));
   }
}

输出

当上述程序编译和运行，它提供了以下的输出：

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