Memcached - 删除数据

Memcached delete 命令用于从 Memcached 服务器中删除现有键。

语法

Memcached delete 命令的基本语法如下所示 −

delete key

如果键被成功删除，则返回 DELETED。如果未找到键，则返回 NOT_FOUND，否则返回 ERROR。

示例

在此示例中，我们使用 tutorialspoint 作为键，并在其中存储了 memcached，过期时间为 900 秒。此后，它将删除存储的键。

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

使用 Java 应用程序删除数据

要从 Memcached 服务器删除数据，您需要使用 Memcached 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 successful");
      System.out.println("set status:"+mcc.set("tutorialspoint", 900, "memcached").done);
      
      // Get value from cache
      System.out.println("Get from Cache:"+mcc.get("tutorialspoint"));
      
      // delete value from cache
      System.out.println("Delete from Cache:"+mcc.delete("tutorialspoint").isDone());
      
      // check whether value exists or not
      System.out.println("Get from Cache:"+mcc.get("tutorialspoint"));
   }
}

输出

在编译并执行程序后，您将看到以下输出 −

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