Memcached - 刪除資料

Memcached delete 命令用於從 Memcached 伺服器中刪除現有鍵。

語法

Memcached delete 命令的基本語法如下所示 −

delete key

如果鍵被成功刪除，則返回 DELETED。如果未找到鍵，則返回 NOT_FOUND，否則返回 ERROR。

示例

在此示例中，我們使用 tutorialspoint 作為鍵，並在其中儲存了 memcached，過期時間為 900 秒。此後，它將刪除儲存的鍵。

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 應用程式刪除資料

要從 Memcached 伺服器刪除資料，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"));
   }
}

輸出

在編譯並執行程式後，您將看到以下輸出 −

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