Memcached刪除/Delete數(shù)據(jù)

Memcached的delete命令用于刪除memcached服務(wù)器現(xiàn)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 yiibai 0 900 9
memcached
STORED
get yiibai
VALUE yiibai 0 9
memcached
END
delete yiibai
DELETED
get yiibai
END
delete yiibai
NOT_FOUND

在上面的例子中，我們已經(jīng)使用yiibai作為鍵，并存儲(chǔ)在memcached其900秒后失效，之后刪除所存儲(chǔ)的鍵。

使用Java應(yīng)用程序刪除數(shù)據(jù)

要從memcached服務(wù)器中刪除數(shù)據(jù)，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("yiibai", 900, "memcached").done);
      //Get value from cache
      System.out.println("Get from Cache:"+mcc.get("yiibai"));
      //delete value from cache
      System.out.println("Delete from Cache:"+mcc.delete("yiibai").isDone());
      //check whether value exists or not
      System.out.println("Get from Cache:"+mcc.get("yiibai"));
   }
}

輸出

當(dāng)上述程序編譯和運(yùn)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