Memcached的 flush_all 命令用于刪除memcached服務(wù)器中的所有數(shù)據(jù)(鍵值對(duì))。它接受一個(gè)叫做time可選參數(shù)，表示這個(gè)時(shí)間后的所有memcached數(shù)據(jù)會(huì)被清除。

語(yǔ)法

memcached 的 flush_all 命令的基本語(yǔ)法如下所示：

flush_all [time] [noreply]

上面的命令總是返回OK

示例

在下面給出的例子中，我們存儲(chǔ)一些數(shù)據(jù)到 memcached 服務(wù)器，然后清除所有數(shù)據(jù)。

set yiibai 0 900 9
memcached
STORED
get yiibai
VALUE yiibai 0 9
memcached
END
flush_all
OK
get yiibai
END

使用Java應(yīng)用程序清除數(shù)據(jù)

要清除memcached服務(wù)器的數(shù)據(jù)，則需要使用memcached的flush 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("count", 900, "5").isDone());
      //Get value from cache
      System.out.println("Get from Cache:"+mcc.get("count"));
      // now increase the stored value
      System.out.println("Increment value:"+mcc.incr("count", 2));
      // now decrease the stored value
      System.out.println("Decrement value:"+mcc.decr("count", 1));
      // now get the final stored value
      System.out.println("Get from Cache:"+mcc.get("count"));
      // now clear all this data
      System.out.println("Clear data:"+mcc.flush().isDone());
   }
}

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:5
Increment value:7
Decrement value:6
Get from Cache:6
Clear data:true