Memcached 删除键
Telnet删除键
Memcached delete命令用于从Memcached服务器删除现有键。
Memcached delete命令的基本语法如下所示-
delete key [noreply]
返回
- DELETED - 表示删除成功。
- ERROR - 表示删除数据时出错或语法错误。
- NOT_FOUND - 表示该密钥在Memcached服务器中不存在。
在此示例中，我们将 jc2182 用作密钥，并将memcached存储在其中，有效时间为900秒。此后，它将删除存储的密钥。
set jc2182 0 900 9
memcached
STORED
get jc2182
VALUE jc2182 0 9
memcached
END
delete jc2182
DELETED
get jc2182
END
delete jc2182
NOT_FOUND
使用Java应用程序删除键
要在Memcached服务器中删除键，您需要使用Memcached delete方法。
import java.io.IOException;
import java.net.InetSocketAddress;
import net.spy.memcached.MemcachedClient;
public class MemcachedJava {
public static void main(String[] args) {
// Connecting to Memcached server on localhost
MemcachedClient mcc = null;
try {
mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
} catch (IOException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
System.out.println("Connection to server sucessfully");
// 设置数据库 第一个参数key 第二个参数过期时间，第三个参数value
System.out.println("set status:" + mcc.set("jc2182", 900, "memcachd").getStatus());
System.out.println("Get from Cache:" + mcc.get("jc2182"));
System.out.println("Delete Key " + mcc.delete("jc2182").getStatus());
System.out.println("Get from Cache:" + mcc.get("jc2182"));
}
}
输出
Connection to server sucessfully
set status:{OperationStatus success=true: STORED}
Get from Cache:memcachd
Delete Key {OperationStatus success=true: DELETED}
Get from Cache:null