📅  最后修改于: 2020-11-27 05:44:53             🧑  作者: Mango
Memcached delete命令用于从Memcached服务器删除现有密钥。
Memcached delete命令的基本语法如下所示-
delete key [noreply]
CAS命令可能会产生以下结果之一-
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tutorialspoint用作键,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 tutorialspoint 0 900 9
memcached
STORED
get tutorialspoint
VALUE tutorialspoint 0 9
memcached
END
delete tutorialspoint
DELETED
get tutorialspoint
END
delete tutorialspoint
NOT_FOUND
要从Memcached服务器删除数据,您需要使用Memcached delete方法。
import java.net.InetSocketAddress;
import java.util.concurrent.Future;
import net.spy.memcached.MemcachedClient;
public class MemcachedJava {
public static void main(String[] args) {
try{
// Connecting to Memcached server on localhost
MemcachedClient mcc = new MemcachedClient(new InetSocketAddress("127.0.0.1", 11211));
System.out.println("Connection to server sucessful.");
// add data to memcached server
Future fo = mcc.set("tutorialspoint", 900, "World's largest online tutorials library");
// print status of set method
System.out.println("set status:" + fo.get());
// retrieve and check the value from cache
System.out.println("tutorialspoint value in cache - " + mcc.get("tutorialspoint"));
// try to add data with existing key
Future fo = mcc.delete("tutorialspoint");
// print status of delete method
System.out.println("delete status:" + fo.get());
// retrieve and check the value from cache
System.out.println("tutorialspoint value in cache - " + mcc.get("codingground"));
// Shutdowns the memcached client
mcc.shutdown();
}catch(Exception ex)
System.out.println(ex.getMessage());
}
}
在编译和执行程序时,您将看到以下输出-
Connection to server successful
set status:true
tutorialspoint value in cache - World's largest online tutorials library
delete status:true
tutorialspoint value in cache - null