Memcached delete 命令用于从Memcached服务器中删除现有密钥.
基本Memcached delete 命令的语法如下所示 :
delete key [noreply]
CAS命令可能会产生以下结果之一 :
DELETED 表示删除成功.
错误表示删除数据或语法错误时出错.
NOT_FOUND 表示该密钥在Memcached服务器中不存在.
在此示例中,我们使用it1352作为密钥,并在其中存储memcached并且到期时间为900秒.在此之后,它删除存储的密钥.
set it1352 0 900 9 memcached STORED get it1352 VALUE it1352 0 9 memcached END delete it1352 DELETED get it1352 END delete it1352 NOT_FOUND
要从Memcached服务器删除数据,你需要使用Memcached 删除方法.
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("it1352", 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("it1352 value in cache - " + mcc.get("IT屋")); // try to add data with existing key Future fo = mcc.delete("it1352"); // print status of delete method System.out.println("delete status:" + fo.get()); // retrieve and check the value from cache System.out.println("it1352 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,你会到达请参阅以下输出 :
Connection to server successful set status:true IT屋 value in cache - World's largest online tutorials library delete status:true IT屋 value in cache - null