Memcached delete command is used to delete an existing key from the Memcached server.
Syntax
The basic syntax of Memcached delete command is as shown below −
delete key [noreply]
Output
CAS command may produce one of the following result −
DELETED indicates successful deletion.
ERROR indicates error while deleting data or wrong syntax.
NOT_FOUND indicates that the key does not exist in the Memcached server.
Example
In this example, we use tutorialspoint as a key and store memcached in it with an expiration time of 900 seconds. After this, it deletes the stored key.
set madanswer 0 900 9
memcached
STORED
get madanswer
VALUE madanswer 0 9
memcached
END
delete madanswer
DELETED
get madanswer
END
delete madanswer
NOT_FOUND
Delete Data Using Java Application
To delete data from a Memcached server, you need to use the Memcached delete method.
Example
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("madanswer", 900, "World's largest question library");
// print status of set method
System.out.println("set status:" + fo.get());
// retrieve and check the value from cache
System.out.println("madanswer value in cache - " + mcc.get("madanswer"));
// try to add data with existing key
Future fo = mcc.delete("t