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 tutorialspoint 0 900 9
memcached
stored
get tutorialspoint
value tutorialspoint 0 9
memcached
end
delete tutorialspoint
deleted
get tutorialspoint
end
delete tutorialspoint
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("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());
   }
}

output

on compiling and executing the program, you get to see the following output −

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