Memcached - Delete data

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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

If the key is successfully deleted, then it returns DELETED. If the key is not found, then it returns NOT_FOUND, otherwise it returns ERROR.

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 net.spy.memcached.MemcachedClient;
public class MemcachedJava {
   public static void main(String[] args) {
      
      // Connecting to Memcached server on localhost
      MemcachedClient mcc = new MemcachedClient(new
      InetSocketAddress("127.0.0.1", 11211));
      System.out.println("Connection to server successful");
      System.out.println("set status:"+mcc.set("tutorialspoint", 900, "memcached").done);
      
      // Get value from cache
      System.out.println("Get from Cache:"+mcc.get("tutorialspoint"));
      
      // delete value from cache
      System.out.println("Delete from Cache:"+mcc.delete("tutorialspoint").isDone());
      
      // check whether value exists or not
      System.out.println("Get from Cache:"+mcc.get("tutorialspoint"));
   }
}

Output

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

Connection to server successful
set status:true
Get from Cache:memcached
Delete from Cache:true
Get from Cache:null