Home C-tutorials EJB create method

Related Tutorials


 
 

Share on Google+Share on Google+

EJB create method

Advertisement
EJB create method

EJB create method

     

In this tutorial we are describing you about the EJB create method. The create() method is used for creating the EJBean. The other methods which are used in the program given below ..

private EntityManager em:-Defines an Interface instance. The interface Entity manager is associated with the persistence context.

em.persist(newsEntity):-This method makes an entity instance managed and persistent.

em.merge(newsEntity):-This method merge the state of the given entity into the current persistence context.

em.remove(em.merge(newsEntity)):-By using this method we can remove the entity instance.

em.find(ejb.NewsEntity.class, id):-This methods find the entity instance by the primary key. Here primary key is id.

package ejb;

import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;


@Stateless
public class NewsEntityFacade implements
   
NewsEntityFacadeLocal {

@PersistenceContext
private EntityManager em;

  public void create(NewsEntity newsEntity) {
  em.persist(newsEntity);
  }

  public void edit(NewsEntity newsEntity) {
  em.merge(newsEntity);
  }

  public void remove(NewsEntity newsEntity) {
  em.remove(em.merge(newsEntity));
  }

  public NewsEntity find(Object id) {
  return em.find(ejb.NewsEntity.class, id);
  }

  public List findAll() {
 return em.
createQuery(
"select object(o) from NewsEntity as o").
getResultList
();
  }

}

Download source code

Advertisement

If you enjoyed this post then why not add us on Google+? Add us to your Circles



Liked it!  Share this Tutorial


Follow us on Twitter, or add us on Facebook or Google Plus to keep you updated with the recent trends of Java and other open source platforms.

Posted on: April 18, 2011

Related Tutorials

Discuss: EJB create method  

Post your Comment


Your Name (*) :
Your Email :
Subject (*):
Your Comment (*):
  Reload Image
 
 
Comments:0
DMCA.com