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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. Recommend the tutorial
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();
}
}
Posted on: April 18, 2011
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