AbdUserFacade.java

package de.fhb.autobday.dao;

import de.fhb.autobday.data.AbdUser;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.PersistenceContext;

/**
 * Facade-pattern for database operations for users.
 *
 * @author Michael Koppen mail: koppen@fh-brandenburg.de
 */
@Stateless
public class AbdUserFacade extends AbstractFacade<AbdUser> {

	@PersistenceContext(unitName = "Auto-B-Day-ejbPU")
	private EntityManager em;

	@Override
	public EntityManager getEntityManager() {
		return em;
	}

	@Override
	public void setEntityManager(EntityManager em) {
		this.em = em;
	}

	/**
	 * finds user with given username.
	 *
	 * @param username
	 * @return user
	 */
	public AbdUser findUserByUsername(String username) {
		AbdUser user = null;

		try {
			user = (AbdUser) em.createNamedQuery("AbdUser.findByUsername").setParameter("username", username).getSingleResult();
		} catch (NoResultException e) {
			System.out.println("Exception: " + e.getMessage());
		}
		return user;
	}

	public AbdUserFacade() {
		super(AbdUser.class);
	}
}