propertyservicebean.java

来自「EJB3 Annotation Sample」· Java 代码 · 共 68 行

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package com.s7turn.content.session;

import com.s7turn.content.entities.Property;
import com.s7turn.content.entities.Template;
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

/**
 *
 * @author Long
 */
@Stateless
public class PropertyServiceBean implements PropertyServiceLocal {

    @PersistenceContext(unitName="s7turn-pu")
    private EntityManager em;
    
    public void save(Property t) {
        if( t.getId() == null || new Long(0).equals(t.getId()) )
        {
            em.persist(t);
        }
        else
        {
            em.merge(t);
        }
    }

    public void remove(Property t) {
        em.remove(em.merge(t));
    }

    public Property findById(Long id) {
        Query q = em.createNamedQuery("Property.findPropertyById");
        q.setParameter("id", id);
        try{
            return (Property) q.getSingleResult();
        }catch(NoResultException e)
        {
            return null;
        }
    }

    public List<Property> getAllItems() {
        Query q = em.createNamedQuery("Property.findAllProperties");
        return q.getResultList();
    }

    public List<Property> findByTemplate(Template t) {
        Query q = em.createNamedQuery("Property.findPropertiesByTemplate");
        q.setParameter("template", t);
        return q.getResultList();
    }
    
    // Add business logic below. (Right-click in editor and choose
    // "EJB Methods > Add Business Method" or "Web Service > Add Operation")
 
}