templateservicebean.java

来自「EJB3 Annotation Sample」· Java 代码 · 共 63 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.Channel;
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 TemplateServiceBean implements TemplateServiceLocal
{
        @PersistenceContext(unitName="s7turn-pu")
        private EntityManager em;

    public void saveTemplate(Template t) {
        if( t.getId() == null || new Long(0).equals(t.getId()))
            em.persist(t);
        else
            em.merge(t);
    }

    public void removeTemplate(Template t) {
        
        em.remove(em.merge(t));
    }
    
    public Template findTemplate( Long id )
    {
        Query q = em.createNamedQuery("Template.findTemplateById");
        q.setParameter("id", id);
        try{
            return (Template) q.getSingleResult();
        }catch(NoResultException e){
            return null;
        }
        
    }

    public List getAllTemplates() {
        Query q = em.createNamedQuery("Template.findAllTemplates");
        return q.getResultList();
    }

    public List getTemplates(Channel chn) {
        Query q = em.createNamedQuery("Template.findByChannel");
        q.setParameter( "channel" , chn );
        return q.getResultList();
    }

}