categoryservicebean.java

来自「EJB3 Annotation Sample」· Java 代码 · 共 89 行

/*
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 * and open the template in the editor.
 */

package com.s7turn.content.session;

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

/**
 *
 * @author Long
 */
@Stateless
public class CategoryServiceBean implements CategoryServiceLocal {

    @PersistenceContext(unitName="s7turn-pu")
    private EntityManager em;
    
    public List getAllCategory() {
        Query q = em.createNamedQuery("Category.findAllCategory");
        return q.getResultList();
    }

    public void saveCategory(Category cate) {
        if( cate.getId() == null || new Long(0).equals(cate.getId()))
            em.persist(cate);
        else
            em.merge(cate);
    }

    public void delete(Category cate) {
        em.remove( em.merge(cate) );
    }

    public List getAllSubCategory() {
        Query q = em.createNamedQuery("SubCategory.findAllSubCategory");
        return q.getResultList();
    }

    public List getSubCategory(Category ct) {
        Query q = em.createNamedQuery("SubCategory.findByCategory");
        q.setParameter("category", ct);
        return q.getResultList();
    }

    public void saveSubCategory(SubCategory cate) {
        if( cate.getId() == null || new Long(0).equals(cate.getId()))
            em.persist(cate);
        else
            em.merge(cate);
    }

    public void deleteSubCategory(SubCategory cate) {
        em.remove(cate);
    }

    public Category findCategory(Long id) {
        Query q = em.createNamedQuery("Category.findCategoryById");
        q.setParameter("id", id);
        try{
            return (Category)q.getSingleResult();
        }catch(NoResultException r){
            return null;
        }
    }

    public SubCategory findSubCategory(Long id) {
        Query q = em.createNamedQuery("SubCategory.findSubCategoryById");
        q.setParameter("id", id);
        try{
            return (SubCategory)q.getSingleResult();
        }catch(NoResultException r){
            return null;
        }
    }
    
    // Add business logic below. (Right-click in editor and choose
    // "EJB Methods > Add Business Method" or "Web Service > Add Operation")
 
}