directoryservicebean.java.svn-base

来自「EJB3 Annotation Sample」· SVN-BASE 代码 · 共 66 行

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package com.s7turn.content.session;

import com.s7turn.content.entities.Directory;
import com.s7turn.sdk.content.DirectoryInfo;
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 DirectoryServiceBean implements DirectoryServiceLocal {

    @PersistenceContext(unitName="s7turn-pu")
    private EntityManager em;
    
    public List<DirectoryInfo> getChildren(Directory parent) {
        Query q = em.createNamedQuery("Directory.findAllChildren");
        q.setParameter("parent", parent);
        return q.getResultList(); 
    }

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

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

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

    public List<Directory> getAllItems() {
        Query q = em.createNamedQuery("Directory.findAllTopDirectories");
        //q.setParameter("parent", parent);
        return q.getResultList(); 
    }
    
 
}