groupservicebean.java

来自「EJB3 Annotation Sample」· Java 代码 · 共 72 行

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package com.s7turn.security.session;

import com.s7turn.security.entity.Account;
import com.s7turn.security.entity.Group;
import java.sql.Date;
import java.util.Calendar;
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 GroupServiceBean implements GroupServiceLocal {
    
    @PersistenceContext(unitName="s7turn-pu")
    private EntityManager em;

    public void save(Group t) 
    {
        t.setLastUpdated( new Date(Calendar.getInstance().getTimeInMillis() ) );
        if( t.getId() == null || new Long(0).equals( t.getId() )  )
        {
            em.persist(t);
        }
        else
        {
            em.merge(t);
        }        
    }

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

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

    public List<Group> getAllItems() 
    {
        Query q = em.createNamedQuery("Group.findAllItems");
        return q.getResultList();
    }
    
    public List<Account> getAllMembers(Group g)
    {
        Query q = em.createNamedQuery("AccountGroup.findAllMembers");
        q.setParameter("group", g);
        return q.getResultList();
    }
 
}