package com;

import org.hibernate.HibernateException;
import org.hibernate.cfg.Configuration;
import org.hibernate.SessionFactory;
import org.hibernate.Session;
import java.util.Properties;

public class HibernateUtil 
{
    public static final SessionFactory sessionFactory;

    static 
    {
        try 
        {
            //從hibernate.cfg.xml創建SessionFactory 
            Configuration cfg =  new Configuration();
            sessionFactory = cfg.configure().buildSessionFactory();
        } 
        catch (Throwable ex) 
        {
            System.err.println("開始創建SessionFactory失敗." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static final ThreadLocal session = new ThreadLocal();

    public static Session currentSession() throws HibernateException 
    {
        Session s = (Session) session.get();
        if (s == null) 
        {
            s = sessionFactory.openSession();
            session.set(s);
        }
     
        return s;
    }

    public static void closeSession() throws HibernateException 
    {
        Session s = (Session) session.get();
        if (s != null)
            s.close();
    
        session.set(null);
    }
}