hibernateUtils

hibernate3.x版本

package hibernate_01;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class hibernateUtils {
    private static Configuration cfg = null;
    private static SessionFactory sessionFactory = null;
    private static Session session = null;
    static{
        cfg = new Configuration().configure();
        sessionFactory = cfg.buildSessionFactory();
    }
    public static Session getSession(){
        if(sessionFactory!=null){
            session = sessionFactory.openSession();
        }else{
            sessionFactory = cfg.buildSessionFactory();
        }
        return session = sessionFactory.openSession();
    }
    public static void closeSession(){
        if(session != null && session.isOpen()){
            session.close();
        }
    }
}

hibernate4.x

package cn.siggy.util;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {
    private static Configuration cfg=null;
    private static SessionFactory factory=null;
    private static Session session = null;
    static{
        cfg = new Configuration().configure();
        factory = cfg.buildSessionFactory(new StandardServiceRegistryBuilder()
        .applySettings(cfg.getProperties()).build());
    }
    public static Session getSession(){
        if(factory!=null)
            return factory.openSession();
        factory=cfg.buildSessionFactory(new StandardServiceRegistryBuilder()
        .applySettings(cfg.getProperties()).build());
        return session = factory.openSession();
    }
    public static void closeSession(){
        if(session!=null&&session.isOpen())
            session.close();
    }
}