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();

         }

     }

 }

 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();

     }

 }