hibernateUtils

hibernate3.x版本

 1 package hibernate_01;
 2 
 3 import org.hibernate.Session;
 4 import org.hibernate.SessionFactory;
 5 import org.hibernate.cfg.Configuration;
 6 
 7 public class hibernateUtils {
 8     private static Configuration cfg = null;
 9     private static SessionFactory sessionFactory = null;
10     private static Session session = null;
11     static{
12         cfg = new Configuration().configure();
13         sessionFactory = cfg.buildSessionFactory();
14     }
15     public static Session getSession(){
16         if(sessionFactory!=null){
17             session = sessionFactory.openSession();
18         }else{
19             sessionFactory = cfg.buildSessionFactory();
20         }
21         return session = sessionFactory.openSession();
22     }
23     public static void closeSession(){
24         if(session != null && session.isOpen()){
25             session.close();
26         }
27     }
28 }

hibernate4.x

 1 package cn.siggy.util;
 2 
 3 import org.hibernate.Session;
 4 import org.hibernate.SessionFactory;
 5 import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
 6 import org.hibernate.cfg.Configuration;
 7 
 8 public class HibernateUtil {
 9     private static Configuration cfg=null;
10     private static SessionFactory factory=null;
11     private static Session session = null;
12     static{
13         cfg = new Configuration().configure();
14         factory = cfg.buildSessionFactory(new StandardServiceRegistryBuilder()
15         .applySettings(cfg.getProperties()).build());
16     }
17     public static Session getSession(){
18         if(factory!=null)
19             return factory.openSession();
20         factory=cfg.buildSessionFactory(new StandardServiceRegistryBuilder()
21         .applySettings(cfg.getProperties()).build());
22         return session = factory.openSession();
23     }
24     public static void closeSession(){
25         if(session!=null&&session.isOpen())
26             session.close();
27     }
28 }