Hibernate的loadsession类

http://blog.csdn.net/sunyujia/article/details/2549564

ThreadLoal的变量设session

是获取/创建时最迟将Threadlocal设为session的对象保护起来

提交/回滚时最早将Threadlocal的对象set成null

package Load;

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


public class loadsession {
static Session session=null;
private static ThreadLocal sessionThread=new ThreadLocal();//存hibernate的session
private  static ThreadLocal transactionThread=new ThreadLocal();//存事务
static SessionFactory sf=null;
public static Session  getsession()
{
Configuration conf=new Configuration().configure();
sf=conf.buildSessionFactory();
         session=(Session) sessionThread.get();
if(session==null){
session=sf.openSession();}
else{
session=sf.getCurrentSession();
}
sessionThread.set(session);
return session;
}
public static void closesession()
{
session=(Session) sessionThread.get();
if(session!=null){
session.flush();
session.close();
sf.close();
sessionThread.set(null);
}
      
}

//获取当前session的事务
public static Transaction transaction()
{
Transaction trans=(Transaction) transactionThread.get();
if(trans==null)
{
trans=session.beginTransaction();
transactionThread.set(trans);

}
return trans;
}

//提交事务
public void comitTransaction()
{
Transaction trans=(Transaction) transactionThread.get();
transactionThread.set(null);
if(trans!=null)
{
trans.commit();

}
}

//回滚当前事务
public void rollbackTransaction()
{
Transaction tx=(Transaction) transactionThread.get();
transactionThread.set(null);
if(tx!=null)
{
tx.rollback();
}
}

}

测试 类

1. public static void main(String[] args) throws Exception {  
2.   
3.     HibernateUtil.initSessionFactory(new File(Test.class.getClassLoader()  
4.   
5.             .getResource("hibernate.cfg.xml").getFile()));  
6.   
7.     Session session = HibernateUtil.getSession();  
8.   
9.     HibernateUtil.transaction();  
10.   
11.     User u = new User();  
12.   
13.     u.setName("test");  
14.   
15.     session.save(u);  
16.   
17.     HibernateUtil.commitTransaction();  
18.   
19.     HibernateUtil.closeSession();  
20.   
21. }