HibernateUtil

最新推荐文章于 2019-08-28 14:28:00 发布

lizarbhc

最新推荐文章于 2019-08-28 14:28:00 发布

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文章标签： session import null exception class

本文介绍了一个用于简化Hibernate操作的工具类实现，包括如何初始化SessionFactory、获取及关闭Session、开始及提交事务等关键方法。

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import net.sf.hibernate.HibernateException;
import net.sf.hibernate.Session;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.Transaction;
import net.sf.hibernate.cfg.Configuration;

public class HibernateUtil {

private static SessionFactory sessionFactory;
//private static Log log = LogFactory.getLog(HibernateUtil.class);
static{
try{
   //创建SessionFactory
   sessionFactory = new Configuration().configure()
    .buildSessionFactory();
}catch(Throwable ex){
   ex.printStackTrace();
   System.out.println();
}
}
public static final ThreadLocal tLocalsess = new ThreadLocal();
public static final ThreadLocal tLocaltx = new ThreadLocal();

//取得Session
public static Session currentSession(){
Session session = (Session)tLocalsess.get();
//如果当前的不可用，打开一个新的session
try{
   if(session == null || !session.isOpen()){
    session = sessionFactory.openSession();
    tLocalsess.set(session);
   }
}catch(Exception e){
   e.printStackTrace();
}
return session;
}

//关闭Session
public static void closeSession(){
Session session = (Session)tLocalsess.get();
tLocalsess.set(null);
try{
   if(session != null && session.isOpen()){
    session.close();
   }
}catch(HibernateException e){
   e.printStackTrace();
}
}

//开始事务
public static void beginTransaction(){
//声明Transaction类型对象tx，并赋初值
Transaction tx = (Transaction)tLocaltx.get();
try{
   if(tx == null){
    tx = currentSession().beginTransaction();
    tLocaltx.set(tx);
   }
}catch(HibernateException e){
   e.printStackTrace();
}
}

//关闭事务
public static void commitTransaction(){
Transaction tx = (Transaction)tLocaltx.get();
try{
   if(tx != null && !tx.wasCommitted() && !tx.wasRolledBack()){
    tx.commit();
   }
   tLocaltx.set(null);
   System.out.println("commit tx");
}catch(HibernateException e){
   e.printStackTrace();
}
}

//事务回滚
public static void roollbackTransaction(){
Transaction tx = (Transaction)tLocaltx.get();
try{
   tLocaltx.set(null);
   if(tx != null && !tx.wasCommitted() && !tx.wasRolledBack()){
    tx.rollback();
   }
}catch(HibernateException e){
   e.printStackTrace();
}
}

private static Session openSession() throws HibernateException{
return getSessionFactory().openSession();
}

private static SessionFactory getSessionFactory() throws HibernateException{
return sessionFactory;
}
}