hibernate工具类

最新推荐文章于 2019-09-24 17:27:54 发布

原创最新推荐文章于 2019-09-24 17:27:54 发布 · 77 阅读

CC 4.0 BY-SA版权

本文介绍了一个针对Hibernate框架的工具类实现，该工具类提供了一系列的方法来简化Hibernate的使用过程，如打开和关闭Session、开始和提交事务等。通过这个工具类可以更方便地进行数据库操作。

package com.btr.hb;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.Transaction;
/**
* @author linliangyi@team of miracle
*
*   Hibernate 工具类
*
*/
public class HibernateUtil {

    private static Log log = LogFactory.getLog(HibernateUtil.class);
    private static final SessionFactory sessionFactory;

    static {
        try {
            // Create the SessionFactory
            sessionFactory = new Configuration().configure().buildSessionFactory();
        } catch (Throwable ex) {
           ex.printStackTrace();
            log.error("Initial SessionFactory creation failed.", ex);
            throw new ExceptionInInitializerError(ex);
        } // end of the try - catch block
    } // end of static block

    public static final ThreadLocal localSession = new ThreadLocal();
    public static final ThreadLocal localTransaction = new ThreadLocal();

    public static Session openSession() throws HibernateException {
       Session session = (Session)localSession.get();
       if(session == null){
           session = sessionFactory.openSession();
           localSession.set(session);
       }

       if(!session.isOpen()){
           localSession.set(null);
           session = sessionFactory.openSession();
           localSession.set(session);
       }
        return session;
    }

    public static void closeSession() throws HibernateException {
       Session session = (Session)localSession.get();
       localSession.set(null);
       if(session != null){
            session.close();
            session = null;
       }
    }

    public static Transaction beginTransaction() throws HibernateException {
       Transaction tx = (Transaction)localTransaction.get();
       if(tx == null){
           tx = openSession().beginTransaction();
           localTransaction.set(tx);
       }
       if(tx.wasCommitted()) {
           tx = null;
           tx = openSession().beginTransaction();
           localTransaction.set(tx);
       }
       return tx;
    }

    public static void commitTransaction() throws HibernateException {
       Transaction tx = (Transaction)localTransaction.get();
       localTransaction.set(null);
       if(tx != null){
           tx.commit();
           tx = null;
       }
    }

    public static void rollbackTransaction() throws HibernateException {
       Transaction tx = (Transaction)localTransaction.get();
       localTransaction.set(null);
       if(tx != null){
           tx.rollback();
           tx = null;
       }
    }

    public static void main(String[] args){
    }
}