Hibernate下创建SessionFactory（hibernate3.x与hibernate4.x）

最新推荐文章于 2019-10-19 13:39:02 发布

CoderPrince

最新推荐文章于 2019-10-19 13:39:02 发布

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分类专栏： Hibernate 文章标签： hibernate

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Hibernate 3.x 的HibernateUtil

程序代码

package com.yihaomen.hibernate.util;

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

public class HibernateUtil {

    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {
        try {
            return new Configuration().configure().buildSessionFactory();
        }
        catch (Throwable ex) {
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }

    public static void shutdown() {
        getSessionFactory().close();
    }

}

hibernate4.x 的HibernateUtil

程序代码

package com.yihaomen.hibernate.util;

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

public class HibernateUtil
{
    private static final SessionFactory sessionFactory;
    static
    {
        try
        {
            Configuration cfg = new Configuration().configure();
            ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(cfg.getProperties()).build();

            sessionFactory = cfg.buildSessionFactory(serviceRegistry);
        }
        catch (Throwable e)
        {
            throw new ExceptionInInitializerError(e);
        }
    }

    private HibernateUtil()
    {
    }

    public static SessionFactory getSessionFactory()
    {
        return sessionFactory;
    }

}

创建线程安全的Session（3.x）：

package com.yywz.util;

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

public class HibernateUtil {

private static SessionFactory factory;
private static ThreadLocal<Session> threadLocal;

static{
   try {
    factory = new Configuration().configure().buildSessionFactory();
   } catch (HibernateException e) {
     System.err.println(e.getMessage());
   }
   threadLocal = new ThreadLocal<Session>();
}

private HibernateUtil(){

}

public static Session getSession()throws HibernateException{
   Session session = threadLocal.get();
   if(session==null){
    session = factory.openSession();
    threadLocal.set(session);
   }
   return session;
}

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