Hibernate之openSession和getCurrentSession

本文主要是介绍Hibernate之openSession和getCurrentSession，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

在Hibernate之基础配置测试用例中已经用到了openSession；

开启hibernate会话的方式：

//读取hibernate.cfg.xml文件
//Configuration方法默认加载hibernate.properties；configure方法默认加载hibernate.cfg.xml
Configuration cfg = new Configuration().configure();
//建立SessionFactory
SessionFactory factory = cfg.buildSessionFactory();
Session session = factory.openSession();

Hibernate4开启会话工厂方法

Configuration configuration = new Configuration().configure(); 
ServiceRegistry serviceRegistry=new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);

Hibernate5.0Final之后用StandarServiceRegistryBuilder取代了ServiceRegistryBuilder；

会话工厂获取会话的两种方式：

1.openSession方式：

StandardServiceRegistry  serviceRegistry = new StandardServiceRegistryBuilder().configure().build(); 
SessionFactory sessionFactory=new MetadataSources(serviceRegistry).buildMetadata().buildSessionFactory();
Session session = null;
try{session = sessionFactory.openSession();session.beginTransaction();User user = new User("陈三","1");session.save(user);session.getTransaction().commit();
}catch(Exception e) {e.printStackTrace();//回滚事务session.getTransaction().rollback();
}finally {if (session != null) {if (session.isOpen()) {//关闭sessionsession.close();}}
}

需要手动关闭session；除了查询，增删改都需要开启事务；

2.getCurrentSession

StandardServiceRegistry  serviceRegistry = new StandardServiceRegistryBuilder().configure().build(); 
SessionFactory sessionFactory=new MetadataSources(serviceRegistry).buildMetadata().buildSessionFactory();Session session = null;
try{session = sessionFactory.getCurrentSession();session.beginTransaction();User user = new User("陈三","1");session.save(user);session.getTransaction().commit();
}catch(Exception e) {e.printStackTrace();//回滚事务session.getTransaction().rollback();
}

运行报错：
Exception in thread "main" org.hibernate.HibernateException: No CurrentSessionContext configured!

需要在hibernate.cfg.xml配置事务管理

<property name="current_session_context_class">thread</property>

或者

<property name="current_session_context_class">jta</property>

请参考：http://www.cnblogs.com/lihaoyang/p/4853897.html?tvd

增删改查都需要开启session；参考：http://liusu.iteye.com/blog/380397

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