Spring 3.0 和 Hibernate 3.5 与上下文会话的集成

Question

我非常了解hibernate，并且相当了解Spring核心，我可以使用hibernate模板和hibernate dao支持类来集成两者，但是从hibernate 3.1开始，我们有上下文会话，即我们不需要使用hibernate模板和hibernate dao支持但是当我试图与这个概念集成并在我的 dao 类中注入 sessionFactory 时，一切都会写，但我试图插入数据休眠显示插入查询但数据未保存到数据库中，请帮助我我能做什么。 这是我的代码

@Transactional
 public class UserDAO {

SessionFactory sessionFactory;

public void save(User transientInstance) {
    try {
        sessionFactory.openSession().save(transientInstance);
    } catch (RuntimeException re) {
        throw re;
    }
}
public static UserDAO getFromApplicationContext(ApplicationContext ctx) {
    return (UserDAO) ctx.getBean("UserDAO");
}
public SessionFactory getSessionFactory() {
    return sessionFactory;
}
public void setSessionFactory(SessionFactory sessionFactory) {
    this.sessionFactory = sessionFactory;
}
}

这是我的 beans.xml

<bean id="sessionFactory"  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
   <property name="configLocation" value="classpath:hibernate.cfg.xml"></property>
</bean>

<bean id="UserDAO" class="dao.UserDAO">
   <property name="sessionFactory"><ref bean="sessionFactory" /></property>
 </bean>

这是我的主要代码

ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
User user=new User("firstName", "lastName", "address", "phoneNo", "mobileNo", "email", "password", false, null);
SessionFactory factory=(SessionFactory)context.getBean("sessionFactory");
Session session=factory.openSession();
Transaction tx=session.beginTransaction();
UserDAO ud=(UserDAO)context.getBean("UserDAO");
ud.save(user);      
tx.commit();
session.close();

Answer 1

你的代码有几个问题，

1. DAO 已经是事务性的，由 Spring 管理。您正在 main 中开始另一笔交易。
2. 您打开会话两次。一次在 main 中，另一次在 dao 中。
3. 当您使用上下文会话时，最好拨打sessionFactory.getCurrentSession()

现在如果你用Spring正确配置了事务管理器，下面的代码就可以了，我只是添加了一些cmets，看看对你有没有帮助:)

@Transactional
 public class UserDAO {

SessionFactory sessionFactory;

public void save(User transientInstance) {
   //Removed try-catch. It was just catching RuntimeException only to re throw it
   sessionFactory.openSession().save(transientInstance);

}
//I would get rid of this method.  
public static UserDAO getFromApplicationContext(ApplicationContext ctx) {
    return (UserDAO) ctx.getBean("UserDAO");
}
//I would get rid of this method or make it private  
public SessionFactory getSessionFactory() {
    return sessionFactory;
}
public void setSessionFactory(SessionFactory sessionFactory) {
    this.sessionFactory = sessionFactory;
}
}

主要代码

ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
//I would use builder instead of constructor here
User user=new User("firstName", "lastName", "address", "phoneNo", "mobileNo", "email", "password", false, null);

UserDAO ud=(UserDAO)context.getBean("UserDAO");
ud.save(user);