如何在Struts2 + Hibernate Web App中跨多个dao方法使用同一会话对象? [英] How to use same session object across multiple dao methods in struts2+hibernate web-app?

问题描述

为了简单起见，我在下面的代码中省略了许多细节.
我的实现正确吗?
此实现有任何弊端吗?
有没有更好的方法来实现呢?

I have omitted many details from the code below just to keep it simple.
Is my implementation right?
Is there any downside of this implementation?
Is there a better way of implementing the same?

MyAction.java

class MyAction {
  public String execute() {
    Session session = sessionFactory.openSession();
    Transaction tx = session.beginTransaction();

    try {

      UserLoginDAO uldao = new UserLoginDAOImpl();
      uldao.firstMethod(session);
      List l = uldao.secondMethod(session);
      tx.commit();

    } catch(HibernateException ex) {
      if(tx != null) tx.rollback();
    } finally {
      session.close();
    }
    //statements
  }
}

UserLoginDAOImpl.java

class UserLoginDAOImpl implements UserLoginDAO{
  public void firstMethod(session) {
    //statements
    session.save(something);
  }

  public List secondMethod(session) {
    //statements
    List lst = session.createQuery("something").list(); 
    //statements
  }
}

UserLoginDAO.java

interface UserLoginDAO {
  public void firstMethod(session);
  public List secondMethod(session);
}

推荐答案

我的实现对吗?

Is my implementation right?

这是题外话.顺便说一句，看起来不错.

This is off-topic here. BTW it seems fine.

此实现是否有缺点?

Is there any downside of this implementation?

此实现称为视图中开放会话(OSIV)模式"，通常称为 Anti -Pattern.

This implementation is called Open Session In View (OSIV) Pattern, often referred as Anti-Pattern.

有优点和

是否有更好的方法来实现?

Is there a better way of implementing the same?

更好是主观的，因此说哪个比主要基于意见的哪个更好.

Better is subjective, hence saying which is better than which other would be primarily opinion based.

分开更好"并回答还有其他处理事务的方式":从JAVA EE 6开始，事情发生了明智的改变……如果您正在使用它，则将Hibernate用作JPA2实现(相反，作为原始的Hibernate)，然后看看EJB3.1(或带有Interceptor的CDI)中的EntityManager和容器管理的事务.

Leaving the "better" apart and answering just to "are there other ways to handle transactions": from JAVA EE 6, things are changed sensibly... if you are using it, then use Hibernate as JPA2 implementation (instead that as raw Hibernate) and take a look at EntityManager and container managed transaction in EJB3.1 (or CDI with Interceptor).

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