不同 dao 方法的相同代码包装

发布于 2024-11-14 05:20:03 字数 930 浏览 2 评论 0原文

我正在阅读 hibernate 教程，注意到在每个 dao 中，您都必须获取会话，开始事务。执行所有操作，然后提交

private void createAndStoreEvent(String title, Date theDate) {
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();

        //Perform operations...

        session.getTransaction().commit();
    }

然后我注意到在一个名为 Appfuse 的框架中，它使用 hibernate 有如下所示的 dao 方法。我没有看到begintransaction 和 commit

    public List<Person> findByLastName(String lastName) {
    //begintransaction
        return getHibernateTemplate().find("from Person where lastName=?", lastName);
    //Commit
    }

我想知道 appfuse 如何使用 session.beginTransaction() 和 session.getTransaction().commit() 来包装 dao 操作；

通过使用这种技术，程序员不必担心 hibernate 事务的问题。我希望它以这样一种方式，即使 dao 方法被重写，事务包装器代码也应该自动出现。我尝试过将 dao 传递给装饰器类并将 dao 方法调用包装在装饰器类中。但是由于 dao 接口方法会发生变化，因此这个想法起作用了。我们究竟如何才能实现这一目标。

原文

I was going through the hibernate tutorial and noticed that in every dao you have to get session,begin transaction.Perform all operations and then commit

private void createAndStoreEvent(String title, Date theDate) {
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();

        //Perform operations...

        session.getTransaction().commit();
    }

Then i have noticed in a framework called Appfuse which uses hibernate have dao methods as shown below.I dont see the begintransaction and commit

    public List<Person> findByLastName(String lastName) {
    //begintransaction
        return getHibernateTemplate().find("from Person where lastName=?", lastName);
    //Commit
    }

I wonder how appfuse is wrapping up the dao operations with session.beginTransaction() and session.getTransaction().commit();

By using this technique the programmer doesn't have to bother about hibernate transaction stuff.I want it in such a a way that even if dao methods are overridden the transaction wrapper code should automatically come.
I have tried passing dao to a decorator class and wrapping the dao method call inside decorator class.But since the dao interface methods will change,the idea dint worked.How exactly we can achieve this.

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