HIbernate符合Java习惯的关系数据库持久化之SessionFactory

iteye_242

于 2010-02-01 22:08:32 发布

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分类专栏： Java-Hibernate 文章标签： Hibernate Java thread XML

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本文解释了SessionFactory.getCurrentSession()方法的功能及其在Hibernate中的作用。该方法返回当前的工作单元，并且由于配置选项设置为thread，当前工作单元的上下文绑定到执行应用程序的当前Java线程。文章还介绍了如何开始和结束一个会话，以及如何跟踪当前会话的三种方法。

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What does sessionFactory.getCurrentSession() do? First, you can call it as many times and anywhere you like once you get hold of your org.hibernate.SessionFactory . The getCurrentSession() method always returns the "current" unit of work. Remember that we switched the configuration option for this mechanism to "thread" in our src/main/resources/hibernate.cfg.xml ? Due to that setting, the context of a current unit of work is bound to the current Java thread that executes the application.

当前线程

重要

Hibernate offers three methods of current session tracking. The "thread" based method is not intended for production use; it is merely useful for prototyping and tutorials such as this one. Current session tracking is discussed in more detail later on.

3个方法

A org.hibernate.Session begins when the first call to getCurrentSession() is made for the current thread. It is then bound by Hibernate to the current thread. When the transaction ends, either through commit or rollback, Hibernate automatically unbinds the org.hibernate.Session from the thread and closes it for you. If you call getCurrentSession() again, you get a new org.hibernate.Session and can start a new unit of work.

新会话