Question

是否在Hibernate开始新的交易,是否实际上将某种联系分配给了亚洲开发银行?

I m涉及b/c我们的服务器开始对收到的每一项请求进行新的交易,即使这一请求与亚洲开发银行没有互动。我们再把非行连接视为主要的瓶颈,因此我很想知道,我是否应当花时间缩小我的交易范围。

在任何地方进行搜捕,没有发现好的答案。非常简单的法典在这里是:

    SessionFactory sessionFactory = (SessionFactory) Context.getContext().getBean("sessionFactory");
    sessionFactory.getCurrentSession().beginTransaction();
    sessionFactory.getCurrentSession().setFlushMode(FlushMode.AUTO);

thanks very much! a

Answer 1

(每篇Pascal Thivent评论更新)

每一条<代码>>><>> /代码”均建立数据库链接,条件是有必要,例如,交易开始。仅仅因为届会的召开,这一联系并不开放。

为克服这种情况,您可使用connecetiongroup,以便重新利用链接。或者,你可以确保(正如你所看到的那样)不自动开始交易。

(. This Discussiones读作的交易。检查。

Answer 2

根据 of the Hibernate documents:

A SessionFactory is an expensive-to-create, threadsafe object, intended to be shared by all application threads. It is created once, usually on application startup, from a Configuration instance.

A Session is an inexpensive, non-threadsafe object that should be used once and then discarded for: a single request, a conversation or a single unit of work. A Session will not obtain a JDBC Connection, or a Datasource, unless it is needed. It will not consume any resources until used.

In order to reduce lock contention in the database, a database transaction has to be as short as possible. Long database transactions will prevent your application from scaling to a highly concurrent load. It is not recommended that you hold a database transaction open during user think time until the unit of work is complete.

现在回答你的问题:

getting a Session does not immediately acquire a connection (the connection is lazy loaded)
but calling beginTransaction() will cause the load of the connection for the given Session
subsequent calls will reuse the same connection

见org.hibernate.impl.SessionImpl#begin Transaction(,并通过该守则提供更多细节。

友情链接