sessionfactory.openSession（）和sessionfactory.openStatelessSession（）之间的区别？ [英] difference between sessionfactory.openSession() and sessionfactory.openStatelessSession()?

问题描述

我想知道上面提到的休眠类sessionfactory类的两个方法之间的概念上的区别，如果用简单的例子来说明的话。 前者打开一个正常的（有状态的）会话，而后者打开一个无状态的会话。

根据 Javadoc ，无状态会话是：

用于对数据库执行批量操作的面向命令的API。

无状态会话没有实现一级缓存，也没有与任何二级缓存交互，也没有实现事务性的后写或自动脏检查，也没有将操作级联到关联的实例。集合被无状态会话忽略。通过无状态会话执行的操作绕过了Hibernate的事件模型和拦截器。由于缺乏第一级缓存，无状态会话容易受到数据混叠效应的影响。对于某些类型的事务，无状态会话的执行速度可能比有状态会话。

I want to know the conceptual difference between the above mentioned two methods of the hibernates sessionfactory class if poosible with simple example.

解决方案

The former opens a normal (stateful) session, while the latter (probably not surprisingly) a stateless session.

According to the Javadoc, a stateless session is:

A command-oriented API for performing bulk operations against a database.

A stateless session does not implement a first-level cache nor interact with any second-level cache, nor does it implement transactional write-behind or automatic dirty checking, nor do operations cascade to associated instances. Collections are ignored by a stateless session. Operations performed via a stateless session bypass Hibernate's event model and interceptors. Stateless sessions are vulnerable to data aliasing effects, due to the lack of a first-level cache.

For certain kinds of transactions, a stateless session may perform slightly faster than a stateful session.

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