什么是hibernate中的上下文会话？ [英] What is contextual sessions in hibernate?

问题描述

1. 什么是Hibernate中的上下文会话？


2. 当我使用上下文会话实现接口创建和关闭会话时
$ b $将Hibernate的 Contextual Session 想象成一个当前映射的映射。
解决方案会话到用户的上下文。例如：单个事务可以是这样一个上下文，因此如果Hibernate Session的生命周期与该事务的生命周期相匹配，那么Session可以被称为上下文，其中单个事务定义了这样一个上下文。有时这个特定的案例被标记为 session-per-request 模型。





一个Hibernate接口 CurrentSessionContext 可以映射当前会话（例如 SessionFactory.getCurrentSession（））到不同的上下文。这个接口有3个实现：






• JTASessionContext ：当前会话由JTA事务进行跟踪和作用域。这里的处理过程与之前的仅适用于JTA的方法完全相同。详情请参阅Javadocs。

• ThreadLocalSessionContext ：当前会话由执行线程跟踪。详情请参阅Javadocs。

• ManagedSessionContext ：当前会话由执行线程跟踪。但是，您有责任使用此类上的静态方法绑定和取消绑定Session实例：它不会打开，刷新或关闭会话








查看 Architecture Architecture Session 是Hibernate文档的一部分，以获得更多官方的详细信息。




1. What is contextual session in Hibernate?
2. When I created and closed a sessions in between use contextual session implementation interfaces?

解决方案

Think of Hibernate's Contextual Session as a mapping of a current Session to a user's Context.

For example: a single transaction could be such a context, hence if the Hibernate Session's lifecycle matches a life of this transaction, the Session could be called contextual, where a single transaction defines such a context. Sometimes this particular case is labeled as a session-per-request model.

A Hibernate interface CurrentSessionContext is there to map a current session ( e.g. SessionFactory.getCurrentSession() ) to different contexts. This interface has 3 implementations:

• JTASessionContext: current sessions are tracked and scoped by a JTA transaction. The processing here is exactly the same as in the older JTA-only approach. See the Javadocs for details.

• ThreadLocalSessionContext: current sessions are tracked by thread of execution. See the Javadocs for details.

• ManagedSessionContext: current sessions are tracked by thread of execution. However, you are responsible to bind and unbind a Session instance with static methods on this class: it does not open, flush, or close a Session

Take a look at the Architecture Current Session part of the Hibernate documentation for more "official" details.

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