如何关闭NHibernate的自动(脏检查)更新行为? [英] How to turn off NHibernate's automatic (dirty checking) update behaviour?

问题描述

我刚刚发现，如果我从NHibernate会话中获取对象并更改对象的属性，则NHibernate会在提交时自动更新对象，而无需我调用Session.Update(myObj)！

I've just discovered that if I get an object from an NHibernate session and change a property on object, NHibernate will automatically update the object on commit without me calling Session.Update(myObj)!

我可以看到这有什么用，但作为默认行为，这似乎很疯狂！

I can see how this could be helpful, but as default behaviour it seems crazy!

更新:我现在了解持久性无知，因此现在显然是首选的选择.我将在这里留下这个令人尴尬的问题，希望对其他亵渎用户有所帮助.

Update: I now understand persistence ignorance, so this behaviour is now clearly the preferred option. I'll leave this now embarrassing question here to hopefully help other profane users.

如何阻止这种情况发生?这是默认的NHibernate行为还是来自Fluent NHibernate的AutoPersistenceModel?

How can I stop this happening? Is this default NHibernate behaviour or something coming from Fluent NHibernate's AutoPersistenceModel?

如果没有办法阻止这种情况，该怎么办?除非我没有指出这一点，否则这种行为似乎会造成混乱.

If there's no way to stop this, what do I do? Unless I'm missing the point this behaviour seems to create a right mess.

我正在使用NHibernate 2.0.1.4和2009年3月18日发布的Fluent NHibernate版本

I'm using NHibernate 2.0.1.4 and a Fluent NHibernate build from 18/3/2009

这个人对吗?他的回答?

我还读到，重写事件监听器可以解决此问题.但是，在这种情况下不会调用IDirtyCheckEventListener.OnDirtyCheck.有人知道我需要覆盖哪个监听器吗?

I've also read that overriding an Event Listener could be a solution to this. However, IDirtyCheckEventListener.OnDirtyCheck isn't called in this situation. Does anyone know which listener I need to override?

推荐答案

您可以将Session.FlushMode设置为FlushMode.Never.这将使您的操作明确

You can set Session.FlushMode to FlushMode.Never. This will make your operations explicit

即:在tx.Commit()或session.Flush()上.当然，这仍然会在提交/刷新后更新数据库.如果您不希望出现这种情况，请调用session.Evict(yourObj)，它将变为瞬态，并且NHibernate不会为此发出任何db命令.

ie: on tx.Commit() or session.Flush(). Of course this will still update the database upon commit/flush. If you do not want this behavior, then call session.Evict(yourObj) and it will then become transient and NHibernate will not issue any db commands for it.

回复您的是的，那个家伙为您提供了更多控制方式的选择.

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