[英]nhibernate (or hibernate) Conditional cascading
I have a class User, that has a property Event, which has many Sessions. 我有一个User类,它具有一个Event事件属性,其中包含许多Sessions。 Basically, a user register to an event which have many sessions hours.
基本上,用户注册具有多个会话时间的事件。
The user can register for an event, but the sessions hours are purely informative. 用户可以注册一个事件,但是会话时间纯粹是提供信息。
But when I write a user to the database with NH, it updates the sessions hours too. 但是,当我用NH将用户写入数据库时,它也会更新会话时间。 How can I prevent that, knowing that I still need the sessions hours to be inserted/updated when I create/update an event.
我知道在创建/更新事件时仍需要插入/更新会话时间,因此如何避免这种情况。
This might not totally apply to your question, but I've had issues where I wanted to conditionally cascade deletes based on certain business rules. 这可能并不完全适用于您的问题,但是我遇到了一些问题,我想根据某些业务规则有条件地级联删除操作。
A lot of the times, you can handle this in your persistence logic. 很多时候,您可以在持久性逻辑中进行处理。 I had a case where I went with NHibernate Event Listeners.
我曾经遇到过NHibernate事件监听器的情况。
public class ConditionalDeleter: IPostDeleteEventListener
{
public void OnPostDelete(PostDeleteEvent @event)
{
var foo = @event.Entity as Foo;
if (foo != null)
{
if (foo.ShouldDeleteBar)
{
ISession session = @event.Session.GetSession(EntityMode.Poco);
session.Delete(foo.Bar);
session.Flush();
}
}
}
}
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