在 NHibernate 中将双向多对多关系的哪一侧设置为逆关系重要吗？

发布于 2024-08-30 14:20:13 字数 209 浏览 1 评论 0原文

简单的问题：在 NHibernate 中将双向多对多关系的哪一侧设置为逆关系重要吗？如果是这样，将其设置在一端与另一端有何影响？

更多澄清：我正在设置关系的双方：

Parent.Children.Add(child);
Child.Parents.Add(parent);

在这样的情况下，我将哪一方标记为反向有关系吗？

原文

Simple question: does it matter which side of a bidirectional many-to-many relationship you set as the inverse in NHibernate? And if so, what are the implications of setting it on one end vs. the other?

Some more clarification: I'm setting both sides of the relationship:

Parent.Children.Add(child);
Child.Parents.Add(parent);

In a case like this, does it matter which side I mark as inverse?

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酒中人 2024-09-06 14:20:13

是的，这很重要，仅对关联的反向端所做的更改不会持久。

您可以查看 nhibernate 文档以获取更多详细信息。这里有链接：

http://www.nhforge.org/doc /nh/en/#collections-bidirection

编辑

我的答案不会随着您的添加而改变，但我会尽力解释得更好:-)

如果您将 Parent.Children 设置为inverse = true 您需要保存 Child 对象才能保存关系。如果您只保存Parent，那么如果您使用inverse = true设置Child.Parent，则关系将不会被保存，

您需要保存Parent对象才能保存关系。如果您仅保存子级，则不会保存该关系

category.Items.Add(item);  // The category now "knows" about the relationship
item.Categories.Add(category);  // The item now "knows" about the relationship

session.Update(item);    // No effect, nothing will be saved!
session.Update(category);    // The relationship will be saved

Yes it matters, changes made only to the inverse end of the association are not persisted

You may check nhibernate documentation for further details. Here you have the link:

http://www.nhforge.org/doc/nh/en/#collections-bidirectional

EDIT

My answer doesn't change with your addition, but I'll try to explain it better :-)

if you set Parent.Children with inverse = true you need to save Child object in order to save the relation. If you ONLY save Parent then the relation won't be saved

if you set Child.Parent with inverse = true you need to save Parent object in order to save the relation. If you ONLY save Child then the relation won't be saved

category.Items.Add(item);  // The category now "knows" about the relationship
item.Categories.Add(category);  // The item now "knows" about the relationship

session.Update(item);    // No effect, nothing will be saved!
session.Update(category);    // The relationship will be saved

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