Nhibernate不将parentid插入子级 [英] Nhibernate not inserting parentid into child

问题描述

我手头有一个奇怪的问题.首先看看我的表架构.

I have a weird problem at hand. First have a look at my table schema.

A(ID) B(ID，AID) C(ID，AID) D(ID，CID)

A(ID) B(ID,AID) C(ID,AID) D(ID,CID)

地图文件如下:

MAP A
{
HasMany(x => x.B).Cascade.AllDeleteOrphan().Inverse().KeyColumn("AID");
HasMany(x => x.C).Cascade.AllDeleteOrphan().Inverse().KeyColumn("AID");
}

MAP B
{
References(x => x.A).Column("AID");
}

MAP C
{
References(x => x.A).Column("AID");
HasMany(x => x.D).Cascade.AllDeleteOrphan().Inverse().KeyColumn("BID");
}

MAP D
{
References(x => x.C).Column("CID");
}

在A上执行SaveORUpdate/Merge时，它不会将AID插入到B和C中.但是，它确实将CID插入到D中.任何建议.

While doing SaveORUpdate/Merge on A it doesn't insert AID into B and C. But it does insert CID into D. Any suggestions.

推荐答案

如果发生这种情况，您肯定会错过分配关系的双方.如果可以的话:

If this happens, you for sure missed to assign both sides of relation. If this would be in place:

var parent = ...;
var child = ...;
parent.Children.Add(child);
child.Parent = parent;

一切正常.因为这里最令人怀疑的是您的代码是这样的:

All will work. Because the most supsected here is that your code is like:

var parent = ...;
var child = ...;
parent.Children.Add(child);
// child.Parent = parent; // this is missing

，并且不会插入子代.为什么?

and that won't insert children. Why?

因为我们使用了 .Inverse() 映射.这是一个非常强大但又脆弱的设置.它允许NHibernate进行一些重要的优化，但这需要-必须在子级中设置PARENT .

查看这篇不错的文章

Inverse ="true"示例和说明 由mykong

Inverse = "true" example and explanation by mykong

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