流利的Nhibernate-将两个实体映射到同一张表

Question

I'm trying to map two domain entities to the same table. We're doing a smart entity for our domain model, so we have the concept of an Editable Address and a readonly Address. I have both mapped using Classmaps, and everything seems to go fine until we try to export the schema using the SchemaExport class from NHibernate. It errors out saying the table already exists.

I assume it's something simple that I'm just not seeing.

Any ideas?

Thanks

Update

There are a couple of other things I didn't mention which I should have. I appreicate those that answered so far, but they don't work for us.

One is that we have a single address table, not include the columns in whatever entities have an address.

The other is that we can't use a common base class. For editable objects, we have a super class which adds validation behaviors to the subclasses. The readonly objects don't need this behavior though and should not have these behaviors.

I have considered an interface, but then I believe I end up in a situtation where you can cast a readonly object to this interface and then changes its values (since presumably NHibernate would use said interface to hydrate the object).

So if there's another way to acomplish this, or if mapping via an interface won't have the problem I described, please let me know. I'm still learning NHibernate.

Thanks again!

Answer 1

you can Exclude the readonly class from schemaexport:

public class ReadonlyAdressMap : ClassMap<ReadonlyAdress>
{
ReadonlyAdressMap()
{
    Schemaaction.None();
    [...]
}
}

Answer 2

创建一个基本抽象类实体，稍后将其扩展到“可编辑地址”和“只读地址”。