"The POID should be unique inside a class hierarchy or, even better, inside your domain." This statement is leaky. The domain should not care about POID, at all, POID is a storage concern. Not a business concern. I have a longer argument on my old blog about this: http://www.lowendahl.net/showShout.aspx?id=103
"A POID should refer uniquely one, and only one, entity instance." Yes, but there is nothing that says that there can't be several entities that store their POID in the same table. See my response to Anne for a bit more info on the last statement. -- Patrik Löwendahl http://blog.lowendahl.net http://twitter.com/lowendahl On Wed, Sep 30, 2009 at 5:35 PM, Fabio Maulo <[email protected]> wrote: > ORM (object relational mapping):The POID should be unique inside a class > hierarchy or, even better, inside your domain. > A POID should refer uniquely one, and only one, entity instance. > > How look your domain? > > 2009/9/23 Patrik Lowendahl <[email protected]> > > Is there any plans on supporting joins mapping on any other column then the >> class PK? >> >> I see a lot of legacy where they have used arbitrary columns as the FK, >> like this example: >> >> [Person] >> PersonId >> >> [AdPerson] >> PersonId >> ObjectSID >> >> [User] >> ObjectSID >> >> Doing a projection over this (UserInfo) becomes bothersome and the >> simplest solution would be something like: >> >> <class name="AdPerson"> >> ... >> <join table="Person"> >> <key column="PersonId" /> >> ... >> </join> >> <join table User> >> <key column="ObjectSID" foreign-key="ObjectSID" /> >> --- >> >> For the record, I don't agree with the database model, but this is what I >> have to work with and a construct like the above would make it a lot more >> easy to manage. >> >> -- >> Patrik >> >> > > > -- > Fabio Maulo > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "nhusers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nhusers?hl=en -~----------~----~----~----~------~----~------~--~---
