Re: extents, mapping classes to joined tables and collection-type field

[Maxim Kuleshov]

On Thu, 29 Jan 2009 15:18:14 +0300
Maxim Kuleshov <kules...@org.vrn.ru> wrote:

> That's scheme gives me error during XDoclet stage:
> 
> "The collection entries in class ojbs.ObjsList specifies a foreignkey
> listId that is not a persistent field in the element class (or its
> subclass) objs.B"

Well, this problem has been solved. The answer is I mixed up extents and
multiple-joined tables concepts.

But another problem still persists. Then storing instance of classB
its foreign key to classA (prentId), declared as anonymous is not
set automatically, so reference between table_a and table_b is lost and
when loading classB all fields declared in classA are nulls.

The only way to preserve references is to use primary key of classB
(id) as a foreign key to classA. But how to force sequence-manager
generate its value only once (if every class has its own instance of
id).

I use XDoclet, and it doesn't allow to inherit particullar field.
Moreover, it doesn't allow to ignore duplicate fields, as listId among
then and class ObjsList has collection back-referencing via that field.

If I put obj.field declaration with name attribute it always become
anonymous (which is not true).



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