Andre,
Since Cayenne doesn't currently support this, I just model the two
tables separately and create a relationship between the subclass and
superclass. Then I add cover methods in the subclass to return
toSuperClass.whatever(), which simulates things "correctly". Of course,
this is for reading, only. You can add cover methods for setting
attributes, too. You also have to more manually manage creating them,
too, since you need to create both at the same time (although this can
be automated a bit in the subclass using the setPersistenceState()
method and if the state is NEW, create/insert the superclass, too).
The cover methods/etc aren't really required, but they make the code
using the business objects a bit nicer.
/dev/mrg
-----Original Message-----
From: Andre Bremer [mailto:a.breme..olff-olins.com]
Sent: Tuesday, February 01, 2005 8:35 AM
To: cayenne-use..bjectstyle.org
Subject: Inheritance using two tables
Hi
How does one map an associated database schema?
Where we have one base table representing the super class and any number
of other tables representing the concrete sub classes.
I understand the documentation of single table inheritance but can't
find any help on the above.
Also I can't search the mail archive, am I missing something?
cheers
as
* * * * * * * * * * * * * * * * * * * * * * * * * * * *
This e-mail message is intended solely for the person to
whom it is addressed and may contain confidential or
privileged information. If you have received it in error,
please notify the postmaste..olff-olins.com
immediately and destroy this e-mail and any attachments.
In addition, you must not disclose, copy, distribute or take
any action in reliance on this e-mail or any attachments.
Any views or opinions presented in this e-mail are solely
those of the author and do not necessarily represent
those of Wolff Olins. E-mail may be susceptible to
data corruption, interception, unauthorised amendment,
viruses and unforeseen delays, and we do not accept
liability for any such data corruption, interception,
unauthorised amendment, viruses and delays or the
consequences thereof.
Accordingly, this e-mail and any attachments
are opened at your own risk.
http://www.wolff-olins.com
* * * * * * * * * * * * * * * * * * * * * * * * * * * *
This archive was generated by hypermail 2.0.0 : Tue Feb 01 2005 - 09:54:10 EST