Application ID From superclass?

Question

If I have the followign structure:
class Foo {
String id;
class Bar extends Foo {
// .. other stuff
is it possible for me to use the id field of Foo as the application id for bar?
EG:
<class name="Foo" objectid-class="java.lang.String">
<field name="id" primary-key="true"/>
</class>
<class name="Bar" persistence-capable-superclass="Foo"
objectid-class="java.lang.String">
<field name="id" primary-key="true"/>
</class>
I have a big structure where I have accounts and they all have an account id and
thus I want the ID in the base class instead of the derived classes. However I
dont want to have a diferent primary key for each class if I can avoid it.
-- Robert

Answer 1

Hmm, yes, I see that String violates the rules. how inconvenient. However
Integer should be legal to use, right? I don't particularly want to spend a
horrid amount of time designing primary key classes.
-- Robert
"Stephen kim" <[email protected]> wrote in message
news:[email protected]..
Actually they -should- share the same object-id class.
See the documentation regarding rules for application identity at:
http://solarmetric.com/Software/Documentation/2.4.3/docs/jdo_overview_pc_identity.html
>
In addition, note that you cannot for the above reason use
java.lang.String as the objectid-class. Try using the ApplicationIdTool
to generate some base object id classes.
Also, to prevent future pain, each PersistenceCapable hierarchy must have
a different object-id class. I.e.
person->employee->salaried
->hourly
All must share a same id class (say PersonId)
but Company->MultiNationalCorporation requires a seperate class (say
CompanyId).
However, CompanyId and PersonId can both derive from a base class to
simplify some other things if you wish.
On Tue, 27 May 2003 09:08:11 +0200, Robert Simmons wrote:
If I have the followign structure:
class Foo {
String id;
class Bar extends Foo {
// .. other stuff
is it possible for me to use the id field of Foo as the application id for
bar?
EG:
<class name="Foo" objectid-class="java.lang.String">
<field name="id" primary-key="true"/>
</class>
<class name="Bar" persistence-capable-superclass="Foo"
objectid-class="java.lang.String">
<field name="id" primary-key="true"/>
</class>
I have a big structure where I have accounts and they all have an account idand
thus I want the ID in the base class instead of the derived classes. HoweverI
dont want to have a diferent primary key for each class if I can avoid it.
-- Robert--
Steve Kim
[email protected]
SolarMetric Inc.
http://www.solarmetric.com