Re: ojb 1.1: Discriminator-descriptor issue

[Jakob Braeuchi]

hi martin,
is the discriminator also wrong when the classes are mapped to separate 
tables ?
ojb has some issues with multi-mapped tables and armin is working on a 
testcase.

jakob
Martin Taal schrieb:
Hi,
When I have a class hierarchy mapped to multiple (joined) tables then I
am not sure how to use the discriminator-descriptor. At least in the way
I try it it doesn't work.
An example I have a class A and its subclass B.
A is stored in table A and the subclass part of B is stored in table B. 
So get B a join has to be made between tables A and B.

In A I have a discriminator field (specified in the 
discriminator-descriptor).

I store one A and one B object creating two records in the A table and 
one in the B table. This is correct. The discriminator field in the A 
table however only contains the classname of A (for both records). This 
I think is not correct, for the B record it should contain the classname 
of B.

Also when I then retrieve all A objects I get two objects both of type A 
while one of the A object should actually be an instance of B.

Btw, in the case that I store the classhierarchy in one table then the 
above works fine.

As I am looking at the 1.1 branche I am not sure if this part is yet 
completely finished?
Maybe also my setup maybe wrong, see the repository.xml here:

<!-- class: org.elver.store.test.testcasesimple2.A in table: A -->
<class-descriptor class="org.elver.store.test.testcasesimple2.A" table="A">
    <discriminator-descriptor column="A_classname" jdbc-type="VARCHAR" 
value="org.elver.store.test.testcasesimple2.A"/>

    <field-descriptor  name="name" column="name" jdbc-type="VARCHAR" 
nullable="true"/>
    <field-descriptor  name="ID" column="ID" jdbc-type="INTEGER" 
primarykey="true" autoincrement="true" access="anonymous"/>

</class-descriptor>
<!-- class: org.elver.store.test.testcasesimple2.B in table: B -->
<class-descriptor class="org.elver.store.test.testcasesimple2.B" table="B">
    <discriminator-descriptor column="B_classname" jdbc-type="VARCHAR" 
value="org.elver.store.test.testcasesimple2.B"/>

    <field-descriptor  name="nameb" column="nameb" jdbc-type="VARCHAR" 
nullable="true"/>

    <field-descriptor  name="A_ID" column="A_ID" jdbc-type="INTEGER" 
primarykey="true" access="anonymous"/>

    <reference-descriptor name="super" 
class-ref="org.elver.store.test.testcasesimple2.A" auto-retrieve="true" 
auto-update="true" auto-delete="true">
        <foreignkey field-ref="A_ID" />
    </reference-descriptor>

</class-descriptor>
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