Re: Mapping fields to subclasses in XML schema

[Travis McCauley]

I asked a similar question last Wednesday and also got no replies. 
I've also seen similar questions unanswered in the archives. I don't 
think it's possible to map this in the schema. If it was, either 
someone would say or it would be in the tutorial.

I set up a simple interface to maintain the subclass-to-column 
relationships. If a subclass tries to access an inappropriate field I 
just throw an exception. I also had to override the copy() method to 
allow casting back to the subclass.

Please someone let us know if there is an easier way.

Sincerely,
Travis McCauley
Snowy Virginia



I don't suppose anyone can enlighten me on the below message? I 
didn't hear from anyone. Sorry for the spam, I won't ask again. ;)

Gabe

Gabriel Bauman wrote:
Hi there. I understand that classes and their subclasses are mapped 
onto a single table under Torque. What I don't understand is how to 
specify that a field should only be retrieved in a subclass.

=====
public class SuperClass
{
   public int FOO;
}
public class SubClass extends SuperClass
{
   public int BAR;
}
=====
<table name="superclass" javaName="SuperClass">
  <column name="FOO" type="int" />
  <column name="BAR" type="int" />
  <column name="inheritance" inheritance="single" type="CHAR">
    <inheritance
       class="SubClass"
       extends="SuperClass"
       key="A"
       />
  </column>
</table>
=====
I want to be sure that field BAR does not exist in instances of 
SuperClass, given the fact that they're both mapped on the same 
table. How should my XML schema look in this situation? I must be 
missing something simple here.

Thanks in advance...

Gabe

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