dear all,
i ve got a few question on how 'extends' is used in Castor JDO.
it seems that:
1. i have class B extends class A, both are cached.
2. i first load an instance of class A, (e.g. db.load(A.class, id))
3. load an instance of class B but with the same identity, (e.g.
db.load(B.class, id))
the object returned in the second load will be of class A (but what i expect is
an object of type class B).
i tried to load an object of class B alone and it seems to work just fine.
is this the intended behaviour / what i think is incorrect ?
also in castor, can i have, let say:
1. class B, C, and D all extends class A (A maps to table TAB_A)
2. B, C and D all mapped to the same table (table TAB_BCD).
3. row in table TAB_BCD can be distinguished into class B, C or D depends on the
value in one of the column in the table (say, there is a column named
'CLASS_TYPE', if CLASS_TYPE = 'B' then the row representing an object of class B
and so forth).
is there anyway in doing the above in Castor?
regards,
dave
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