Henk,
our current implementation of polymorphism only supports the tabel per
class mapping as stated by Werner. Having said that we intend to improve
that in the future to also support mapping per concrete class (what you
wanted) and mapping per class hierarchy (all goes into one table).
It's also important for you to know that the polymorphism support is
quite new and not included in 0.9.7 release. If you like to use that
feature you will need to work with a CVS snapshoot until we release
0.9.9 within a 2 week timeframe.
Ralf
Werner Guttmann schrieb:
Henk,
I think there's no way you can map the classes as layed out by you to your
table setup. Given that I have recently added support for polymorphism, the
only way to go about this decently is a setup where you have three tables, one
for Persistent classes, one for Persons and one for Addresses, wich all common
fields going into Persistent.
Werner
-----Ursprüngliche Nachricht-----
Von: Henk van Voorthuijsen [mailto:[EMAIL PROTECTED]
Gesendet: Montag, 08. August 2005 15:45
An: [email protected]
Betreff: [castor-user] [JDO] How to handle subclassing to common fields?
Given the following set of classes (assume the appropriate getter/
setter methods):
abstract class Persistent
{
String _entryName;
Date _entryDate
}
class Person extends Persistent
{
String personId
String _firstName;
String _lastName;
}
class Address extends Persistent
{
String addressId
String _city;
String _street;
}
and the following tables:
Person
{
personid
entryname
entrydate
firstname
lastname
}
Address
{
addrid
entryname
entrydate
city
street
}
How do I set up a mapping without having to specify the common fields
for both classes?
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