Henk, polymorphism in Castor JDO will solely be expressed through the 'extend' relationship.
Werner Henk van Voorthuijsen wrote: > That is very unfortunate. Not only does this force me to keep separate > mapping files for SQL and XML mapping, I also have to copy/ paste the > common field descriptors over every table in the database. > I am pleased to hear about the upcoming release, however. Will the > syntax be similar to polymorphism in XML binding? > > regards, > > Henk van Voorthuijsen > >> 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? >>> ------------------------------------------------- >>> If you wish to unsubscribe from this list, please send an empty >>> message to the following address: >>> [EMAIL PROTECTED] >>> ------------------------------------------------- >>> ------------------------------------------------- >>> If you wish to unsubscribe from this list, please send an empty >>> message to the following address: >>> [EMAIL PROTECTED] >>> ------------------------------------------------- >>> >> >> ------------------------------------------------- >> If you wish to unsubscribe from this list, please send an empty >> message to the following address: >> >> [EMAIL PROTECTED] >> ------------------------------------------------- >> >> >> > > > ------------------------------------------------- > If you wish to unsubscribe from this list, please send an empty message > to the following address: > > [EMAIL PROTECTED] > ------------------------------------------------- > > ------------------------------------------------- If you wish to unsubscribe from this list, please send an empty message to the following address: [EMAIL PROTECTED] -------------------------------------------------
