creationDate and lastUpdate for classes

[Tino Schöllhorn <t....@tiscali.de>]

Hi,

I am successfully using OJB rc5 and I really appreciate this tool. Now I 
want to extend my data-model so that I have 2 additional fields:

- creationDate: the date the object/row was created
- lastUpdate: the date the object/row was last updated

Currently we are using MySQL as database, but we don't want to use any 
database-specific functions so that I have to implement it myself.

I identified several cases and one I can't imagine how to solve the 
maintainence of my two dates.

1.) "Normal Object": say I have class A. via the interface 
PersistenceBrokerAware I can easily set "creationDate" and "lastUpdate" 
to the correct values.

2.) Decomposed NM-Relation between class A and B via class AC: well this 
is just another case of 1.)

3.) Non-Decomposed NM-Relation between class A and B: This is the case 
which puzzles me: is it possible to implement a callback mechanism or 
something like that, when inserting or updating this relationship?

I would really be glad for any help!

Tino



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