I�m a very new comer to this technology and don�t have clear idea about persistence layer. So I decided to ask some question to this group and hopefully get a reply.
Now I�m using the JDBC API for the development. I�m handling a large database with simple JDBC and have to generate reports continuously, which also contains lot of data as its contents. But I want to use the Persistence layer and I choose to use the OJB. I�m also using struts for my application development.
First of all, I have to know the basics.
� Do I have to create classes for all the Tables of my database?
� I have to use JOIN in my query to get the results from the database, do I have to create class for the joining in OJB?
� OJB doesn�t provide the aggregate function, how this could be solve in OJB?
� What about the performance when handling large database and what about the memory requirements?
� Between the Persistence Broker, ODMG, JDO which one I should use and why?
Any suggestion on these questions will be highly appreciable.
Thank you,
Mahbub
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