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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