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From Andy Law <andy....@roslin.ed.ac.uk>
Subject How would you - the experts - design this?
Date Mon, 25 Jan 2010 09:58:00 GMT

We have built an application using iBatis to act as the interface between
code and database (no, really :o}). As you would expect with such a
magnificent tool, it works well.

We have a different application that we are starting to ramp up. It uses the
same data model for the most part with the same mappings from schema to
model. In fact, it actually uses the same database instance -  the datasets
for each application are overlapping.

I'd like to maintain a single copy of the code with a single set of SQLMaps
where possible but be able to generate a jar file that will pull out some of
the data with extra "where xyz = 'abc'" type constraints. What is the best
way of doing this in your experience?

To flesh out what I have described so poorly above, imagine that I have data
from "populations" A, B and C. Application 1 needs to see data from A and B.
Application 2 needs to see data from B and C. There is a "roles" table and a
"populations_to_roles" table doing the many_to_many stuff and I'd like to be
able to do all this from a single jar. FWIW, we're using maven as our build
and management tool.

Our objects are extracted via DAOs, which come from a singleton DAOFactory.
My current thoughts are along the lines of injecting attributes into the
DAOFactory that are then subsequently dumped into the DAOs that it

Thanks in advance for any help, ideas or discussion points that you can



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