I've updated the comparision demo. I factored out the code into a
generic report class and a database-specific model class, making it
easy to see how equivalent operations are handled in different
databases. The queries are a bit more realistic.  I also made the
Durus Flintstone class persistent, which will make David happy.

http://sluggo.scrapping.cc/python/comparative-databases-demo/

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Mike Orr