The question of persistence implementation arise often. I found repository pattern very valuable due to separation of concerns, mediate between domain model and data source (mock, file, database, web service, etc).
The database data source is somewhat specific since you can proceed with SQL functions or ORM. Here are some thoughts why you might prefer SQL functions over ORM in your next project: http://mindref.blogspot.com/2013/02/sql-vs-orm.html Comments or suggestions are welcome. Thanks. Andriy Kornatskyy -- http://mail.python.org/mailman/listinfo/python-list
