RDBMS implementations

So far, both of the data object implementations that we've created have overridden the _create and _update methods that were required in BaseDataObject. It would be fair, under the circumstances, to question why those were put in place at all. The short answer to that question is that both of the implementations that have come together so far use the same process at the data store level for creating and updating records and documents. As a result, they simply haven't been needed. If it was expected that hms_sys would never need any other database backend, we'd be justified in removing them from the entire code base.

However, what would've happened if the decision to use MongoDB had gone a different way, and the preferred ...

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