I cannot find a structure that complements an OOP approach that encapsulates the implementation of the database

Seems like you're describing the Object-relational impedance mismatch.

There are number of things that are supposed to solve this OODBMS, ORM tools, a host of data access tools.

I think the fact that there's so many solutions leads me to believe that One True Solution™ doesn't exist.

So you can pick any direction you like secure in the knowledge that some people will hate it and some will love it.

I cannot find a structure that complements an OOP approach that encapsulates the implementation of the database

Seems like you're describing the Object-relational impedance mismatch.

There are number of things that are supposed to solve this OODBMS, ORM tools, a host of data access tools.

I think the fact that there's so many solutions leads me to believe that One True Solution™ doesn't exist.

So you can pick any direction you like secure in the knowledge that some people will hate it and some will love it.