I'm searching for some books/artices/blog publish/discussions about "Object Techonolgy/Object-Oriented Technology implemented in Relational Database". I must have more overview about history and just how situations are now (mainly MS SQL, DB2, etc).
This really is the best article on Object/Relational Mapping. Valid if this was written, in 2006.
The main one I keep handy includes a foreward which was writtin by James Rumbaugh (among the gang of 4). It's known as Object-Oriented Modeling and Design for Database Applications
Douglas K. Craig an advisor who authored a number of books on object oriented DBs, is collecting lots of articles at this site regarding ORM and some other close subjects. Maybe you will find your infos there