This is not to imply this is the only, best or simplest solution, but pragmatically it is one of the most common, and one that has the potential for the most misuse.
This article is about only one of those choices, that is the layering of an object-oriented class model on top of a purely relational database. From the vendor aspect Oracle, IBM, Microsoft, POET and others offer similar but often-incompatible solutions. From the technological perspective, the choice is usually between pure Object-Oriented, Object-Relational hybrids, pure Relational and custom solutions based on open or proprietary file formats (eg. When it comes to providing reliable, flexible and efficient object persistence for software systems, today's designers and architects are faced with many choices.
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