Type codes provide a good place to start creating a class hierarchy as you consider converting the data definition from a relational to an object schema. A class hierarchy in an object schema takes the place of type codes in a relational schema. In the object model, type codes are known and "understood" as the class hierarchy. In a relational schema, type codes are embedded in the data and are not actually "understood" by the relational DBMS. This section will illustrate how type codes can be used to construct a class hierarchy.
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The Savvy Manager's Guide
Douglas K Barry is also the author of a book that explains Web Services, service-oriented architecture, and Cloud Computing in an easy-to-understand, non-technical manner.
Web Services, Service-Oriented Architectures, and Cloud Computing: The Savvy Manager's Guide (Second Edition)
by Douglas K Barry with David Dick
This is a guide for the savvy manager who wants to capitalize on the wave of change that is occurring with Web Services, service-oriented architecture, and—more recently—Cloud Computing. The changes wrought by these technologies will require both a basic grasp of the technologies and an effective way to deal with how these changes will affect the people who build and use the systems in our organizations. This book covers both issues. Managers at all levels of all organizations must be aware of both the changes that we are now seeing and ways to deal with issues created by those changes.