When you use JDO with an existing database, the data conversion (or mapping) from tables to objects and back will be performed between the applications and the database. This is illustrated in the diagram where you see the mapping layer below the JDO interface. The diagram also shows that this mapping will most likely occur in one location. For more information on this data conversion, see the description of the mapping layer.
For more information on Java Data Objects and application servers, see When to Use JDO with Java Application Servers.
Context for JDO Data Conversion
Related Articles for JDO Data Conversion
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.