When you use SQLJ with existing databases, the data conversion (or mapping) from tables to objects and back must be performed in the application or the application server. This is illustrated in the diagram where you see the mapping layer above the JDBC interface. SQLJ sits on top of JDBC. The diagram also shows that this mapping may also occur in multiple locations. For more information on this data conversion, see the description of the mapping layer and mapping SQL and Java data types.
Context for SQLJ Data Conversion
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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.