The final step in constructing the class hierarchy is to add method code. You can find the methods by inspecting the programming code that processes the type data. See programming code that uses type codes.
In this example, an Age method was found to apply to everyone in the database. It used the Date of birth and today's date to calculate age. The diagram below shows the Age method attached to the Person class. Also, a method for hiring a new employee is shown along with the method for granting tenure to a professor. There are undoubtedly other methods that can be found. You might also find a different method is necessary for hiring a workstudy person so that the method could be further defined for the Workstudy Class.
Next: Using the data. Also see the related content below.
More on the general topic: Using Existing Relational Schema
- Type Codes
- Using Type Codes to Construct Classes
- Multi-Type Views
- Checking the Class Hierarchy
- Using the Data
Related Fact Book
Author: Douglas K Barry
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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.