Using Type Codes to Construct Classes
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.
Next: Support View. Also see the related content below.
More detail for the current topic: Using Type Codes to Construct Classes
- Support View
- Support Class
- Professor View
- Professor Class
- Instructor View
- Instructor Class
- Workstudy View
- Workstudy Class
- Tentative Classes
More on the general topic: Using Existing Relational Schema