Chapter 9 Working with Data Models
The following PDM model checks are made on abstract data types:
| Check | Description and Correction |
|---|---|
| Abstract data type name and code uniqueness | Abstract data type names and codes must be unique in the model.
Manual correction: Modify the duplicate name/code Automatic correction: Appends a number to the duplicate name/code |
| Abstract Data Type code maximum length | The code of the ADT is longer than the maximum allowed by the DBMS.
Manual correction: Reduce the length of the code Automatic correction: Reduces the code to a permissible length |
| Instantiable object type must have attributes and no abstract procedures | If an abstract data type of type Object (or SQLJ Object) is instantiable (Abstract option not checked), then it must have attributes and no abstract procedure.
Manual correction: Define at least one attribute in the ADT Attributes tab and clear the Abstract option in the procedures property sheet Automatic correction: None |
| Abstract object type must not have tables based on it | If an abstract data type of type Object (or SQLJ Object) is not instantiable (Abstract option checked), then it must not have tables based on it.
Manual correction: Set the Based on property to <None> in the tables property sheet Automatic correction: None |
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