Chapter 7 Generating JDO Persistent Objects

Defining Standard JDO Persistence Descriptors

To customize the generated JDO persistence descriptor and O/R mapping extensions, PowerDesigner uses extended attributes for classes, attributes and associations.

The standard JDO 1.0 persistence descriptor does not support O/R mapping. To define O/R mapping, you must use a JDO product that provides an O/R mapping extension.

To generate a standard JDO persistence descriptor without any extension:

1. Select Language→Generate Java Code.
2. Click on the Options tab.
3. Set the "JDO provider" option to <Standard>
4. Click Apply to save this option.
5. Click Cancel to close the window.

By default, PowerDesigner generates a single metadata.jdo file.

To generate a separate .jdo file for each package that contains persistent objects:

1. Select Language→Generate Java Code.
2. Click on the Options tab.
3. Set the "Use a single JDO persistence descriptor for all packages" option to false.
4. Click Apply to save this option.
5. Click Cancel to close the window.

If you want to generate a JDO persistence descriptor for a specific JDO product, you still need to configure standard JDO extended attributes.

If a class has primary key attributes, PowerDesigner will generate an inner class to implement the primary key class.

If you use inheritances, only the parent class can have primary key attributes.

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