Chapter 7 Generating JDO Persistent Objects

Defining O/R Mapping

When you generate an OOM from a PDM or a PDM from an OOM, the default O/R mapping can be generated and saved in the OOM. You can also manually define complex O/R mapping.

The following diagram shows the Attributes Mapping page of class Customer. It was generated from a PDM.

For O/R mapping, PowerDesigner supports:

• Mapping of a class to one or several tables or views
• Mapping of an attribute to a column or an expression
• Select, insert, update and delete queries for a class
• Query for an operation
• Mapping of an association to a table or a reference
• Select, insert and delete queries for an association

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