Meet in the Middle

If you have existing OOM and PDM, you can also define mapping between them manually. The O/R Mapping models in PowerDesigner are platform independent.

There is not any constraint on the way you map your persistent classes. However, there are some well-defined mapping strategies, which are supported by most of O/R Mapping technologies. You should follow these strategies in order to build correct O/R Mapping models. However, minor differences still reside between them which we will raise when necessary.

Note: when your O/R Mapping models are related with a specific technology, for example when you add an EJB 3.0 persistence extended model definition to your model, there will be some constraints and we provide model checks to help you check the syntax of the mappings you have defined.

• Defining Basic Mapping
  In order to define basic mapping, you have to define a data source for your OOM. Then you can define the mapping using the Mapping tab of the OOM object you want to map to a PDM object or using the Mapping Editor.
• Defining Association Mapping
  You can define association mapping in the Mapping tab of the association property sheet and select the Add Objects tool to add mapping sources.
• Defining Inheritance Mapping
  Inheritance can be mapped in different ways.

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Created October 7, 2009. Send feedback on this help topic to Sybase Technical Publications: pubs@sybase.com