
Chapter 6 Generating a Conceptual Data Model from an
Update existing | You must indicate the following parameters when you update an existing |
Conceptual Data | CDM: |
Model |
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Parameter
Description
Select Model
Target Conceptual Data Model. This is the existing CDM that the newly generated CDM (source model) is merged with to create an updated CDM
Preserve Modifications
When selected, allows a comparison and merge of the newly generated CDM (default CDM) with the existing CDM
Clearing the Preserve Modifications checkbox
When Preserve modifications is not selected, PowerDesigner automatically replaces the selected target model (existing CDM) with the newly generated CDM. If you want to choose which objects to add or delete from the target model, you must select Preserve Modifications to compare and merge the two CDM.
CDM generation options
You can set the following general generation options:
Option
Check model
Save generation dependencies
Model Notation
Description
Checks the model before generating the CDM, and stops generation if an error is found
When selected, PowerDesigner keeps track of the identity of each generated object. This is useful when merging two CDM which have been generated from the same OOM. Objects can be compared and recognized as the same object, even if the object has been modified in the target CDM
Indicates the modeling methodology used in the generated CDM. You can choose Entity/Relationship, Merise, or Mixed. If you select Mixed, the two methodologies are available in the same model