Chapter 9 Generating Other Models from a PDM

Migrating models from version 6

When migrating a version 6 CDM and its corresponding generated PDM to current version, PowerDesigner automatically preserves the generation link between the CDM and the PDM during the import process. So that if you have modified the migrated CDM and PDM and want to regenerate the PDM from the CDM in current version, with the Preserve Modifications option selected, the modifications you made in the PDM are preserved.

Migration procedure

The synchronization of your models through migration is guaranteed as you import the version 6 CDM and its corresponding version 6 PDM at once.

The migration process begins with the import of the Conceptual Model then the import of the corresponding Physical Models.

There can be several generated PDMs for a given CDM. Note that if you fail to select one of the corresponding PDMs to import and wish later to import it in PowerDesigner current version, you must import again the version 6 CDM and select again its corresponding version 6 PDMs that you want to import. This operation is mandatory, otherwise the CDM and the previously imported PDMs are no longer synchronized.

When migrating a version 6 PDM, you can open:

• Archived models (*.apm): you avoid losing constraint names because archived models store all constraint names without making a difference between user defined and calculated constraints. Importing an archived model allows you to recover all the constraint names of your version 6 PDM, which is recommended
• Standard models (*.pdm): you may lose constraint names because standard PDM do not store calculated constraint names

To migrate version 6 models to current version and keep them synchronized:

1. Select File→Import→V6 Synchronized Models.
   
   The Import V6 Synchronized Models dialog box appears.
2. Click the Add CDM File tool in the Conceptual Data Model to import groupbox to select the CDM to import.
3. Click the Add PDM Files tool in the Physical Data Models to import groupbox to select the PDMs to import.
   
4. Click OK.
   
   The name of the CDM first appears in the Browser followed by the names of the PDMs you selected for import. The CDM diagram also appears in the diagram window.
5. Save the CDM in current version.
6. Save the PDMs in current version.
7. Save the workspace displaying the linked CDM and PDMs under a meaningful workspace name.

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