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From "Michael Watzek (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JDO-167) Inheritance mapping 2 needs to be changed to support polymorphic relationships to Employees
Date Thu, 08 Dec 2005 10:55:09 GMT
     [ http://issues.apache.org/jira/browse/JDO-167?page=all ]

Michael Watzek updated JDO-167:
-------------------------------

    Attachment: JDO-167.patch2

The second patch implements the comments above.


> Inheritance mapping 2 needs to be changed to support polymorphic relationships to Employees
> -------------------------------------------------------------------------------------------
>
>          Key: JDO-167
>          URL: http://issues.apache.org/jira/browse/JDO-167
>      Project: JDO
>         Type: Bug
>   Components: tck20
>     Reporter: Michael Watzek
>     Assignee: Michael Watzek
>  Attachments: JDO-167.patch, JDO-167.patch2
>
> Inheritance mapping 2 is incomplete wrt Employee relationships. Due to this lack, implementations
cannot figure out the right runtime type at navigation time, e.g. navigating from Project
to Employee. 
> In t-conference, Sep 30, Craig proposed to drop the identity propties from PK columns
of tables persons, fulltimeemployees, parttimeemployees. Instead, we introduce implementation-defined
sequences to generate unique key values for all instances of the Person class hierarchy. Having
unique PK values for each row in the hierarchy, implementations are able to find out the right
runtime type when navigating Employee relationships.
> We need to adapt the schema and the ORM metadata in order to reflect these changes.

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