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https://issues.apache.org/jira/browse/JDO-702?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Jefferson updated JDO-702:
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Attachment: JDO-702.patch
Patch that
* adds DiscriminatorMetadata to EmbeddedMetadata
* adds <discriminator> subelement to <embedded> in DTD/XSD
* adds Discriminator member to @Embedded.
> Support for specification of embedded inherited objects
> -------------------------------------------------------
>
> Key: JDO-702
> URL: https://issues.apache.org/jira/browse/JDO-702
> Project: JDO
> Issue Type: New Feature
> Components: api, specification, tck
> Reporter: Andy Jefferson
> Attachments: JDO-702.patch
>
>
> While JDO2+ allows specification of embedded objects stored with primary
> objects, it doesn't have any specific way of specifying the embedded object
> as being inherited and how you would persist it. In particular there is no
> way to define a discriminator (column) for the embedded object. If we have an
> example from the JDO spec, and if we have a subclass of Address as also
> persistable, then we need to specify the discriminator for "primaryAddress"
> field.
> <class name="Employee" table="EMP">
> ...
> <!-- field type is Address -->
> <field name="primaryAddress">
> <embedded null-indicator-column="PADDR_STREET">
> <discriminator column="PADDR_DISCRIM"/>
> <field name="street" column="PADDR_STREET"/>
> <field name="city" column="PADDR_CITY"/>
> <field name="state" column="PADDR_STATE"/>
> <field name="zip" column="PADDR_ZIPCODE"/>
> </embedded>
> </field>
> </class>
> So the XSD/DTD need updates to allow <discriminator> under <embedded>, the
> JDO Metadata API needs to allow this also, and the @Embedded annotation needs
> a "discriminator" attribute adding.
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