db-jdo-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Andy Jefferson (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (JDO-702) Support for specification of embedded inherited objects
Date Mon, 16 Jan 2012 18:05:39 GMT

     [ https://issues.apache.org/jira/browse/JDO-702?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andy Jefferson updated JDO-702:
-------------------------------

    Attachment: JDO-702-test.patch

Patch includes new model with embedded inheritance and 4 tests; persistence of base embedded
type, persistence of subclass embedded type, query (cast, instanceof) of base embedded type,
query (cast, instanceof) of subclasses embedded type.
                
> 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-test.patch, 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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message