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From "Craig Russell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JDO-215) Remove <order> from mapping for HashSetCollections and SetCollections.
Date Thu, 24 Nov 2005 00:30:57 GMT
    [ http://issues.apache.org/jira/browse/JDO-215?page=comments#action_12358440 ] 

Craig Russell commented on JDO-215:
-----------------------------------

As discussed on the JDO expert group, the primary-key annotation is only needed for cases
where there is an embedded Map key or Set element that doesn't have a unique key field already
known. That is, for embedded SimpleClass with datastore identity used as Map keys or Set elements.
The other cases have a known unique field that can be used to make the rows unique. For embedded
SimpleClass with appication identity, it's the id field. For non-embedded SimpleClass, it's
the foreign key reference. 


> Remove <order> from mapping for HashSetCollections and SetCollections.
> ----------------------------------------------------------------------
>
>          Key: JDO-215
>          URL: http://issues.apache.org/jira/browse/JDO-215
>      Project: JDO
>         Type: Bug
>   Components: tck20
>     Reporter: Craig Russell
>     Assignee: Michelle Caisse
>  Attachments: JDO-215.patch
>
> The mapping for HashSetCollections and SetCollections incorrectly have <order>
columns. 
> There should not be an ordering specified for the join table since duplicates are not
allowed. The mapping for application identity should not need a primary key, since the JDO
implementation should be able to figure out that the primary key is part of the Map.key, but
the datastore identity mapping does need a primary key (and again, I'd use the id field of
SimpleClass as the join table key column.

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