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Posted to jdo-dev@db.apache.org by "Craig Russell (JIRA)" <ji...@apache.org> on 2008/09/26 18:21:44 UTC
[jira] Resolved: (JDO-463) Clarify the behavior of an ordering
column mapped to a user-visible field in the target class
[ https://issues.apache.org/jira/browse/JDO-463?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Craig Russell resolved JDO-463.
-------------------------------
Resolution: Fixed
The specification dated 12-Sep-2008 contains the update.
> Clarify the behavior of an ordering column mapped to a user-visible field in the target class
> ---------------------------------------------------------------------------------------------
>
> Key: JDO-463
> URL: https://issues.apache.org/jira/browse/JDO-463
> Project: JDO
> Issue Type: Improvement
> Components: specification
> Affects Versions: JDO 2 maintenance release 1
> Reporter: Craig Russell
> Assignee: Craig Russell
> Fix For: JDO 2 maintenance release 2
>
>
> Section 18.15.8 says
> <spec>
> If the array or list field is mapped using the mapped-by attribute in the
> field metadata, then the ordering can be mapped to a field in the same class.
> In this case, use the mapped-by attribute in the order metadata to name the
> field containing the ordering data.
> </spec>
> This doesn't say whether the List is operated as an "indexed List" (where the
> JDO implementation will insert element index positions into the column
> defined by the mapped-by field in the element table - and that this mapped-by
> field should hence be integer based so it can store these indices), or
> whether it will be an "ordered List" (like JPA, where the elements in the
> List are retrieved using the ordering defined by the mapped-by column) and
> the values defined by the element objects in that field will govern the
> position in the list on retrieval.
> Andy's (JPOX) interpretation has always been the first one, since if the user has taken
> the time to insert elements into their List in an order then when they
> retrieve the List they should be in the same order.
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