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Date: Sat, 25 Sep 2010 11:31:32 -0400 (EDT)
From: "Andy Jefferson (JIRA)" <jira@apache.org>
To: jdo-dev@db.apache.org
Subject: [jira] Updated: (JDO-660) Ability to specify positioning of field
 'column(s)' in datastore "table"
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     [ https://issues.apache.org/jira/browse/JDO-660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Jefferson updated JDO-660:
-------------------------------

    Attachment: JDO-660.patch

Please find attached a patch to add "position" attribute to @Column annotation, and to add "position" attribute to <column> XML element.

> Ability to specify positioning of field 'column(s)' in datastore "table"
> ------------------------------------------------------------------------
>
>                 Key: JDO-660
>                 URL: https://issues.apache.org/jira/browse/JDO-660
>             Project: JDO
>          Issue Type: New Feature
>          Components: api, specification, tck
>            Reporter: Andy Jefferson
>             Fix For: JDO 3 maintenance release 1
>
>         Attachments: JDO-660.patch
>
>
> With an RDBMS datastore, when generating the schema, it is desirable to be able to specify the positioning of the column(s) of a field in the generated table. 
> With spreadsheet documents, it is critical to be able to define which column number is used for a particular field.
> With other datastores it is also likely desirable.
> To achieve this I propose adding an attribute to the XML <column> called "position". Similarly for the @Column annotation.
> This can take integer values with 0-origin.
> Complications : 
> 1. how this is handled when we have inheritance. If a root class has subclass-table inheritance, then those fields are persisted into the tables of all subclasses, and we may want to override the positions for those individually - to that end the user can override the metadata of the superclass fields. 
> 2. anything else ?

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