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From "Andy Jefferson (JIRA)" <j...@apache.org>
Subject [jira] Created: (JDO-660) Ability to specify positioning of field 'column(s)' in datastore "table"
Date Thu, 10 Jun 2010 06:36:13 GMT
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

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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