Ability to specify positioning of field 'column(s)' in datastore "table"
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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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