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https://issues.apache.org/jira/browse/JDO-403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12507559
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Andy Jefferson commented on JDO-403:
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Why @JoinTable, @SecondaryTable, @Table ?
@Table is the equivalent of <class table="...">
@JoinTable is the equivalent of <field table="..."> when the field is a
container field
@SecondaryTable is the equivalent of <field table="..."> when the field is not
a container field
They also map directly across to the same annotations in JPA.
They are not part of @PersistenceCapabale, @Field since they are ORM and there
was a time when some other vendor requested that ORM annotations be kept
separate from non-ORM.
@JoinTable, @SecondaryTable have schema/catalog whereas there is no such
concept in the XML since it is desirable to be able to specify the
catalog/schema that ANY table is in, whether it is primary or secondary or join.
Why not just have @Table at class and field level ? because it is clearer to
have the annotations named specific after what they are representing.
We cant have an @Table element in @Join since then users would HAVE TO specify
it (back to limitations of default values in annotations).
Hope thats clearer :-)
> JDO2 Annotations
> ----------------
>
> Key: JDO-403
> URL: https://issues.apache.org/jira/browse/JDO-403
> Project: JDO
> Issue Type: New Feature
> Components: api2
> Affects Versions: JDO 2 final
> Reporter: Andy Jefferson
> Assignee: Michelle Caisse
> Fix For: JDO 2 maintenance release 1
>
> Attachments: embedded.patch, jdo_2_1_annotations.jar
>
>
> It would be desirable for JDO2 to have its own set of annotations. We have
> developed a set within JPOX that would likely serve as a starting point for
> such a set. In my opinion they should be
> 1. Split into javax.jdo.annotations.jdo and javax.jdo.annotations.orm
> 2. Move ORM attributes from some of the JDO annotations and have a ORM
> annotation.
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