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Re: [eclipselink-users] OUTER JOIN to Secondary Table
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Normally if an outerjoin is desired, you should instead use a OneToOne
relationship instead of a multiple table mapping. The issue is just not in
reading the class, but updating or inserting a row that may not be there is
problematic.
If you must use a multiple table mapping, then you can use a
DescriptorCustomizer to set the multipleTableJoinExpression for your
descriptor to one using equalOuterJoin.
Another solution would be to define a view that does the other join and map
to it.
See also,
http://en.wikibooks.org/wiki/Java_Persistence/Tables#Multiple_table_outer_joins
ashakirin wrote:
>
> Is it any way in EclipseLink to make OUTER JOIN to Secondary Table?
>
> Use case: There is a main employee table that may or may not have some
> extra data populated in a related secondary table. If there is data in the
> secondary table (@SecondaryTable), then I would like my Employee entity to
> have those fields filled in. If there isn't data for a given employee in
> the secondary table, then I would like my Employee entity to have nulls in
> those fields. Right now, if there's no row in the secondary table for a
> given employee, I get nothing.
>
> Unfortunately I cannot find acceptable solution in Internet.
> Is INNER JOIN for Secondary Table fixed by design?
>
> Regards,
> Andrei.
>
-----
http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland
http://www.eclipse.org/eclipselink/
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TopLink
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http://www.nabble.com/EclipseLink-f26430.html EclipseLink
Book: http://en.wikibooks.org/wiki/Java_Persistence Java Persistence
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