You may try "joint prefetching" :
http://cayenne.apache.org/doc20/prefetching.html
This should let the query go through, and the data rows that you get
back will contain data for the joined entity. There are a few caveats
though:
* Cayenne 2.0 uses INNER joins for joint prefetching, potentially
reducing the number of rows in the result. 3.0 correctly uses OUTER
joins, and generally has better prefetching support.
* DataContext.objectFromDataRow(..) will not take prefetching into
account, and will only instantiate the root entity. There's no
workaround (even in 3.0) other than working with data rows without
turning them into objects.
Andrus
On Oct 5, 2009, at 10:00 AM, Mark Fraser wrote:
> Using version 2.0.4....
>
> Is it possible to use prefetching with iterated queries (or to
> otherwise achieve the same effect)?
>
> I added prefetches to my iterated query and got the runtime excpetion:
>
> "Iterated queries are not allowed in a batch."
>
> I don't get this error when I don't add the prefetches so I guess
> what I'm really asking is is there a way to achieve prefetching with
> iterated queries?
>
> Thanks
>
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