I know you can use derived attributes in Raw Row fetches (I do this
all the time). I don't see why they wouldn't work in regular fetches
too.
The exception explains why you can't do that. It's one thing to
included derived columns in the results of a query, and quite another
to make a derived column part of your qualifier. The derived column
is defined in the model, but how would EOF generate a WHERE clause
using a derived attribute, since there's no column in the database to
access?
On Apr 16, 2007, at 2:08 PM, John Huss wrote:
I know you can use derived attributes in Raw Row fetches (I do this
all the time). I don't see why they wouldn't work in regular fetches
too.
John
On 4/16/07, Ken Anderson <[EMAIL PROTECTED]> wrote:
No. Fetch specs work directly against the database, so if the column
doesn't exist (as with derived attributes), it can't work. You would
have to do a fetch on a superset, then use an in-memory qualifier to
include your derived attribute.
Ken
On Apr 16, 2007, at 10:45 AM, Catarina Vieira Simoes wrote:
> Hi!
>
> Is it possible to do a FetchSpecification over derived attributes?
> I tried and I got the error:
>
> java.lang.IllegalStateException: sqlStringForAttribute: attempt to
> generate SQL for attribute 'attributeName' on entity 'EntityName'
> with undefined column name. You must define a column name for this
> attribute before attempting a database operation.
>
> Since the derived attribute doesn't have a real column it should
> work, no? :)
> Thank you in advance.
> Sincerely,
>
> Catarina
>
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