[hibernate-dev] 6.0 - ResultTransformer

[Vlad Mihalcea]

Hi,

We definitely need to address the ResultTranformer.
Only the former method is what we should be exposing, the latter being used
only in one particular use case, so that should be addressed by a different
contract.

This way we could provide a ResultTransformer using a lambda, which is not
possible today.

Vlad

On Mon, Sep 12, 2016 at 5:49 AM, Steve Ebersole <steve at hibernate.org> wrote:

> Another legacy concept I'd like to revisit as we move to 6.0 is the
> Hibernate ResultTransformer.  I'd argue that ResultTransformer is no longer
> needed, especially in it's current form.
>
> Specifically, ResultTransformer defines 2 distinct ways to transform the
> results of a query:
>
>    1. `#transformTuple` - this method operates on each "row" of the result,
>    allowing the user to transform the Object[] into some other structure.
>    This is specifically the one I see no value in moving forward.  Between
>    dynamic-instantiation, Tuple-handling, etc I think users have the needed
>    capabilities to transform the query result tuples.
>    2. `#transformList` - this one operates on the query result as a whole
>    (unless scroll/iterate are used).  This method at least adds something
> that
>    cannot be done in another way.   But I'd still personally question its
>    overall usefulness.
>
> Does anyone have an argument for continuing to support either of these?
> Personally, I propose just dropping the ResultTransformer support
> altogether.
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