[hibernate-dev] Pull request for HHH-2394 (Support filter tag in subclass)

[Rob Worsnop]

Oh good. The way I am coding it, the flag will be ignored
if SqlFragmentAlias elements are present.

On Mon, Jun 25, 2012 at 3:40 PM, Steve Ebersole <steve at hibernate.org> wrote:

> And by the way, I think you are right in that if there are any explicit
> SqlFragmentAlias bits supplied, that we infer 'deduceAliasInjectionPoints'
> as being false.
>
>
> On 06/25/2012 08:29 AM, Rob Worsnop wrote:
>
>> Got it. Earlier you were looking for suggestions for a less verbose name
>> for this. How about "autoAliasInjection"?
>>
>> On Mon, Jun 25, 2012 at 8:20 AM, Steve Ebersole <steve at hibernate.org
>> <mailto:steve at hibernate.org>> wrote:
>>
>>    'deduceAliasInjectionPoints' is important when you don't have
>>    injections.  Otherwise Hibernate ends up scanning the condition
>>    fragment for no reason.
>>
>>
>>    On Fri 22 Jun 2012 11:09:31 AM CDT, Rob Worsnop wrote:
>>
>>        On Mon, Jun 4, 2012 at 12:14 PM, Steve Ebersole
>>        <steve at hibernate.org <mailto:steve at hibernate.org>> wrote:
>>
>>            1) I think adding support for {alias} is a more general
>>            issue.  Its
>>            applicable to many other pieces of mapping metadata
>>            (@Formula, etc).  More I
>>            was responding to David's comment there.  I totally think it
>>            makes sense to
>>            support this in all of those cases.  I guess the vote point
>>            there is whether
>>            we want to introduce that support piecemeal or develop it
>>            across the board.
>>              If we do do it piecemeal I think another piece of
>>            information we will need
>>            is a flag indicating whether to scan for alias injection
>>            points.  By
>>            "scanning" I mean the processing we do today where we
>>            tokenize the fragment
>>            string and then try to guess where an alias is needed.
>>            Let's call this
>>            flag 'deduceAliasInjectionPoints' for now.  I tend to favor
>>            meaningful
>>            attribute names so my suggested names tend to get a little
>>            long; I am open
>>            to suggestions for a more succinct name.  Anyway, I think it
>>            needs to be
>>            TRUE by default to maintain backwards compatible behavior.
>>              Here is an
>>            example:
>>
>>            @Filter(name="iqMin", table="ZOOLOGY_HUMAN",
>>            condition="{alias}.HUMAN_IQ >=
>>            :min", deduceAliasInjectionPoints=__**false)
>>
>>
>>            Here there is no need to deduce the points at which to
>>            inject an alias; we
>>            have done that for Hibernate in the supplied condition
>> fragment.
>>
>>            I think another discussion revolves around cases in which
>>            the fragment
>>            involves references to columns from multiple tables.  Mostly
>>            this is
>>            important for scenarios involving secondary tables and
>>            inheritance.  Do we
>>            want to provide support for that?  Using the classic
>>            org.hibernate.test.hql.Animal hierarchy from the testsuite,
>>            maybe something
>>            like:
>>
>>            @Filter(
>>               name="iqMin",
>>               condition="{a}.bodyWeight >= :minWeight and {m}.birthdate <
>>            :ageCutOffBirthDate",
>>               deduceAliasInjectionPoints=__**false,
>>
>>               aliases={
>>                   @SqlFragmentAlias( alias="a", entity=Animal.class ),
>>                   @SqlFragmentAlias( alias="m", entity=Mammal.class )
>>               }
>>            )
>>
>>
>>        How about just applying the secondary table usage to everything?
>>
>>        So, to rewrite your first example:
>>
>>        @Filter(name="iqMin", condition="{h}.HUMAN_IQ >=> :min",
>>             aliases={@SqlFragmentAlias( alias="h",
>>        table="ZOOLOGY_HUMAN" )})
>>
>>        Note that I didn't include "deduceAliasInjectionPoints". Wouldn't
>> we
>>        just infer that from the presence of the aliases element?
>>
>>
>>    --
>>    steve at hibernate.org <mailto:steve at hibernate.org>
>>    http://hibernate.org
>>
>>
>>
> --
> steve at hibernate.org
> http://hibernate.org
>
>
>