[hibernate-dev] 6.0 - Type redesign

[Steve Ebersole]

Ok, I need to move forward on this and I have gotten enough affirmative
feedback to ahead.

On Fri, Jun 24, 2016 at 6:24 PM Steve Ebersole <steve at hibernate.org> wrote:

> This is all part of the to-be-decided read/write part of the new Type
> contract.  I propose, as discussed in the wiki, that we have Type return
> ValueExtractor and ValueBinder for read/write.  So assuming that is there...
>
> One possible answer to your story is that OGM as a SQM interpreter and
> Metamodel (persisters, etc) implementor would influence the Type and
> therefore the ValueExtractor and ValueBinder.  We'd just need to define the
> right generic API to allow that to happen without ORM, e.g., having to jump
> through a bunch of hoops to get to JDBC objects.
>
> On Fri, Jun 24, 2016 at 5:18 PM Gunnar Morling <gunnar at hibernate.org>
> wrote:
>
>> Steve,
>>
>> I still need to look at the wiki page and will give more detailed
>> feedback on some parts of it.
>>
>> One general thing coming to mind though is how support for OGM could be
>> improved. On first thought I'd say the "Java side" of Type might stay as
>> is, but the "SQL side" (or "datastore side") and read/write logic
>> interacting with result sets etc. would have to look differently in the
>> case of OGM.
>>
>> If this part of the story could be made pluggable somehow, than a custom
>> factory of sorts in OGM could plug in its dedicated implementation of the
>> "datastore side". Not sure how it'd look in practice, the implementations
>> would be rather different (we don't work with ResultSet at all in OGM), so
>> I suppose it might require casting to the expected subtype when working
>> with Type in ORM or OGM.
>>
>> Currently, we completely override the Type hierarchy from ORM with a
>> corresponding GridType hierarchy in OGM, but it might be possible to re-use
>> many more code by just customizing the "datastore side". Plus, it'd be a
>> tad more efficient for OGM, as we can skip the translation from Type to
>> GridType.
>>
>> I might provide some more details once having studied the current
>> proposal in more depth, just wanted to get out these thoughts to you.
>>
>> --Gunnar
>>
>>
>>
>>
>> 2016-06-22 18:54 GMT+02:00 Steve Ebersole <steve at hibernate.org>:
>>
>>> I started a wiki discussing the proposal for the type system redesign.
>>> Let's get discussions about it starter sooner rather than later.  Thanks!
>>>
>>> https://github.com/hibernate/hibernate-orm/wiki/6.0---Type-redesign
>>>
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>>
>>