[hibernate-dev] 6.0 - Type redesign

Steve Ebersole steve at hibernate.org
Fri Jun 24 19:24:22 EDT 2016

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
> _______________________________________________
>> hibernate-dev mailing list
>> hibernate-dev at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/hibernate-dev

More information about the hibernate-dev mailing list