[hibernate-dev] 6.0 proposal - CollectionTuplizer

[Jordan Gigov]

Would this allow for queries of multiple keys, like this?

SELECT * FROM tbl WHERE (key1, key2) IN ( (val1k1,val1k2), (val2k1,val2k2)... )

I started working on trying to fit something like this in 5.2 and see
what problems I would encounter, but haven't had time to finish it.

On 16 June 2017 at 17:14, Steve Ebersole <steve at hibernate.org> wrote:
> No feedback, so I will work in this direction then...
>
> On Thu, May 18, 2017 at 10:23 AM Steve Ebersole <steve at hibernate.org> wrote:
>
>> As part of removing most Type sub-types we are left with the question of
>> how to handle the role served by CollectionType.  Andrea and I came up with
>> a proposal that not only serves that purpose but also allows a level of
>> customization we have so far not supported but which has been asked for a
>> few times (mostly as part of framework/language integration into Hibernate;
>> Ceylon, etc).
>>
>> Here is the proposal:
>>
>>    /**
>>     * Encapsulates collection type specific behavior/information
>>     * <p/>
>>     * NOTE : the name "tuplizer" was chosen as this really serves
>>     * same logical purpose as the entity and component tuplizers
>>     * do entities and components respectively.
>>     */
>>    interface CollectionTuplizer<C> {
>>       /**
>>        * Access to the type of the collection.  This
>>        * is expected to be an interface.  Used to create
>>        * a registry against which we can resolve the
>>        * reflected attribute type.  E.g. an attribute
>>        * defined as `List` would be resolved to the
>>        * CollectionTuplizer that deals with lists
>>        */
>>       Class<C> getCollectionJavaType();
>>
>>       /**
>>        * Create an empty instance of the collection wrapper
>>        */
>>       PersistentCollection<C> create(int anticipatedSize);
>>
>>       /**
>>        * Wrap an existing "raw" view of the collection
>>        */
>>       PersistentCollection<C> wrap(Object rawCollection);
>>
>>       /**
>>        * Creates the representation of this plural attribute
>>        * according to the runtime domain model view.
>>        */
>>       <O> PluralPersistentAttribute<O,C,?> generatePluralAttribute();
>>
>>       // anytihng else?  element comparator, etc?
>>    }
>>
>> Thoughts?  Suggestions?
>>
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