[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3646) implement Criteria API querying of collection-of-component

[Jean-Noel Rivasseau (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=39076#action_39076 ] 

Jean-Noel Rivasseau commented on HHH-3646:
------------------------------------------

This patch includes documentation and unit tests, solves one of the most voted for issues in Hibernate, but still has not been applied. Please, someone, shedule this bug for a fix version...

> implement Criteria API querying of collection-of-component
> ----------------------------------------------------------
>
>                 Key: HHH-3646
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3646
>             Project: Hibernate Core
>          Issue Type: Patch
>          Components: query-criteria
>    Affects Versions: 3.2.6
>         Environment: hibernate 3.2.6, tested on linux 64-bit openjdk 1.6 (jdk1.5 for compiling).  mapping created under annotations 3.3.1ga
>            Reporter: David Mansfield
>         Attachments: 0001-only-prepend-the-a-comma-when-we-definitely-have-a-s.patch, 0002-throw-a-better-exception-if-an-attempt-is-mado-to-pu.patch, 0003-implement-criteria-query-of-collection-of-component-.patch, 0004-implement-a-test-case-for-query-collection-of-value.patch, 0005-implement-a-test-case-for-query-collection-of-compon.patch, hib-core-query-collection-of-elements-3_2_6-ver2.patch, hib-core-query-collection-of-elements-3_2_6.patch, hib-core-query-collection-of-elements-3_3_1-ver5.patch, hib-core-query-collection-of-elements-3_3_1-ver6.patch
>
>   Original Estimate: 8h
>  Remaining Estimate: 8h
>
> the attached patch implements a first cut, extremely rough, yet working extension of the CriteriaQueryTranslator class to allow for querying of properties of components inside a collection, or querying properties of associated elements of components inside a collection.  eg for
> * code is lightly tested, this example is for illustrative purposes only
> * i use annotations, so my example is expressed in those terms, and i've only tested with mappings generated via annotations, however, the modifications only apply to the core.
> @Entity
> class Order {
>    @Id
>   String id;
>   @CollectionOfElements
>   Set<OrderLineItem> lineItems;
> }
> @Embeddable
> class OrderLineItem {
>   @ManyToOne
>   Product product;
>   Integer quantity;
> }
> @Entity
> class Product {
>   String name;
> }
> Then we can now do:
> Criteria c = session.createCriteria(Order.class)
>    .createCriteria("lineItems")
>    .add(Restrictions.gt("quantity", new Integer(1))
>    .list();
> or
> Criteria c = session.createCriteria(Order.class)
>    .createCriteria("lineItems")
>    .createCriteria("product")
>    .add(Restrictions.like("name", "cake%")
>    .list();

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