[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2308) Adjusting the Outer Join Predicate using Criteria Query

[Scott Van Wart (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33597#action_33597 ] 

Scott Van Wart commented on HHH-2308:
-------------------------------------

Would anybody be interested in the following interface for arbitrary join clauses?

public interface Criteria {
  public Criteria createAlias(String associationPath, String alias, int joinType, Criterion extraJoinClauses)
    throws HibernateException;
}

This would work similarly to the "WITH" clause in HQL (e.g. "select c from Cat c join c.kittens k WITH k.eyeColor = :eyeColor").

I think I've hacked (though it's fairly straightforward) something together for 3.3.1 that works, so if there's enough interest I'll forward port it and submit a patch.

- Scott

> Adjusting the Outer Join Predicate using Criteria Query
> -------------------------------------------------------
>
>                 Key: HHH-2308
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2308
>             Project: Hibernate Core
>          Issue Type: New Feature
>          Components: query-criteria
>    Affects Versions: 3.2.1
>         Environment: Linux Using MS SQLServer
>            Reporter: Ben Grant
>         Attachments: hibernate-joinOn-sorted.ZIP, hibernate-joinOn.ZIP
>
>
> I have two tables 
> Table A 
> ||Col_1||Col_2|| 
> |London| UK | 
> |Liverpool| UK | 
> | New York | USA | 
> Table B 
> ||Col_1||Col_2|| Col_3|| 
> | UK | Europe | 0 
> | USA | Americas | 1 
> Using the Criteria class, Restriction Class and FetchMode, Hibernate manages to create a query that looks like this 
> select distinct top 2000 
> this_.Col_1 as y0_, TableB3_.Col2 as y1_ 
> from TableA this_ 
> left outer join TableB TableB3_ on this_.Col_2= TableB3_.Col_1 
> where TableB3_.Col_3=1 
> When really i need the query to be like this 
> select distinct top 2000 
> this_.Col_1 as y0_, TableB3_.Col2 as y1_ 
> from TableA this_ 
> left outer join TableB TableB3_ on this_.Col_2= TableB3_.Col_1 AND TableB3_.Col_3=1 
> currently their isn't any know way for hibernate to adjust or apply filters within the join clause.

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