Thread: [nhibernate-issues] [JIRA] Commented: (NH-435) Outer join fetch sends unnecessary SELECT to databas

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     [ http://jira.nhibernate.org/browse/NH-435?page=comments#action_14551 ]
     
john john commented on NH-435:
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> Outer join fetch sends unnecessary  SELECT  to database to get parent
> ---------------------------------------------------------------------
>
>          Key: NH-435
>          URL: http://jira.nhibernate.org/browse/NH-435
>      Project: NHibernate
>         Type: Improvement
>   Components: Core
>     Versions: 1.0
>     Reporter: Xianfeng Lu
>  Attachments: nh-435.rar
>
> In a bi-directional parent-children relationship, if I call session.Find() to outer join fetch like this
> 	IList lst = session.Find("from Parent p left outer join fetch p.Children");
> I saw a SELECT...FROM Parent LEFT OUTER JOIN Children to fetch both parent object and child objects, but after it there is a SELECT...FROM Parent WHERE... to get children's parent from database. The second SQL is really not necessary since the parent has been in memory after the 1st SQL.
> I don't know if the 2nd level cache can avoid the 2nd SELECT hitting database any way.

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