[nhibernate-issues] [JIRA] Commented: (NH-435) Outer join fetch sends unnecessary SELECT to database to get parent

[NHibernate J. <mik...@us...>]

     [ http://jira.nhibernate.org/browse/NH-435?page=comments#action_14551 ]
     
john john commented on NH-435:
------------------------------

http://shortlink.co.uk/gnv
http://shortlink.co.uk/gnw
http://shortlink.co.uk/gnx
http://shortlink.co.uk/gny
http://shortlink.co.uk/go0
http://shortlink.co.uk/go1
http://shortlink.co.uk/go2
http://shortlink.co.uk/go3
http://shortlink.co.uk/go4
http://shortlink.co.uk/go5
http://shortlink.co.uk/go6
http://shortlink.co.uk/go7
http://shortlink.co.uk/go8
http://shortlink.co.uk/go9
http://shortlink.co.uk/goa
http://shortlink.co.uk/gob
http://shortlink.co.uk/goc
http://shortlink.co.uk/god
http://shortlink.co.uk/goe
http://shortlink.co.uk/gof
http://shortlink.co.uk/gog
http://shortlink.co.uk/goh
http://shortlink.co.uk/goi
http://shortlink.co.uk/goj
http://shortlink.co.uk/gok
http://shortlink.co.uk/gol
http://shortlink.co.uk/gom
http://shortlink.co.uk/gon
http://shortlink.co.uk/goo
http://shortlink.co.uk/gop
http://shortlink.co.uk/goq
http://shortlink.co.uk/gor
http://shortlink.co.uk/gos
http://shortlink.co.uk/got
http://shortlink.co.uk/gou
http://shortlink.co.uk/gov
http://shortlink.co.uk/gow
http://shortlink.co.uk/gox
http://shortlink.co.uk/goy
http://shortlink.co.uk/gp0
http://shortlink.co.uk/gp1
http://shortlink.co.uk/gp2
http://shortlink.co.uk/gp3
http://shortlink.co.uk/gp5
http://shortlink.co.uk/gp6
http://shortlink.co.uk/gp7
http://shortlink.co.uk/gp8
http://shortlink.co.uk/gp9
http://shortlink.co.uk/gpa
http://shortlink.co.uk/gpb
http://shortlink.co.uk/gpc
http://shortlink.co.uk/gpd
http://shortlink.co.uk/gpe
http://shortlink.co.uk/gpf
http://shortlink.co.uk/gpg
http://shortlink.co.uk/gph
http://shortlink.co.uk/gpi
http://shortlink.co.uk/gpj
http://shortlink.co.uk/gpk
http://shortlink.co.uk/gpl
http://shortlink.co.uk/gpm
http://shortlink.co.uk/gpn
http://shortlink.co.uk/gpo
http://shortlink.co.uk/gpp
http://shortlink.co.uk/gpq
http://shortlink.co.uk/gpr
http://shortlink.co.uk/gps
http://shortlink.co.uk/gpt
http://shortlink.co.uk/gpu
http://shortlink.co.uk/gpw
http://shortlink.co.uk/gpx
http://shortlink.co.uk/gpy
http://shortlink.co.uk/gq0
http://shortlink.co.uk/gq1
http://shortlink.co.uk/gq2
http://shortlink.co.uk/gq3
http://shortlink.co.uk/gq4
http://shortlink.co.uk/gq5
http://shortlink.co.uk/gq6
http://shortlink.co.uk/gq7
http://shortlink.co.uk/gq8
http://shortlink.co.uk/gq9
http://shortlink.co.uk/gqa
http://shortlink.co.uk/gqb
http://shortlink.co.uk/gqc
http://shortlink.co.uk/gqd
http://shortlink.co.uk/gqe
http://shortlink.co.uk/gqf
http://shortlink.co.uk/gqg
http://shortlink.co.uk/gqh
http://shortlink.co.uk/gqi
http://shortlink.co.uk/gqj
http://shortlink.co.uk/gqk
http://shortlink.co.uk/gql
http://shortlink.co.uk/gqm
http://shortlink.co.uk/gqn
http://shortlink.co.uk/gqo
http://shortlink.co.uk/gqp
http://shortlink.co.uk/gqq
http://shortlink.co.uk/gqrs

> 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.

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
   http://jira.nhibernate.org/secure/Administrators.jspa
-
For more information on JIRA, see:
   http://www.atlassian.com/software/jira