[nhibernate-issues] [JIRA] Updated: (NH-855) Port lazy="extra" from Hibernate 3

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

     [ http://jira.nhibernate.org/browse/NH-855?page=3Dall ]

Sergey Koshcheyev updated NH-855:
---------------------------------

    Fix Version: LATER
       Priority: Major  (was: Minor)
        Summary: Port lazy=3D"extra" from Hibernate 3  (was: Lazy collectio=
n retrieval should use proxies)
           type: New Feature  (was: Improvement)

> Port lazy=3D"extra" from Hibernate 3
> ----------------------------------
>
>          Key: NH-855
>          URL: http://jira.nhibernate.org/browse/NH-855
>      Project: NHibernate
>         Type: New Feature
>   Components: Core
>     Versions: 1.2.0.Beta2
>     Reporter: Andr=C3=A9s G. Aragoneses
>      Fix For: LATER
>  Attachments: NHibBugAboutDataRetrieval.zip
>
> When retrieving a lazy collection I've noted that there is much informati=
on retrieved from the DB that may not be needed. For example, if we only ne=
ed the Count property of the collection, NHibernate retrieves full objects =
instead of just proxies (object with only the ID property filled).
> I am attaching a testcase.
> Note the folling C# lines in the testcase:
> IList aParameters =3D oSession.CreateCriteria(typeof(Parameter)).List();
> if (aParameters.Count =3D=3D 0)
> {
>     return;
> }
> Parameter oParameter =3D aParameters[0] as Parameter;
> //the Group is a proxy object, so this instruction does not retrieve anyt=
hing from DB
> int iIdGroup =3D oParameter.Group.Id;
> //this instruction unproxies the object because it is filled with its pro=
perties
> string sName =3D oParameter.Group.Name;
> //why don't we retrieve here only proxies? because we only need to know h=
ow many rows, their ID's
> int iCount =3D oParameter.Group.Terminals.Count;
> //if in the last instruction NHibernate would have retrieved proxies inst=
ead of full objects
> //this instruction would generate a new query
> string sName2 =3D oParameter.Group.Terminals[0].Name;
> I know that maybe this is a too specific feature and perhaps, to be imple=
mented, it should be done so by adding a new configuration parameter, for e=
xample: RetrievalMode.Minimal.
> What do you think?
> P.S.: You may add the NHib libs to the Lib subdir of the ZIP file attache=
d, before building it.

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