[nhibernate-issues] [NHJIRA] Commented: (NH-2683) Add common dialect functions as extension methods for QueryOver

[Vahid N. (JIRA) <nh...@gm...>]

    [ http://216.121.112.228/browse/NH-2683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=21101#action_21101 ] 

Vahid Nasiri commented on NH-2683:
----------------------------------

Hi Richard,
Yes, this new syntax is much better, because in my not very recent sources of NH, I hadn't "Expression<Func<T>>" in RegisterCustomProjection. It was just "bool" not "T"! So I had to invent that fluent syntax to return just bool. I'll rewrite everything! 
Thanks for the comments.


> Add common dialect functions as extension methods for QueryOver
> ---------------------------------------------------------------
>
>                 Key: NH-2683
>                 URL: http://216.121.112.228/browse/NH-2683
>             Project:  NHibernate
>          Issue Type: Improvement
>          Components: QueryOver
>    Affects Versions: 3.2.0Alpha2
>            Reporter: Richard Brown
>            Assignee: Richard Brown
>            Priority: Minor
>         Attachments: QueryOverSqlFuncsExts.zip
>
>
> Some of the common functions (that are registered in most, if not all Dialects) can be used in ICriteria using SQL-projections.
> Extensions methods can be added for these to allow queries along the lines of:
> s.QueryOver<Person>()
>     .Where(p => p.BirthDate.Year() == 1970)
>     .List()
> ... which can be translated to:
>     .Where(Restrictions.Eq(Projections.SqlFunction("year", NHibernateUtil.DateTime, Projections.Property<Person>(p => p.BirthDate)), 1970))
> ... and in turn to:
>     datepart(year, this_.BirthDate) = @p0;

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