[nhibernate-issues] [JIRA] Commented: (NH-738) HQL select new generics support

[NHibernate J. <nh...@gm...>]

    [ http://nhjira.koah.net/browse/NH-738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18215#action_18215 ] 

William Chang commented on NH-738:
----------------------------------

Please support generics in HQL (e.g. select new), because I use it for many form elements like dropdownlist. I find it cumbersome to create a class for pair values returned from HQL.

For example, using Castle ActiveRecord and Hibernate Query Language:
SimpleQuery<KeyValuePair<int, String>> q = new SimpleQuery<KeyValuePair<int, String>>(typeof(List), @"
            select new KeyValuePair<int, String>(o.listId, o.listName) from List o
");
return q.Execute();

Error Exception:
NHibernate.Hql.Ast.ANTLR.QuerySyntaxException: Exception of type 'Antlr.Runtime.MismatchedTokenException' was thrown. [
select new System.Collections.Generic.KeyValuePair<int, String>(o.listId, o.listName) from Vendorsoft.Data.Models.List o
]

> HQL select new generics support
> -------------------------------
>
>                 Key: NH-738
>                 URL: http://nhjira.koah.net/browse/NH-738
>             Project:  NHibernate
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.2.0.Beta1
>            Reporter: Mike Nichols
>            Priority: Major
>
> Given class Pair<int,string> that has a constructor Pair(int i, string s), HQL fails to parse out the generic parameter tokens when trying the following expression: 'select new Pair<int,string>(p.Id,p.Name) from Person p'
> The <import/> is used to pull in this custom Pair class.
> The default error " , expected in SELECT ..." appears, but this is misleading. 
> Actually, the tokens in the QueryTranslator class' ConcreteQueries() method aren't parsed correctly when generic "<>" symbols are present in the query. It reads the comma in the generic parameter list as a field separator and doesn't recognize the less-than/greater-than symbols. 
> Seems like this could be a powerful and (simple?) improvement ...

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