[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3468) SQLFunction Criterion/Projection

[joel winteregg (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=31108#action_31108 ] 

joel winteregg commented on HHH-3468:
-------------------------------------

SqlFunctionProjection cannot be used into a Projections.groupProperty() because a property is needed ;-) If an alias is created using:
Projections.projectionList()
 .add(Projections.alias(new SqlFunctionProjection("date_trunc", "startDate", "hour"), "myalias"))

It is not possible to use it as follow: .add(Projections.groupProperty("myalias")) because groupProperty cannot find the created alias
 org.hibernate.QueryException: could not resolve property: myalias of: ...

Because groupProperty() method add the needed SQL statement into the SELECT statement and into the GROUP BY statement, no alias should be created. Maybe a new method like groupFunction() should be provided ?

For now, the following code works well, but it does not use defined function from SQL dialect:
.add(Projections.sqlGroupProjection("date_trunc('hour', startDate) as x", "x", new String[] { "x" }, new Type[] { Hibernate.STRING })) 

> SQLFunction Criterion/Projection
> --------------------------------
>
>                 Key: HHH-3468
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3468
>             Project: Hibernate3
>          Issue Type: New Feature
>          Components: query-criteria
>            Reporter: Steve Ebersole
>            Assignee: Steve Ebersole
>             Fix For: 3.2.x, 3.3.x, 3.4
>
>         Attachments: SqlFunctionProjection.java
>
>
> write Projection and Criterion impl to utilize SQLFunctions registered with the Dialect.

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