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 Post subject: JPA / PostgreSQL9Dialect: registerFunction
PostPosted: Wed Feb 01, 2017 2:36 pm 
Newbie

Joined: Sat Sep 18, 2010 3:16 am
Posts: 5
Hallo zusammen,
ist es möglich, eine Nicht-Standard-SQL-Funktion von Postgresql wie "split_part" so zu registrieren, dass sie wie bspw. sum() funktioniert?

Folgendes Beispiel mit sum() kann ich in meiner javax.persistence.NamedQuery verwenden:
Code:
select v.property_1, sum(v.property_2) FROM entityname v GROUP BY v.property_1

Leider funktioniert es mit der split_part() Funktion nicht:
Code:
select v.property_1, split_part(v.property_3) FROM entityname v GROUP BY v.property_1

Folgende Exceptions werden geworfen:
- antlr.NoViableAltException: unexpected token: v
bzw.
- org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: v

Registriert habe ich die "split_part" wie folgt:
Code:
public class MyPostgreSQL9Dialect extends PostgreSQL9Dialect {    
   public MyPostgreSQL9Dialect () {
      super();
      registerFunction("split_part", new StandardSQLFunction("split_part", StandardBasicTypes.STRING));
   }
}

Zum besseren Verständnis habe ich die split_part - Funktion vereinfacht dargestellt.

Vielen Dank und Grüße
Jan


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 Post subject: Re: JPA / PostgreSQL9Dialect: registerFunction
PostPosted: Mon Feb 06, 2017 4:26 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1176
I don't think this thread is getting any attention. You should post to the English forum instead.

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If you liked my answer, you are going to love my High-Performance Java Persistence book and my blog as well.


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