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robnik
 Post subject: Does Hibernate support custom class per row?
PostPosted: Fri Jun 02, 2017 2:41 pm 
Newbie

Joined: Fri May 05, 2017 12:09 pm
Posts: 7
Hi,

Is there a way to override which class Hibernate uses for each row of a table? So a select could return a list of objects of different types. For example, if I have a table like:

Code:
create table things (
   id integer,
   name text,
   java_class text
)


There is a Java class `Thing` (which has properties for `id` and `name`), and the `java_class` column can name a subclass of `Thing`.

Rob
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vlad
 Post subject: Re: Custom class per row?
PostPosted: Fri Jun 02, 2017 2:47 pm 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
Sure, it does support such a feature.

Just use SINGLE_TABLE inheritance as explained in this article. The java_class column is the discriminator type which you can customize using the @DiscriminatorColumn.
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robnik
 Post subject: Re: Custom class per row?
PostPosted: Fri Jun 02, 2017 3:05 pm 
Newbie

Joined: Fri May 05, 2017 12:09 pm
Posts: 7
vlad wrote:

Just use SINGLE_TABLE inheritance as explained in this article. The java_class column is the discriminator type which you can customize using the @DiscriminatorColumn.


I don't see any mention of inheritance or discriminators in that article. Is that the right link?

Rob
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vlad
 Post subject: Re: Does Hibernate support custom class per row?
PostPosted: Fri Jun 02, 2017 3:33 pm 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
By default, the discriminator column is called DTYPE. If you provide a @DiscriminatorColumn annotation, you can override the column name. The JavaDoc is very straightforward about it.

For more details, subscribe to my blog newsletter and I'll write about this topic in the following two weeks.
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