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| Re: [Teneo] Inheritence mapping annotation on Ecore [message #1279097 is a reply to message #1278800] |
Fri, 28 March 2014 08:23  |
 Martin Taal
Messages: 5468
Registered: July 2009 |
Senior Member |
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Hi Roza,
Did you look at this page:
https://wiki.eclipse.org/Teneo/Hibernate/ModelRelational/Inheritance_Mapping
I personally like @MappedSuperclass a lot, see the JPA spec for its usage. So define a rootclass/type with common
attributes, annotate it with @Mappedsuperclass, then its subclasses will be in their own tables sharing the same attributes.
This page talks about in general how to work with annotations in teneo:
https://wiki.eclipse.org/Teneo/Hibernate/ModelRelational/Annotations_Format
In the eclipse emf editor you can right click on a model element (eclass/ereference/edatatype/eattribute) and then add
an eannotation, the source and details settings are described in the page above.
For ignoring references you can set the @Transient annotation in the EClass (that eclass and all ereferences to it will
be ignored).
You can also denote individual ereferences/efeatures to be ignored, set the @Transient annotation on the efeature
directly then.
gr. Martin
On 03/27/2014 10:45 PM, Roza Ghamari wrote:
> Hi all,
>
> I am a newbie to Teneo hibernate world and I am trying to use these technologies on my EMF model. I used ecore for
> editing my models. My class structure is designed based on our application needs and it is not that straightforward to
> map this structure to OR.
>
> Unfortunately, I couldn't find much documentation to help me with JPA annotations on Ecore for someone with no clue like
> me. I downloaded the example ecores but none of them have inheritance annotation. I really appreciate if you can help me
> with these or if you can redirect me to a better (simpler) documentation.
>
> My class model is:
>
> BaseClass
>
> ClassA extends BaseClass ClassB extends BaseClass
> ClassC Extends BaseClass
>
> ClassSubC1 extends ClassC
> ClassSubC2 extends ClassC
> ...
>
> My first problem is to be bale to do a "TABLE_PER_CLASS" mapping for ClassA, CLassB and ClassC and for ClassC
> subclasses, I just want to keep the superclass (i.e. ClassC) data in the DB. How can I annotate my ecore model for this?
>
> The other issue that I have, is that my ClassC has a reference to a Base2Class in another package. I want hibernate and
> teneo to ignore this reference when they are stored in the DB, and I don't want to make any tables for the classes in
> the referenced epackage. I have some other attributes as well that I'd like to be gnored by hibernate. Is there any
> annotations to do that?
>
> Thanks very much for your help in advance.
--
With Regards, Martin Taal
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