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Populating EMF Resource using default serialization and Non-containment from Database - Want to avoi [message #482263]

Tue, 25 August 2009 21:54

Richard Catlin

Messages: 50
Registered: July 2009

Member

I am populating an Ecore model using the default serialization from a
database.

Object A has a many-to-many relationship with Object B

I am using JPA to build a tree from the database, traverse it, and
persist to the Ecore default serialization.

The problem I am encountering is that several Object A may point to
Object B, so when I traverse the tree, I want to check the Resource to
see if Object B has already been added.

What the best way to do this? Is there an Option to prevent duplicates
or do I have to query the resource first to see if Object B already exists?

Regards,
Richard Catlin

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Re: Populating EMF Resource using default serialization and Non-containment from Database - Want to [message #482769 is a reply to message #482263]

Thu, 27 August 2009 20:36

Mario Winterer

Messages: 136
Registered: July 2009

Senior Member

Hi Richard!

Why not use an IdentityHashMap to remember already loaded objects?
By the way: Do you know "´Teneo"
(http://www.eclipse.org/modeling/emft/?project=teneo)?
It uses Hibernate to persist EMF objects into relational databases.

Mario

"Richard Catlin" <richard.m.catlin@gmail.com> schrieb im Newsbeitrag
news:h71mhq$n3b$1@build.eclipse.org...
>I am populating an Ecore model using the default serialization from a
>database.
>
> Object A has a many-to-many relationship with Object B
>
> I am using JPA to build a tree from the database, traverse it, and persist
> to the Ecore default serialization.
>
> The problem I am encountering is that several Object A may point to Object
> B, so when I traverse the tree, I want to check the Resource to see if
> Object B has already been added.
>
> What the best way to do this? Is there an Option to prevent duplicates or
> do I have to query the resource first to see if Object B already exists?
>
> Regards,
> Richard Catlin

Report message to a moderator

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