Re: [eclipselink-users] Discriminator and Inheritance.strategy

["Guy Pelletier" <guy.pelletier@xxxxxxxxxx>]

A discriminator column is not needed for a TABLE_PER_CLASS strategy.

The discriminator column is used to determine which class of object that row 
represents.

Cheers,
Guy

----- Original Message ----- 
From: "Michael Simons" <michael.simons@xxxxxxxxxxx>
To: <eclipselink-users@xxxxxxxxxxx>
Sent: Friday, November 27, 2009 6:33 AM
Subject: [eclipselink-users] Discriminator and Inheritance.strategy


> Hello,
>
> I'm trying to port a client/server application first to JPA to enable the 
> 3-tier migration.
> At the moment I try to use EclipseLink as JPA implementation.
> The first exception I fall over said "Unknown column 't2.DTYPE' in 'field 
> list'"
>
> Seems like EclipseLink always needs a discriminator column even if the 
> inheritance strategy is
> JOIN or TABLE_PER_CLASS.
> Is this correct?
> And if so, what is it good/needed for?
>
> [EclipseLink 1.2.0, database=MySQL 5]
>
> Kind Regards,
> Michael
> _______________________________________________
> eclipselink-users mailing list
> eclipselink-users@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/eclipselink-users