More DDL generation woes
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More DDL generation woes
by ljnelson
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I am working with a 30 (!) year old database and attempting to put a JPA mapping on top of it. I'm making use of the DDL generation facility in EclipseLink (and the columnDefinition fragment defined by JPA) to see if I can get EclipseLink to come at least close to generating the original schema. I'm almost there, but.... :-)
As you'll see from looking at bugzilla, there are some issues with DDL generation. The latest DDL issue I've come across is the behavior with @Embeddable classes. Hibernate and OpenJPA get this right, or at least don't surprise me. I have a @MappedSuperclass, called Address. It defines, among other things, line1 and line2 as columns. Fine. Then I have a PrimaryAddress subclass, notated as an @Embeddable. It inherits from Address, and adds one field: line3. (All of these fields, whether defined in the @MappedSuperclass Address or its @Embeddable subclass, have columnDefinition fragments on them akin to this: columnDefinition = "CHAR(25)".) Finally, I have a Party class that embeds a PrimaryAddress. I would expect at DDL creation time to see the Party entity's table contain the following fields: line1, line2, line3. Instead it only creates line3 as a column--it ignores the DDL instructions present in the @MappedSuperclass. Both Hibernate and OpenJPA create the table as I would expect. I know this is an unspecified swampland in the JPA specification, but is this a bug in EclipseLink? If so, I'll file (yet another) issue against the DDL machinery. If someone wants to point me to where all this happens in the code, I'm happy to try to submit a patch. Gulp! Thanks, Laird _______________________________________________ eclipselink-users mailing list eclipselink-users@... https://dev.eclipse.org/mailman/listinfo/eclipselink-users |
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Re: More DDL generation woes
by tware
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Hi Laird,
The use of a MappedSuperclass as a superclass of an Embeddable is functionality that is not defined in the JPA specification (and unfortunately, not functionality we have added to EclipseLink yet. It would be well worth entering an enhancement request for this. If you are interested in investigating adding this functionality, we could likely add some pointers to where this functionality occurs to your enhancement request. -Tom Laird Nelson wrote: > I am working with a 30 (!) year old database and attempting to put a JPA > mapping on top of it. I'm making use of the DDL generation facility in > EclipseLink (and the columnDefinition fragment defined by JPA) to see if > I can get EclipseLink to come at least close to generating the original > schema. I'm almost there, but.... :-) > > As you'll see from looking at bugzilla, there are some issues with DDL > generation. > > The latest DDL issue I've come across is the behavior with @Embeddable > classes. Hibernate and OpenJPA get this right, or at least don't > surprise me. > > I have a @MappedSuperclass, called Address. It defines, among other > things, line1 and line2 as columns. Fine. > > Then I have a PrimaryAddress subclass, notated as an @Embeddable. It > inherits from Address, and adds one field: line3. > > (All of these fields, whether defined in the @MappedSuperclass Address > or its @Embeddable subclass, have columnDefinition fragments on them > akin to this: columnDefinition = "CHAR(25)".) > > Finally, I have a Party class that embeds a PrimaryAddress. > > I would expect at DDL creation time to see the Party entity's table > contain the following fields: line1, line2, line3. Instead it only > creates line3 as a column--it ignores the DDL instructions present in > the @MappedSuperclass. Both Hibernate and OpenJPA create the table as I > would expect. > > I know this is an unspecified swampland in the JPA specification, but is > this a bug in EclipseLink? If so, I'll file (yet another) issue against > the DDL machinery. If someone wants to point me to where all this > happens in the code, I'm happy to try to submit a patch. Gulp! > > Thanks, > Laird > > > ------------------------------------------------------------------------ > > _______________________________________________ > eclipselink-users mailing list > eclipselink-users@... > https://dev.eclipse.org/mailman/listinfo/eclipselink-users eclipselink-users mailing list eclipselink-users@... https://dev.eclipse.org/mailman/listinfo/eclipselink-users |
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Re: More DDL generation woes
by ljnelson
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On Thu, Jul 9, 2009 at 9:24 AM, Tom Ware <tom.ware@...> wrote:
The use of a MappedSuperclass as a superclass of an Embeddable is functionality that is not defined in the JPA specification (and unfortunately, not functionality we have added to EclipseLink yet. It would be well worth entering an enhancement request for this. If you are interested in investigating adding this functionality, we could likely add some pointers to where this functionality occurs to your enhancement request. _______________________________________________ eclipselink-users mailing list eclipselink-users@... https://dev.eclipse.org/mailman/listinfo/eclipselink-users |
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Re: More DDL generation woes
by tware
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'updated the bug with some initial pointers.
Laird Nelson wrote: > On Thu, Jul 9, 2009 at 9:24 AM, Tom Ware <tom.ware@... > <mailto:tom.ware@...>> wrote: > > The use of a MappedSuperclass as a superclass of an Embeddable is > functionality that is not defined in the JPA specification (and > unfortunately, not functionality we have added to EclipseLink yet. > It would be well worth entering an enhancement request for this. > If you are interested in investigating adding this functionality, > we could likely add some pointers to where this functionality occurs > to your enhancement request. > > > Done: https://bugs.eclipse.org/bugs/show_bug.cgi?id=283028 > > Best, > Laird > > > ------------------------------------------------------------------------ > > _______________________________________________ > eclipselink-users mailing list > eclipselink-users@... > https://dev.eclipse.org/mailman/listinfo/eclipselink-users eclipselink-users mailing list eclipselink-users@... https://dev.eclipse.org/mailman/listinfo/eclipselink-users |
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