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From "Patrick Linskey" <plins...@gmail.com>
Subject Re: Problem with @ManyToOne and @JoinTable
Date Mon, 05 Nov 2007 17:44:24 GMT
> I'm a newbie, so I don't quite grok the question.  Show itself
> doesn't have any references to InputFile.

Aha! IIRC, @ManyToOne is only meaningful when used as the back side of
a @OneToMany.

What happens if you just use a @OneToOne instead of the @ManyToOne?

-Patrick

On Nov 5, 2007 9:16 AM, Geir Magnusson Jr. <geir@pobox.com> wrote:
>
> On Nov 5, 2007, at 11:48 AM, Patrick Linskey wrote:
>
> > Hi,
> >
> > What does the other side of the relation look like?
>
> I'm a newbie, so I don't quite grok the question.  Show itself
> doesn't have any references to InputFile.
>
> > Also, what does
> > the Show class look like?
>
> in what way?  Show is a subclass in a JOINED inheritance strategy, if
> that makes any difference.
>
> geir
>
>
>
> >
> > -Patrick
> >
> > On Nov 5, 2007 8:08 AM, Geir Magnusson Jr. <geir@pobox.com> wrote:
> >> I'm a newbie, so forgive me if I'm not asking the question the right
> >> way.
> >>
> >> I have a join table in my DB :
> >>
> >> +-------------+------------------+------+-----+---------+-------+
> >> | Field       | Type             | Null | Key | Default | Extra |
> >> +-------------+------------------+------+-----+---------+-------+
> >> | showId      | int(11) unsigned | NO   | PRI |         |       |
> >> | inputFileId | int(11) unsigned | NO   | PRI |         |       |
> >> +-------------+------------------+------+-----+---------+-------+
> >>
> >> where showId and inputFileID are PKs in the show table and inputfile
> >> table.
> >>
> >> In my code for the InputFile class :
> >>
> >>      @ManyToOne
> >>      @JoinTable(name="Show2InputFile",
> >>              joinColumns = @JoinColumn(name="inputFileId"),
> >>              inverseJoinColumns = @JoinColumn(name="showId"))
> >>      public Show getShow() {
> >>          return show;
> >>      }
> >>
> >> When JPA is instrumenting my classes, it complains :
> >>
> >> Caused by: <openjpa-1.1.0-SNAPSHOT-r420667:588533 fatal user error>
> >> org.apache.openjpa.persistence.ArgumentException: You have supplied
> >> columns for "com.joost.model.logistics.InputFile.show<element:class
> >> java.lang.Object>", but this mapping cannot have columns in this
> >> context.
> >>
> >>
> >> I don't quite understand the error.  I use this same thing elsewhere
> >> (I think) w/o a problem.  Can someone give me a hint?
> >>
> >> geir
> >>
> >>
> >>
> >>
> >
> >
> >
> > --
> > Patrick Linskey
> > 202 669 5907
>
>



-- 
Patrick Linskey
202 669 5907

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