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Re: InstantDB: Problem with updates and foreign keys (Beta 2)


James

Fix for this will be in the next release. Hopefully coming in the next few
days.

Regards

Pete

--

Peter Hearty                         peter.hearty@lutris.com
Lutris Technologies (UK)        http://www.lutris.com
----- Original Message -----
From: "James Medlock" <jmedlock@tenornetworks.com>
To: <instantDB@enhydra.org>
Sent: Wednesday, September 20, 2000 5:23 PM
Subject: RE: InstantDB: Problem with updates and foreign keys (Beta 2)


> Is this something that can be fixed in the next beta as this problem makes
> FK's pretty much unusable?
>
> Thanks
> James
>
> -----Original Message-----
> From: owner-instantDB@enhydra.org [mailto:owner-instantDB@enhydra.org]On
> Behalf Of Peter Hearty
> Sent: Tuesday, September 19, 2000 1:49 PM
> To: instantDB@enhydra.org
> Subject: Re: InstantDB: Problem with updates and foreign keys (Beta 2)
>
>
> James
>
> Looks like a bug. InstantDB implements updates by doing a delete followed
by
> an insert. It's probably failing on the delete part because it hasn't
> checked that the subsequent insert has a valid value that will restore the
> referential integrity.
>
> Regards
>
> Pete
>
> --
>
> Peter Hearty                         peter.hearty@lutris.com
> Lutris Technologies (UK)        http://www.lutris.com
> ----- Original Message -----
> From: "James Medlock" <jmedlock@tenornetworks.com>
> To: <instantdb@enhydra.org>
> Sent: Tuesday, September 19, 2000 6:15 PM
> Subject: InstantDB: Problem with updates and foreign keys (Beta 2)
>
>
> > When I try and do an update of a row in a table for which there is a
> foreign
> > key reference, I get an exception stating that "Cannot delete value,
XXX.
> In
> > use by column A.B".
> >
> > Am I doing something wrong, or can Foreign Keys not be used in tables
that
> > are being updated?
> >
> > Thanks
> > James
> >
> > --
> >
> > Example:
> >
> > ; First load the JDBC driver and open a database.
> > d org.enhydra.instantdb.jdbc.idbDriver;
> > o jdbc:idb=blah.prp;
> >
> > ; Record all results
> > e SET EXPORT "export0.txt" FIXEDLENGTH COLNAMEHEADER ROWNUMBERS
CONTROLCOL
> > SUMMARYHEADER;
> >
> > e create table BAR (
> >   ID int,
> >   NAME CHAR(32)
> > );
> >
> > e create table FOO (
> >   ID int foreign key references BAR(ID) on delete cascade,
> >   NAME char(32)
> > );
> >
> > e insert into BAR(ID, NAME) values(101, "fred");
> > e insert into BAR(ID, NAME) values(102, "joe");
> >
> > e insert into FOO(ID, NAME) values(101, "fred2");
> > e insert into FOO(ID, NAME) values(102, "joe2");
> >
> > ; This fails with "Cannot delete..." exception
> > e update BAR set NAME="newfred" where ID=101;
> >
> > ; The End
> > c close;
> >
>
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> >
>
> --------------------------------------------------------------------------
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>
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