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freetds - RE: [freetds] Odd statement execution problem

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  • From: "Lowden, James K" <LowdenJK AT bernstein.com>
  • To: 'FreeTDS Development Group' <freetds AT lists.ibiblio.org>
  • Subject: RE: [freetds] Odd statement execution problem
  • Date: Mon, 23 Jun 2003 15:20:30 -0400

> From: Will Saxon [mailto:WillS AT housing.ufl.edu]
> Sent: June 23, 2003 12:54 PM
>
> I have a perl script that is using DBD::Sybase 1.00 and DBI
> 1.47. I am using FreeTDS 0.61 on a FreeBSD 4.8-STABLE machine
> with Perl 5.8.0. All of the above are compiled from ports.
>
> This script has one section where the code is similar to this:
>
> unless ($hash{"key"}) {
> my $sql = "select value from table where field1 =
> '$variable' order by field2 desc";
> @array = $dbh->selectrow_array($sql);
> $hash{"key"} = $array[0];
>
> Occasionally, select statements are failing with an error like this:
>
> Can't call method "selectrow_array" on an undefined
> value at ./script line ##.

Will,

DBI includes a trace mechanism. Between that and the TDSDUMP log, perhaps
you'll be able to tell what's wrong. To me, it looks like $dbh is being
closed on you; $sql is probably fine. You can generate that same message
this way:

$ perl -e'print $s->state'
Can't call method "state" on an undefined value at -e line 1.

Have you installed an error handler (syb_err_handler)? If not, you might be
missing a runtime error.

HTH.

--jkl

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