Re: Perl error: fetchrow_hashref failed - Mailing list pgsql-general

All I can say is I get no errors of this kind in my code, which runs

 $sth=$dbh->prepare("select param1,param2 from sometable");
 $sth->execute;

 while (@resultset = $sth->fetchrow_array) {
     ...... do something with them .
   }
$sth->finish;


I don't think calling $sth-finish should make the difference, but maybe if
you have already used $sth once there is a problem?
Try it anyway :->
----------------------------------------------------------------
Moray.McConnachie@computing-services.oxford.ac.uk
----- Original Message -----
From: "Jeffrey" <seesej@uswest.net>
To: "Moray McConnachie" <moray.mcconnachie@computing-services.oxford.ac.uk>;
<pgsql-general@postgresql.org>
Sent: Wednesday, April 12, 2000 12:57 PM
Subject: Re: [GENERAL] Perl error: fetchrow_hashref failed


> Your script works fine, but I still get the same error.
>
> I can duplicate this same error with a non-hash ref like this.
>
> $sth=$dbh->prepare("select param1,param2 from sometable");
> $sth->execute;
>
> while (($param1,$param2) = $sth->fetchrow_array) {
>     ...... do something with them .
>   }
>
> My concern is, does the error fetchrow_hashref or _array cause any
problems
> with the server, postmaster, postgres, etc. I am about to turn a site on
> with lots of traffic and I don't want to crash because of these errors.
>
> Thank you
> js
>
> > From: "Moray McConnachie"
<moray.mcconnachie@computing-services.oxford.ac.uk>
> > Date: Wed, 12 Apr 2000 12:45:42 +0100
> > To: "Jeffrey" <seesej@uswest.net>, " " <pgsql-general@postgresql.org>
> > Subject: Re: [GENERAL] Perl error: fetchrow_hashref failed
> >
> >
> > ----- Original Message -----
> > From: "Jeffrey" <seesej@uswest.net>
> > To: <pgsql-general@postgresql.org>
> > Sent: Wednesday, April 12, 2000 10:05 AM
> > Subject: [GENERAL] Perl error: fetchrow_hashref failed
> >
> >
> >> Hi, I wonder if I might tap the vast knowledge here againg.
> >>
> >> I have a perl script that is looping through a statement handle like th
is.
> >>
> >> $statement = "select * from sometable";
> >> $sth=$dbh->prepare($statement);
> >> $sth->execute();
> >>
> >> # here is the part I have a question about.
> >> while (%hash_ref = %{$sth->fetchrow_hashref}) {
> >>
> >> while (($k,$v) = each (%hash_ref)) {
> >> print ("\n$k == $v"); }
> >> }
> >
> > I don't think your first loop will work because the %{$b} where $b is
undef
> > will not produce an undef - I think.
> >
> > See if this works? It ought to be more efficient anyway, because you
only
> > need one hash in my version, not two like your routine (that created by
the
> > fetchrow_hashref call and the hash %hashref itself.
> >
> > while (defined $hash_ref=$sth->fetchrow_hashref) {
> > while (($k,$v)=each %$hashref) {
> > print ("\n$k==$v");
> > }
> > }
> >
> >
> >
> >
>
>
>