Re: Surprising DBD::Oracle error raised

[Martin J. Evans]

On 04/02/14 19:36, David Nicol wrote:

     $price_sth->execute;
     my ($o_file_price) = $price_sth->fetchrow_array();
     if ($price_sth->fetch) {
         $this->log_error('ERROR: scalar select returned second row at
%s line %d', __FILE__, __LINE__);
     }


I expected the fetch to return undef, but it throws an Oracle error.
My best ignorant guess here is that fetchrow_array does some cleanup
on one-row datasets, but that isn't documented.

Advise?

That is in deed interesting. When I run the following with DBD::ODBC to MS SQL 
Server:

use strict;
use warnings;
use DBI;

my $h = DBI->connect();
eval {
    $h->do(q/drop table mje/);
};

$h->do(q/create table mje (a int)/);
my $s = $h->prepare(q/insert into mje values(?)/);
$s->execute(1);
$s->execute(2);

$s = $h->prepare(q/select * from mje where a = 1/);
$s->execute;
my ($row) = $s->fetchrow_array;
print "$row\n";
$row = $s->fetch;
print "$row\n";


I get:

1
Use of uninitialized value $row in concatenation (.) or string at 
mje/fetch_off_end.pl line 20.

However, I get the same with DBD::Oracle so how is you code different from the 
above.

Martin