Hi pg, I used the following to do the test earlier:
#!C:/Perl/bin/perl
use strict;
use DBI;
use DBD::Sybase;
use Data::Dumper;

my $dbh = DBI->connect("dbi:Sybase:server=SERVER;database=DATABASE",  
+                          "USER","PASSWORD")
    or die "Can not connect to database!";

my $sth = $dbh->prepare( qq{ select amount from trades_gdw_total });

$sth->execute();

while (my $rows = $sth->fetchall_arrayref([0], 3)) {
  last if ($#$rows <= 0);
  for (@$rows) {
    print "got @$_\n";
  }
  print "---\n";
}

[download]

And I got the desired behaviour, with no errors reported. I am using DBI version 1.39, with DBD::Sybase, by the way.

I studied the source code of DBI, and extracted the following code concerning the behaviour of fetchall_arrayref:
  # we copy the array here because fetch (currently) always
  # returns the same array ref. XXX

  if ($slice && @$slice) {
    
    # if called with [0]

    $max_rows = -1 unless defined $max_rows;
    push @rows, [ @{$row}[ @$slice] ]
      while($max_rows-- and $row = $sth->fetch);
  }
  elsif (defined $max_rows) {

    # if called with undef

    $max_rows = -1 unless defined $max_rows;
    push @rows, [ @$row ]
      while($max_rows-- and $row = $sth->fetch);
  }
  else {
    push @rows, [ @$row ] while($row = $sth->fetch);
  }

[download]

And everything points to fetch.

In reply to Re: Re: Re: DBI::fetchall_arrayref() error by Roger
in thread DBI::fetchall_arrayref() error by blokhead

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.