bug in DBD::MySQL on Ubuntu / Sarge

Hi,

I have come across a problem in DBD::MySQL while porting code from Woody
to Sarge and Ubuntu (both hoary and breezy).

The following script creates a simple test table and attempts to perform
6 updates.  The first 3 updates work correctly, but in the final 3
updates, the key is erroneously taken as NULL:

#! /usr/bin/perl5 -w

use strict;
use DBI;

my $dbh = DBI->connect( "dbi:mysql:test:host=chadwick:port=3306", 
                        'testuser', 'test', {RaiseError=>1, PrintError=>0} );


$dbh->do( "drop table if exists update_bug" );
$dbh->do( "create table update_bug( k int not null primary key, status int not 
null )" );

my $v = '4000930012345671';

$dbh->do( "update update_bug set status = 5 where k = ?", undef, substr( $v, 
-11 ) );  # OK
$dbh->do( "update update_bug set status = 5 where k = ?", undef, substr( $v, 
-11 ) );  # OK

cancel( $v );  # OK
cancel( $v );  # bug - k is NULL
cancel( $v );  # bug - k is NULL
cancel( $v );  # bug - k is NULL

sub cancel {
  my ( $dcref ) = @_;
  print  "DCREF: $dcref\n";
  $dbh->do( "update update_bug set status = 5 where k = ?", undef, substr( 
$dcref, -11 ) );
}

  

In the Query log of the 4.1.11 database we're connecting to, we see:

060526 14:24:52    4605 Connect     testuser@chadwick on test
                   4605 Query       SET AUTOCOMMIT=1
                   4605 Query       drop table if exists update_bug
                   4605 Query       create table update_bug( k int not null 
primary key, status int not null )
                   4605 Query       update update_bug set status = 5 where k = 
'30012345671'
                   4605 Query       update update_bug set status = 5 where k = 
'30012345671'
                   4605 Query       update update_bug set status = 5 where k = 
'30012345671'
                   4605 Query       update update_bug set status = 5 where k = 
NULL
                   4605 Query       update update_bug set status = 5 where k = 
NULL
                   4605 Query       update update_bug set status = 5 where k = 
NULL
                   4605 Quit

  

The problem seems to be related to the fact that a substring expression
is passed as an argument to DBI::do, but only when the DBI::do is called
within a subroutine.

I'm stumped here.  Is this a bug in Perl or DBD::MySQL, or just the
versions on Sarge and Ubuntu ?

regards,
Martin




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