getting 0 to print

[rbc]

Dear Monks,

I have am writing a script that will create sqlldr control
files for me. I am having trouble printing 0.
I am sure this a common problem that you wise monks have
seen before and have overcome with easy.
Here's my script:

#!/usr/bin/perl -w
use strict;
use DBI;

my $table    = shift;
my $dbuser     = shift;
my $dbpass     = shift;
my $dbname     = shift;
my $dbd     = 'Oracle';
my $dbh     = DBI->connect ( $dbname, $dbuser, $dbpass, $dbd);
if (!$dbh) {
    die "$0 Error conecting to DB ($dbuser/$dbpass\@$dbname); $DBI::er
+rstr\n";
}


my $SQL = <<SQL;
Select
    *
from
    $table 
SQL

$dbh->{LongReadLen} = 65500;
my $sth = $dbh->prepare($SQL) || die $dbh->errstr;
$sth->execute();
my $colNames = $sth->{'NAME'};
my $nColumns = $sth->{'NUM_OF_FIELDS'};
print <<DOIT;
OPTIONS (ROWS=1)
LOAD DATA 
INFILE *
REPLACE INTO TABLE $table
FIELDS TERMINATED BY '|' TRAILING NULLCOLS
(
DOIT
my $colString;
for my $colName ( @$colNames ) {
    $colString .= "\n\t$colName,";
}
chop($colString);
print "$colString\n";
print<<DOIT;
)
BEGINDATA
DOIT
while ( my @r = $sth->fetchrow_array ) {
#    print join ( '|', @r );
# This causes another bug of putting 0's where 
# I wanted || outputted :(
#    print join ( '|', map ( $_ || '0', trim( @r )) );
#
    print join ( '|', map ( $_, trim( @r )) );
    print "\n";
}
$sth->finish || die;
$dbh->disconnect;

sub trim { 
    my @out = @_; 
    if ( !defined(@_)) {return "";}
    if ( $#out == -1 ) {return "";}
    for(@out) { 
        #next if !($_);
        if (!($_)) { $_ = ""; }
        s/^\s+//; 
        s/\s+$//; 
        s/\|//g; 
        s/\n//g; 
        s/\cM//g; 
        s/\r//g; 
    } 
    return wantarray ? @out : $out[0]; 
}

And here is a example of the bug:

OPTIONS (ROWS=1)
LOAD DATA 
INFILE *
REPLACE INTO TABLE DECODE_TABLE
FIELDS TERMINATED BY '|' TRAILING NULLCOLS
(

        VALUE,
        DESCRIPTION
)
BEGINDATA
1|Something
2|Something else
3|Sometimes
4|Never
5|Always
6|Only once in a while
7|Once in a bluemoon
|All the time

Note the line ...

|All the time

... should of been outputted as ...

0|All the time

As per this query below ...

$ sqlplus blah...

SQL> select * from DVAL_ADR_AVAIL
  2  /

V DESCRIPTION
- ------------------------------
1 Something
2 Something else
3 Sometimes
4 Never
5 Always
6 Only once in a while
7 Once in a bluemoon
0 All the time

8 rows selected.

Please help! Thanks :)