Having trouble getting MySQL data returned - mysql

Question

I have a long Perl script that in other places returns MySQL table data successfully using binds:
$query2 = "SELECT tblExportFiles.CompID, CompEmail, export_id, export_name, query, num_records, sample_rate, record_startnum, Description, Pull_Type, remote_CompID FROM tblExportFiles INNER JOIN tblCustomers USING(CompID) WHERE done=0 ORDER BY export_id ASC ;";
$sqlQuery2 = $dbh->prepare( $query2 );
$sqlQuery2->execute or die "can't execute the query: " . $sqlQuery2->errstr;
$sqlQuery2->bind_columns(
\$CompID, \$CompEmail, \$export_id, \$fileName,
\$queryFile, \$numRecords, \$sampleRate, \$recStartNum,
\$description, \$qType, \$remote_CompID
);
while ( $sqlQuery2->fetch ) { ... }
But when I do the same sort of query here, it fails to return any values but doesn't throw an error:
my $ftpQuerySQL = "SELECT tblResellersData.http_address ,ftp_address, ftp_username, ftp_password, ftp_dir, http_name, tblResellerCustomers.CompEmail FROM tblResellersData, tblResellerCustomers WHERE tblResellerCustomers.User_ID = '$remote_CompID' AND tblResellersData.CompID = '$CompID' ; ";
print "FTP SQL = $ftpQuerySQL\n\n";
$QueryFTP = $dbh->prepare( $ftpQuerySQL );
$QueryFTP->execute() or die "can't execute the query: " . $QueryFTP->errstr;
$QueryFTP->bind_columns(
\$http_address, \$ftp_address, \$ftp_username, \$ftp_password,
\$ftp_dir, \$remote_name, \$CompEmail
);
$QueryFTP->fetch();
It throws warnings
Use of uninitialized value $ftp_address in concatenation (.) or string at ./Cron_file_output.pl line 302.
Use of uninitialized value $ftp_dir in concatenation (.) or string at ./Cron_file_output.pl line 302.
Use of uninitialized value $ftp_username in concatenation (.) or string at ./Cron_file_output.pl line 302.
is a located in
Use of uninitialized value $ftp_dir in scalar chomp at ./Cron_file_output.pl line 303.
Use of uninitialized value $http_address in concatenation (.) or string at ./Cron_file_output.pl line 304.
Use of uninitialized value $ftp_address in concatenation (.) or string at ./Cron_file_output.pl line 304.
Use of uninitialized value $ftp_username in concatenation (.) or string at ./Cron_file_output.pl line 304.
Use of uninitialized value $ftp_password in concatenation (.) or string at ./Cron_file_output.pl line 304.
Use of uninitialized value $ftp_dir in concatenation (.) or string at ./Cron_file_output.pl line 304.
Use of uninitialized value $remote_name in concatenation (.) or string at ./Cron_file_output.pl line 304.
RETURNED VALUES......., , , , , , j#adki87.com
Use of uninitialized value $ftp_address in concatenation (.) or string at ./Cron_file_output.pl line 310.
But when I ran the same SQL under phpMyAdmin, it gave this result:
http_address website's url ftp_address ftp_username ftp_password ftp_dir http_name
http://www.highpeaksbyway.com/ highpeaksbyway.com data#highpeaksbyway.com dataUUU666##) pulls/ TEST ME

Answer 1

What are lines 302, 304, and 310?
It looks like your criteria (the WHERE conditions) are failing, and the statement returns no records
What does $QueryFTP->fetch return? You need to check its status before you use it. That is the major difference between the code that you think "works" and your problem case
You need to check the values of $CompID and $remote_CompID before the execute. You should also use placeholders in the prepare call, and supply the values in execute