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    my $sth = $dbh->prepare("
        INSERT INTO foo (first_col,second_col) VALUES (?,?)
    ");
    $sth->execute( $string, $number );

    my $DEBUG = 1; # comment out when not debugging
    my $sql = "INSERT INTO foo (first_col,second_col) VALUES (?,?)";
...
    print "$sql\n[@params]\n" if $DEBUG;
    my $sth = $dbh->prepare( $sql );
    $sth->execute( @params );