Here my code

my $req = <STDIN>;
my $sth = $dbh->prepare( qq{
SELECT tr_code,j_trs from t_ghos
} ) or die "Can't prepare statement: $DBI::errstr";
$sth->execute or die "Can't execute statement: $DBI::errstr";
my $rows = $sth->fetchall_arrayref();
my $num_rows = @$rows;
if($num_rows > 0)
{

process($sth,$req);

}

sub process
{
my $sth = shift;
my $type = shift;
        
        while (my $row = $sth->fetchrow_hashref)
        {
       
            next unless defined($row);
}
}
[download]

Now please tell me any solution to count the number of rows