my $orderid = $q->param('orderid');

<input type="hidden" name="ordid" value="$hr->{'OrderID'}"/>

##</code><code>##

my $sql = qq! UPDATE
                   "Order_Details"
                SET
                   "UnitPrice" = ?,
                   "Quantity"  = ?,
                   "Discount"  = ?
                WHERE "OrderID" = ? !;
               
  my $count = $dbh->do( $sql,undef,$orderid );