Retrieve OrderID

[cslinux]

While trying to retrieve orderid from function actionhook_InvoicePaid($vars) , always i got $vars["OrderID"] =3 , here's how I'm querying the DB as follows :

$sbquery1 = "SELECT domain FROM tbldomains WHERE (orderid = " .$vars["OrderID"] . ")";

$result1 = mysql_query($sbquery1);

 

if (!$result1) {

echo "Could not successfully run query ($sbquery1) from DB: " . mysql_error();

 

}

 

print "The OrderID :" . $vars["OrderID"] . "<p>";

 

May anyone correct me if i'm wrong ?, i'll do appreciate it.

Thanks