สอบถามการ Query ข้อมูลจากฐานข้อมูลให้แสดงในหน้าเว็บ

<?php 

$str = "SELECT tb_Center.CenterNo, tb_Function.Function_Name, tb_Contract.Contract_No,tb_Equipment_Type.Equipment_Type, tb_Purchase.Budget_New,
tb_Purchase.Budget_Replace, tb_Equipment.Budget_Price
FROM (tb_Function INNER JOIN (tb_Center_Function INNER JOIN tb_Center ON tb_Center_Function.ID_Center = tb_Center.ID_Center) 
ON tb_Function.ID_Function = tb_Center_Function.ID_Function) 
INNER JOIN ((tb_Equipment_Type INNER JOIN (tb_Contract INNER JOIN tb_Equipment ON tb_Contract.ID_Contract = tb_Equipment.ID_Contract)
ON tb_Equipment_Type.ID_Equipment_Type = tb_Equipment.ID_Equipment_Type) INNER JOIN tb_Purchase ON tb_Equipment.ID_Equipment = tb_Purchase.ID_Equipment) 
ON tb_Function.ID_Function = tb_Purchase.ID_Function 
where tb_Contract.ID_Contract  =".$_GET['Contract_No']." 
and tb_Equiptment_Type.ID_Equiptment_Type =".$_GET['Equiptment_Type']."";
	       
			$Rec->Open($str, $conn, 1, 3);	 // error ตรงนี้ค่ะ
			while (!$Rec->EOF)
	         {	 
				
				 $CenterNo= $Rec->Fields['CenterNo']->Value;
				 $Contract_No= $Rec->Fields['Contract_No']->Value;
				 $Functionname= $Rec->Fields['Function_Name']->Value;
				 $Equipment_Type= $Rec->Fields['Equipment_Type']->Value;
				 $Budget_New = $Rec->Fields['Budget_New']->Value;
				 $Budget_Replace= $Rec->Fields['Budget_Replace']->Value;
				 $Budget_Price= $Rec->Fields['Budget_Price']->Value;
				 $RentMonth = $Budget_Price*($Budget_New+$Budget_Replace);
				 $RentYear = $RentMonth*12;
				 $RentYear3 = $RentYear*3;
?>