รบกวนถามการเขียน function อัพเดท สถานะแต่ละรายการ php ajax

<td align="center"><select name="status" id="status" class="form-control" onchange="updateStatus2(<?=$arr1['order_detailID'];?>,this.value)" >
                <option value="1" > อนุมัติ</option>   <option value="0" <?php  echo $aa = ($arr1[status] == 0) ? 'selected' : ''; ?> > ไม่อนุมัติ</option>   
				</select></td>
 <script src="ajax/jquery-1.11.2.min.js"></script>        
<script type="text/javascript">
function updateStatus2(id,sta) { 

alert('อัพเดทสถานะการอนุมัติ');


$.ajax({ url: 'ajax/save_app.php',
data: {id:id,sta:sta},
type: 'post',
success: function(output) {
 // alert('');
 location.reload();
  $( "#view" ).html(output);	

}
});
}
</script>

<?php
ob_start();
include "../conn2/session.php";
include "../conn2/session_secure.php";
include("../conn2/connect_db_server.php");
connect();
$user_id=$_POST['userId'];
$assetId = $_POST['id'];

#var_dump($_POST);

if ($_POST['sta'] == '1') {
	/*$aSId = file($user_id.'-assetId.txt');
	$file = fopen($user_id."-assetId.txt","a+");
	fwrite($file,$assetId."\r\n");
	fclose($file);*/
	
	$status = (isset($_POST['sta']) && $_POST['sta'] == '1') ;
	$sql="update tb_order_detail set status='$status' where order_detailID='$assetId'";
	$resul=mysql_query($sql);
	echo "Update Status Store";


} else if ($_POST['sta'] == '0') {
	$status = (isset($_POST['sta']) && $_POST['sta'] == '0') ;
	/*$sql="update asset_request_detail set ast_req_status='$status' where ast_req_d_id='$assetId'";
	$resul=mysql_query($sql);
	echo "Update Status";*/
	$upSta["ast_req_status"] = $_POST['sta']; 
	 $rs = $conn->Execute("select * from tb_order_detail where order_detailID='$assetId' ");
 	 $sql = $conn->GetUpdateSQL($rs,$upSta);
      $result = $conn->Execute($sql);
}
?>