ขอถามเรื่องการดึงข้อมูลจาก sql โดยใช้ ajax ครับ

function getDataFromDb()
{
	$.ajax({ 
				url: "getData.php" ,
				type: "POST",
				data: ''
			})
			.success(function(result) { 
				var obj = jQuery.parseJSON(result);
					if(obj != '')
					{
						  //$("#myTable tbody tr:not(:first-child)").remove();
						  $("#myBody").empty();
						  $.each(obj, function(key, val) {
									var tr = "<tr>";
									tr = tr + "<td>" + val["CustomerID"] + "</td>";
									tr = tr + "<td>" + val["Name"] + "</td>";
									tr = tr + "<td>" + val["Email"] + "</td>";
									tr = tr + "<td>" + val["CountryCode"] + "</td>";
									tr = tr + "<td>" + val["Budget"] + "</td>";
									tr = tr + "<td>" + val["Used"] + "</td>";
									tr = tr + "</tr>";
									$('#myTable > tbody:last').append(tr);
						  });
					}

			});

}

setInterval(getDataFromDb, 10000);   // 1000 = 1 second