สอบถามหน่อยครับไม่ทราบว่าเกิดจากอะไร query ใน mysql ออก แต่ใน php ไม่ออก

<?php
	include ('connect.php');
	$sql = "select * from tb_staff where status=1 and status_ot=1 and nationality='ไทย' ";
	$query = mysql_query($sql) or die(mysql_error());
	$x = mysql_num_rows($query);
	echo $x;	
?>

<?php

//code here...

?>

<?php
//*** database connection config ***//
$cdata = array(
						"host"		=>"127.0.0.1",
						"user"		=>"root",
						"pass"		=>"",
						"dbname"	        =>"",
						"charset"	        =>"SET NAMES UTF8"
		);

$con = mysql_connect ($cdata["host"], $cdata["user"], $cdata["pass"]) or die (mysql_error());
mysql_select_db($cdata["dbname"]) or die(mysql_error());
mysql_query($cdata["charset"]);	
?>