ผมรบกวนสอบถามเรืองการเชื่่อมต่อ database มีปัญจากการ connecttion จะแก้อย่าไงหรครับ

<?
			$conn = mysql_connect('localhost','root',' 9899')
			or die("ไม่สามารถติดต่อ MySql ได้");
			mysql_select_db("db_eng")
			or die ("ไม่สามารถเลือกใช้งานฐานข้อมูลได้");
			mysql_query("SET NAMES tis620"); 
?>

<?
  error_reporting(1);
        class admin_control {
                // ======= Start variable of class ===========
              /*var $host     = "localhost";
                var $database = "thawangpha_1";
                var $user     = "thawangpha_1";
                var $password = "9899";*/

		var $database = "db_eng";
               var $user     = "root";
                var $password = "9899";

                var $link_con = 0;
                var $sqlquery;
                var $result;
                var $count;
                var $ERRNO;
                var $ERROR;
				var $totalpage;
				var $startx;
                // ======= Stop variable of class ===========
                
                // ======= Start method of class ===========
                function admin_control () {
                         	global $HTTP_HOST;
                          	$this->link_con = mysql_connect($this->host,$this->user,$this->password);
                          	mysql_select_db($this->database,$this->link_con);
       				mysql_db_query($this->database,"SET NAMES tis620");
           }

                function send_cmd($query){
                          	$this->sqlquery  = $query;
                          	$this->result    = mysql_query($query,$this->link_con);
                          	$this->ERRNO = mysql_errno();
                          	$this->ERROR = mysql_error();
                          	$this->count =  mysql_num_rows($this->result);
                          	return $this->count;
                }

                function get_id () {
                        	return mysql_insert_id($this->link_con);
                }

                function get_data(){
                          	return mysql_fetch_row($this->result);
                }
				function fetch_data(){
							return mysql_fetch_array($this->result);
				}

                function data_seek($torow){
                          	return mysql_data_seek($this->result,$torow);
                }

                function num_rows(){
                          	return $this->count;
                }
				
				function page_count($data_record,$pagesize,$pageid){
				
							$this->totalpage = (int)($data_record / $pagesize);
							if(($data_record % $pagesize) != 0){
									$this->totalpage += 1;
							}
							if(isset($pageid)){
									$this->startx = $pagesize * ($pageid -1);
							}else{
									$pageid = 1;
									$this->startx = 0;
							}
							return $this->startx;
				}

                function show_error() {
                        	echo $this->sqlquery."<br>".mysql_errno().":".mysql_error();
                }

                function free_result(){
                          	mysql_free_result($this->result);
                }

                function close() {
                          	mysql_close($this->link_con);
                }
				
				function convert_date($date) 
				{
							list ($YYYY, $MM, $DD) = split ('[/.-]', $date);
							$date_out="$DD/$MM/$YYYY";
							return $date_out;
				}
				function convert_date_to_db($date) 
				{
							list ($YYYY, $MM, $DD) = split ('[/.-]', $date);
							$date_out="$YYYY-$MM-$DD";
							return $date_out;
				}
                // ======= Stop method of class ===========
        } 
// end of class
   $db = new admin_control();
        //---------------- Setup Enviralment --------

/*function textreplace($text){
	$searchtext ="\"";
	$replacetext="&quot;";
	return str_replace ($searchtext, $replacetext, $text); 
}
function inservalue($text){
	$searchtext ="\'";
	$replacetext="''";
	return str_replace ($searchtext, $replacetext, $text); 
}*/

function textreplace($text){
	$searchtext ="\"";
	$replacetext="&quot;";
	return str_replace ($searchtext, $replacetext, $text); 

}
function inservalue($text){
	$searchtext ="\'";
	$replacetext="''";
	return str_replace ($searchtext, $replacetext, renHTML($text)); 	
}

function querysql($text){
	$searchtext ="\'";
	$replacetext="''";
	return str_replace ($searchtext, $replacetext, $text); 	
}




//?????????  renHTML()  ????????????????????????????????  HTML  ???????????????????????????????????
function renHTML($strTemp){
		$strTemp = nl2br(htmlspecialchars($strTemp));
		return $strTemp;
	}
?>

<?php

class db {

 var $host;
var $pass;
var $db_name;
var $charset;

function __construct() {
$this->host = 'localhost';
$this->user = 'root';
$this->pass ='root';
$this->db_name = 'db_name';
$this->charset = 'utf-8';
}

function connect() {
$conn = mysql_connect($this->host, $this->user, $this->pass);

if($conn) {

mysql_select_db($this->db_name);

mysql_query('SET NAMES '.$this->charset);

}
return $conn;

}

}

?>

<?php
include_once 'db.php';
$db = new db();
$conn = $db->connect();

if($conn)
{
echo 'ติดต่อได้';
}
else
{
echo 'ติดต่อไม่ได้';
}

?>