public function Connect()
{
 if($this->Connected==TRUE)
 {
  echo "Il existe deja une connexion a la base de donnees!";
  return FALSE;  
 }
 
 $this->Connect=mysql_connect($this->Host,$this->User,$this->Pass);
 if($this->Connect==TRUE)
 {
  $this->Connected=TRUE;
  return TRUE;
 }
 else
 {
  $this->Connected=FALSE;
  return FALSE;  
 }    
}

require_once('class_mysql.php');
$mysql=new Mysql('localhost', 'root', '*****');
$mysql->connect();
$mysql->selectDatabase('mysql');
$mysql->queryRecord('select * from db;');
$mysql->disconnect();

Warning: mysql_connect() [function.mysql-connect]: Unknown MySQL server host '*****' (11001) in C:\httpd\Apache2\htdocs\php5\class_mysql.php on line 23

class Mysql
{
 
private $User, $Pass, $Host, $Connected=FALSE, $Connect, $Database, $LastQuery;
 
public function __construct($user, $pass, $host)
{
 $this->User=$user;
 $this->Pass=$pass;
 $this->Host=$host;
}