WampServer

I made a working simple registration php.
then i made a simple databse in wamp..
how can i connect the databes and the php?

<?php
require("const.php";

class mysql{
public $connection;

public function mysql(){
$this->connection = mysql_connect(db_host, db_user, db_pass) or die(mysql_error());
mysql_select_db(db_data, $this->connection) or die(mysql_error());
}

function query($query){
return mysql_query($query, $this->connection);
}
};

/* Create database connection */
$database = new mysql;

?>

const.php

<?php

//define for datasbase
define("db_user", "root";
define("db_pass", "";
define("db_host", "localhost";
define("db_data", "journal";

?>

or

<?php

$host = ' ';
$user = ' ';
$pass = ' ';
$db = ' ';

$q = mysql_connect($host, $user, $pass) or die("Couldn't Connect To Datebase";
mysql_select_db($db, $q) or die("Couldn't Select DataBase";

?>