<?php
    class Db {
        private $dsn = 'mysql:host=localhost;dbname=loja';
        private $user='root';
        private $pass = '';
        public $db;
        public function __construct(){
            $this->db = new PDO('mysql:host=localhost;dbname=loja', 'root', '');
        }
        public function query($sql){
            return $this->db->query($sql);
        }
}