public function __construct($host = null, $user = null, $pass = null, $dbname = null)
 {
     $this->lorem = LoremIpsumGenerator::getInstance();
     if (!is_null($host)) {
         $this->pdo = new \PDO("mysql:host={$host};dbname={$dbname};charset=utf8", $user, $pass);
         if (!$this->pdo) {
             throw new Exception("Connection error!");
         }
         return true;
     }
 }