MySQL没有显示错误

Question

我已经为MySQL创建了一个类，但它似乎没有显示错误。

class MySQL
  {

public static function connect(){
          $confFile = new ConfigFile( AB_BASE_PATH . AB_CONFIG_FILE );
          $Host = $confFile->getDbHost();
          $Database = $confFile->getDbName();
          $User = $confFile->getDbUser();
          $Password = $confFile->getDbPwd();

          $con = mysqli_connect($Host,$User,$Password,$Database) or die("Could not connect. " . mysql_error());
          return $con;

    }

public function query($SQL){
      $r = mysqli_query($this->connect(),$SQL) or die(mysqli_error($this->connect()));
      return mysqli_fetch_array($r);
    }

}

这就是我调用查询的方式：

$Row = $MySQL->query("SELECT * FROM Contacts");