public ResultSet getUser(String nickname,String password){
    ResultSet resSet = null;

    String sql = "SELECT * FROM dvsusers WHERE username=? AND password=?";

    try (PreparedStatement prSt = getDbConnection().prepareStatement(sql)) {

      prSt.setString(1, nickname);
      prSt.setString(2, password);

      resSet = prSt.executeQuery();

    } catch (SQLException | ClassNotFoundException e) {
      e.printStackTrace();
    }
      return resSet;
  }