public static void saveMail(User user, Message message) {

    ResultSet resultSet = null;

    try {

      String sql =
          "INSERT INTO mail (mailid,userid,hash,message) values("
              + message.getId()
              + ","
              + user.getId()
              + ",'"
              + message.getHash()
              + "','"
              + message.getContent()
              + "');";

      getStatement().execute(sql);

      resultSet.close();
      getStatement().close();

    } catch (SQLException e) {
      e.printStackTrace();
    }
  }
  @Deprecated
  public static void addNewMessageToUser(User user, Message message) {

    String sql = "SELECT MAX(mailid) as 'maxid' FROM mail;";

    ResultSet resultSet = null;
    int number = 10000;

    try {
      resultSet = getStatement().executeQuery(sql);

      resultSet.next();
      number = resultSet.getInt("maxid");

      number++;
      sql =
          "INSERT INTO mail (mailid,userid,hash,message) values("
              + number
              + ","
              + user.getId()
              + ",'"
              + message.getHash()
              + "','"
              + message.getContent().replace("'", "\"")
              + "');";

      getStatement().execute(sql);

      resultSet.close();
      getStatement().close();

    } catch (SQLException e) {
      e.printStackTrace();
    }
  }