public void nimmtTeil(int terminID, int userID) throws SQLException{
        PreparedStatement prepResetPW = con.prepareStatement("UPDATE terminkalender SET nimmtTeil = ? WHERE terminID = ? AND userID = ?");
        prepResetPW.setInt(1, 1);
        prepResetPW.setInt(2, terminID);
        prepResetPW.setInt(3, userID);
        prepResetPW.execute();
    }