public ArrayList<ExternalUser> getAllExternalUsersFromDatabase(){
        ArrayList<ExternalUser> externalUsers = new ArrayList<>();
        ArrayList<HashMap<String, String>> externalUsers_raw = mySQLQuery.getAllRows("ExternalUser");

        for(HashMap<String, String> externalUser_raw : externalUsers_raw){
            String email = externalUser_raw.get("email");
            int meetingID = Integer.parseInt(externalUser_raw.get("meetingID"));
            String name = externalUser_raw.get("name") == null ? "" : externalUser_raw.get("name");
            String phonenumber = externalUser_raw.get("phonenumber") == null ? "" : externalUser_raw.get("phonenumber");

            externalUsers.add(new ExternalUser(email, meetingID, name, phonenumber));
        }

        return externalUsers;
    }