bool database::setUsernameAndPassword(QString username, QString password) {
    QSqlQuery query;

    QString command = "INSERT INTO users (username, password) VALUES ('%1', '%2');";
    command = command.arg(username)
                     .arg(password);

    qDebug() << "command : " << command;

    if(!query.exec(command) || username == "" || password == "") {
        qWarning() << "ERROR SET USERNAME: " << query.lastError().text();
        return false;
    }
    return true;
}