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QSqlDatabase db;

    db = QSqlDatabase::addDatabase("QPSQL");
    db.setHostName("localhost");
    db.setDatabaseName("test");

        db.close();
        if (role)
        {
            db.setUserName(...);
            db.setPassword(...);
        }
        else
        {
            db.setUserName(...);
            db.setPassword(...);
        }
    if (db.open())
    {
        qDebug() << "NORM CONNECT" << db.userName();
    }
    else
    {
        qCritical() << db.lastError();
    }  

QSqlDatabasePrivate::removeDatabase: connection 'qt_sql_default_connection' is still in use, all queries will cease to work.

Connect::~Connect()
{
    db.close();
    db.removeDatabase("QPSQL");
}

  Autorization * atr = new Autorization();

    Connect * first_connect = new Connect();

    return a.exec();
    delete first_connect;
    first_connect = NULL;