Well, I have following chunk of code:
Qt Code: 
  1. {
  2.     // sets up database paramaters
  3.     m_Database=QSqlDatabase::addDatabase(db_type);
  4.     m_Database.setHostName(db_host);
  5.     m_Database.setUserName(db_username);
  6.     m_Database.setPassword(db_password);
  7.     m_Database.setDatabaseName(db_name);
  8.     // tries to connect to database
  9.     m_bConnectionEstablished=m_Database.open();
  10.     if(!m_bConnectionEstablished)
  11.     {
  12.         //qFatal("Failed to connect to database. Aborting.");
  13. /*
  14.         int ret=QMessageBox::critical(0,
  15.                                       tr("Critical Error"),
  16.                                       tr("Failed to connect to database. Aborting."));
  17. */
  18.         QString errorString(m_Database.lastError().databaseText());
  19.  
  20.         errorString.append(": ");
  21.         errorString.append(m_Database.lastError().driverText());
  22.         int ret=QMessageBox::critical(0,
  23.                                       tr("Critical Error"),
  24.                                       errorString);
  25.  
  26.         qApp->quit();    // terminates application, does not work?!
  27.     }
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What I want to achieve, if database connection fails, application must terminate immediately. qApp->quit() does not work, are there any other ideas?