QTimer single shot and too busy app.

[Pier]

Another option is to use QApplication:rocessEvents()

I see. It works.
I inserted QApplication:rocessEvents() inside the while loop:

while(sqlalarm)
{
  mysql_real_query(&mysql, comando.constData(), comando.size());
  QCoreApplication::processEvents();
}

while(sqlalarm)
{
  mysql_real_query(&mysql, comando.constData(), comando.size());
  QCoreApplication::processEvents();
}

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and it works.

Which is the best approach in your opinion? This with the processEvents or creating an extra thread?