Okay. So here is my revised code. Is this okay?

QueryView.hpp:

Qt Code:
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QueryView.cpp:

Qt Code: 
  1. QueryView::QueryView()
  2. {
  3. 	connect(SignalClass.get(),SIGNAL(updateViewSignal(QueryTerm&)), this, SLOT(updateView(QueryTerm&)));
  4. 	connect(queryButton, SIGNAL(clicked()),this, SLOT(doQuery()));
  5. }
  6.  
  7. void QueryView::doQuery()
  8. {
  9. 	t = new QThread()
  10. 	emit fSignalClass->stopExistingQuery();
  11. 	std::shared_ptr<QueryAction> action = std::make_shared<QueryAction>(queryTerm);
  12. 	action->moveToThread(t);
  13. 	t->start();
  14. 	emit fSignalClass->excuteSignal();
  15.  
  16. }
  17.  
  18. QueryView::updateView(QueryTerm& term)
  19. {
  20. 	...update view with query result
  21. }
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QueryAction class:

Qt Code: 
  1. QueryAction::QueryAction(QueryTerm& queryTerm): fQueryTerm(queryTerm)
  2. {
  3. 	connect(SignalClass.get(), SIGNAL(excuteSignal()), this, SLOT(startSearch()));
  4. 	connect(SignalClass.get(), SIGNAL(stopExistingQuery()), this, SLOT(stopQuery()));
  5. 	continueQuery = true;
  6. }
  7.  
  8. void QueryAction::startSearch()
  9. {
  10. 	//init cursor
  11. 	while (db_cursor != empty)
  12. 	{
  13. 		...get query result
  14. 		if (continueQuery)
  15. 			emit fSignalClass->updateViewSignal(aResult);
  16. 	}
  17. }
  18.  
  19. void QueryAction::stopQuery()
  20. {
  21. 	continueQuery = false;
  22. }
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