Qt Code: 
  1. ///////////////////////////////////////////////////////// MAIN.CPP
  2.  
  3. PostgresDriver* driver = new PostgresDriver("localhost" , 5432 , "database" , "user" , "user" , "main");
  4.  
  5. QListIterator<QSqlRecord> i( driver->executeQuery( "SELECT * FROM WHATEVER" ) );
  6.     while( i.hasNext() ){
  7. }
  8. driver->deleteLater();
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Works perfectly.

Now:

Qt Code: 
  1. ///////////////////////////////////////////////////////// AGENT.H
  2.  
  3. class Agent : public QObject
  4. {
  5.     Q_OBJECT
  6. public:
  7.     Agent(QString class_name = "Agent");
  8.     ~Agent();
  9.  
  10.     // GETTERS
  11.     unsigned int getId();
  12.     QString getClass();
  13.  
  14. slots:
  15.     virtual void start();
  16.     virtual void end(){this->deleteLater();}
  17.  
  18. private:
  19.  
  20.     // INCREMENTAL FOR IDS
  21.     static unsigned int counter;
  22.  
  23.     unsigned int id;
  24.     QString class_name;
  25. };
  26.  
  27. ///////////////////////////////////////////////////////// AGENT.CPP
  28.  
  29. #include "Agent.h"
  30.  
  31. unsigned int Agent::counter = 0;
  32.  
  33. Agent::Agent(QString class_name) : QObject()
  34. {
  35.     this->id = ++Agent::counter;
  36.     this->class_name = class_name;
  37.     this->setObjectName( QString("%1%2").arg( this->getClass() ).arg( this->getId() ) );
  38. }
  39.  
  40. Agent::~Agent() {
  41.     this->thread()->deleteLater();
  42. }
  43.  
  44. unsigned int Agent::getId(){
  45.     return this->id;
  46. }
  47.  
  48. QString Agent::getClass(){
  49.     return this->class_name;
  50. }
  51.  
  52. void Agent::start(){
  53.     PostgresDriver* db = new PostgresDriver("localhost" , 5432 , "database" , "user" , "user" , this->objectName() ); //CRASHES
  54. }
  55.  
  56. ///////////////////////////////////////////////////////// MAIN.CPP
  57.  
  58.         Agent* agent = new Agent("Car");
  59.         QThread *thread = new QThread( );
  60.         agent->moveToThread( thread );
  61.         agent->connect( thread, SIGNAL( started() ), agent, SLOT( start() ) );
  62.         thread->start();
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Crashes when creating a PostgresDriver inside the Agent.