QDataTable not visibility?

[Dmitry]

Why I not see table?

class MyDB  : public QWidget {
 Q_OBJECT
public:
   MyDB( QWidget *parent=0, const char *name=0 )  : QWidget(parent,name) {
   QSqlDatabase* p = QSqlDatabase::addDatabase("QMYSQL3");
   p->setDatabaseName("base1");
   p->setUserName("root");
   p->setHostName("localhost");
   p->setPassword("123");
   p->open();
 
   QSqlCursor cursor("table1");
   QDataTable tb(&cursor);
   tb.addColumn("fam","fam");
   tb.addColumn("name","name");
   tb.refresh();
 
   }
};
 
#include "main.moc"
 
int main(int a,char**b){
   QApplication app(a,b);
   MyDB db;
   db.setGeometry(100,100,400,300);
   db.show();
   app.setMainWidget(&db);
   return app.exec();
}

class MyDB  : public QWidget {
 Q_OBJECT
public:
   MyDB( QWidget *parent=0, const char *name=0 )  : QWidget(parent,name) {
   QSqlDatabase* p = QSqlDatabase::addDatabase("QMYSQL3");
   p->setDatabaseName("base1");
   p->setUserName("root");
   p->setHostName("localhost");
   p->setPassword("123");
   p->open();

   QSqlCursor cursor("table1");
   QDataTable tb(&cursor);
   tb.addColumn("fam","fam");
   tb.addColumn("name","name");
   tb.refresh();

   }
};

#include "main.moc"

int main(int a,char**b){
   QApplication app(a,b);
   MyDB db;
   db.setGeometry(100,100,400,300);
   db.show();
   app.setMainWidget(&db);
   return app.exec();
}

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if code inside MyDB(...) {} move inside main() then i am see table?

[wysota]

Because you create it on stack and it goes out of scope and is destroyed when the constructor returns.