Does QSqlQuery hold a smart DB pointer?

Question

Database

There are three questions.
1. Is QSqlDatabase a smart pointer? What will happen from such a code?

QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
// ну, в общем, откроем его…
QSqlDatabase dbCopy = db;

2. Same with QSqlQuery.
3. Does QSqlQuery hold a smart pointer to the database? Does such code work?

QSqlQuery getQuery() {
  QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
  // в общем, откроем…
  return QSqlQuery("SELECT * FROM table", db);
}

Answer 1

Finally figured it out.
1. Yes.
2. Yes.
3. Yes.