The code we just described is fully functional. But it can be strengthened, specifically with the AlbumDao::albums() function. In this function, we iterate through the database rows and create a new Album to fill a list. We can zoom in on this specific code section:

QVector<Album*> list; 
while(query.next()) { 
    Album* album = new Album(); 
    album->setId(query.value("id").toInt()); 
    album->setName(query.value("name").toString()); 
    list.append(album); 
} 
return list; 

Let's say that the name column has been renamed to title. If you forget to update query.value("name"), you might run into trouble. The Qt framework does not rely on exceptions, but this cannot be said for every API available in the wild. An exception here would cause a memory leak: the Album* album function has...