Adding data to the database

The Qt documents state that it is not a best practice to keep the QSqlDatabase object around.

Here are a few different ways we could go about this:

1.  We could use QSqlDatabase::database to grab an instance of the opened database:

QSqlDatabase db = QSqlDatabase::database("MAEPQTdb");
QSqlQuery q("", db);
q.exec("insert into Mobile values (0, 'iPhone', '6SE', '12.1.2')");
q.exec("insert into Mobile values (1, 'Moto', 'XT1710-09', '2')");
q.exec("insert into Mobile values (1, 'rpi', '1', '1')");
q.exec("insert into Mobile values (1, 'rpi', '2', '2')");
q.exec("insert into Mobile values (1, 'rpi', '3', '3')");

2. We can also use another function...