DBControllerCreator creator = new MySQLControllerCreator();
DBController connection = creator.create();
connection.openConnect();
connection.executeQuery("Some query.");
connection.closeConnect();
DBControllerCreator creator2 = new OracleControllerCreator();
DBController connection2 = creator2.create();
connection2.openConnect();
connection2.executeQuery("Some query.");
connection2.closeConnect();
}