Error: C2228: left of '' must have class/struct/union

I'm a long time Java user learning C++ with Qt and I'm having a lot of trouble understanding how methods work. Right now, I'm trying to figure out databases, and tried to simplify my code with a header. Normally in Java I would just have a class called DatabaseControl with a void method that would execute whatever I wanted. For example, adding an employee to a database, as I'm doing now. I'd instantiate the class, by doing something like

DatabaseControl myDBControl = new DatabaseControl();

and then execute the method with

myDBControl.addEmploye();

which would bring up the series of input boxes for the user to input the information on the employee - name, department, etc.

So, now over to C++. I have my header

class DatabaseControl
{
public:
    DatabaseControl();
    ~DatabaseControl();

    //Methods
    void addEmployee();
};

I don't have any parameters in my constructors because all I want to do is call the "addEmployee" method in my main as I've shown above. In the same header file I have this below my class declaration

void DatabaseControl::addEmployee(){
QSqlQuery qry;
bool ok;
QString firstName = QInputDialog::getText(NULL, "QInputDialog::getText()",
                                     "Employee first name:", QLineEdit::Normal,
                                     NULL, &ok);
if (ok && !firstName.isEmpty()){}
else{
    QMessageBox msgBox;
    msgBox.setWindowTitle("Error");
    msgBox.setText("Failed to add employee.\nReason: No employee name given.");
    msgBox.exec();
}
QString lastName = QInputDialog::getText(NULL, "QInputDialog::getText()",
                                     "Employee last name:", QLineEdit::Normal,
                                     NULL, &ok);
     if (ok && !lastName.isEmpty()){
         qry.prepare("INSERT INTO employees (firstname, lastname)" "VALUES (:f1, :f2)");
         qry.bindValue(":f1", firstName);
         qry.bindValue(":f2", lastName);
         qry.exec();
     }
     else{
         QMessageBox msgBox;
         msgBox.setWindowTitle("Error");
         msgBox.setText("Failed to add employee.\nReason: No employee name given.");
         msgBox.exec();
     }

}

and then in my main I have this:

void MainWindow::on_addEmployee_clicked()
{
    DatabaseControl myDBControl();
    myDBControl.addEmployee();
}

which I expected to just run the addEmployee method I wrote in the header file. However, when I compile, I get the error Error: C2228: left of '.addEmployee' must have class/struct/union

I've looked at other instances of this error and don't really understand exactly what's wrong, and I feel it comes from my misunderstanding of methods in C++, because I know in Java something like this would work without issue (assuming the code in the header is correct which it very well may not be)