text: #ifndef MAINWINDOW_H
  #define MAINWINDOW_H
  
  #include <QMainWindow>
  #include "DatabaseConnection.h"
  
  namespace Ui
  {
  class MainWindow;
  }
  
  class QSqlQueryModel;
  
  class MainWindow : public QMainWindow
  {
      Q_OBJECT
  public:
      explicit MainWindow(QWidget *parent = nullptr);
      ~MainWindow();
  private slots:
      void on_actionSalir_del_programa_triggered();
      void on_actionAcerca_de_Qt_triggered();
      void on_actionAcceder_a_Microsoft_SQL_Server_2012_triggered();
  private:
      Ui::MainWindow *ui;
      DatabaseConnection mDbConnection;
      QSqlQueryModel *mModel;
  };
  
  #endif // MAINWINDOW_H
  