//控制死窗体

    int width = this->geometry().width();

    int height = this->geometry().height();

    this->setFixedSize(width,height);

 　　//定时器的使用

     　QTimer *serialReadTimer = new QTimer;        
　　　 connect(serialReadTimer,SIGNAL(timeout()),this,SLOT(readSerial()));

      serialReadTimer->start();

 // set display color size

        QBrush myBrush;

        QPalette myPalette;

        myBrush = QBrush(Qt::red,Qt::DiagCrossPattern);

        myPalette.setBrush(QPalette::Text,myBrush);

        ui->showDatabase->setPalette(myPalette);

        ui->showDatabase->setFont(QFont("Timers",));

 //qSqlTableModel tableView的使用

     model = new QSqlTableModel(this,db);

     model->setTable("node");

     //手动提交

         model->setEditStrategy(QSqlTableModel::OnManualSubmit);

         //修改tableView的列名

         model->setHeaderData(,Qt::Orientation::Horizontal,"state");

         model->select();

         ui->showDatabase->setModel(model);

         //根据内容自适应

         ui->showDatabase->resizeColumnsToContents();

         //hide header id

         QHeaderView *headerView = ui->showDatabase->verticalHeader();

         headerView->setHidden(true);

      //关闭数据库

     db.close();