Hi, I am checking this code but I don't understang how to show more lines.

Qt Code: 
  1. #include "MainWidget.h"
  2.  
  3. MainWidget::MainWidget(QWidget *parent) :
  4.     QWidget(parent)
  5. {
  6.     CurrentQueryModel = 0;
  7.     //CurrentRecord = 0;
  8.     DataSourceConnected = false;
  9.     tbvStudentList = new QTableView(this);
  10.     dlgUpdate = new StudentUpdateDialog(this);
  11.     btnUpdate = new QPushButton("Update", this);
  12.     mainLayout = new QGridLayout(this);
  13.  
  14.     connect(btnUpdate, SIGNAL(clicked()), this, SLOT(clickedButtonUpdate()));
  15.     connect(this, SIGNAL(clickedUpdate()), dlgUpdate, SLOT(show()));
  16.     connect(this, SIGNAL(changedRecord(QSqlRecord)),
  17.             dlgUpdate, SLOT(changeRecord(QSqlRecord)));
  18.     connect(dlgUpdate, SIGNAL(executeQuery(QString)),
  19.             this, SIGNAL(executeUpdate(QString)));
  20.  
  21.     mainLayout->addWidget(tbvStudentList,0, 0, 1, 1);
  22.     mainLayout->addWidget(btnUpdate,1, 0, 1, 1);
  23.  
  24.     this->setLayout(mainLayout);
  25. }
  26.  
  27. void MainWidget::clickedButtonUpdate(void)
  28. {
  29.     emit changedRecord(CurrentRecord);
  30.  
  31.     emit clickedUpdate();
  32.     //dlgUpdate->show();
  33. }
  34.  
  35. void MainWidget::connectData(void)
  36. {
  37.     //QString tmpQuery = "SELECT ID, Firstname, Surname, BirthDay  FROM Student";
  38.  
  39.     DataSourceConnected = true;
  40.     //emit executeQuery(tmpQuery);
  41.     changeData();
  42.     qDebug() << "Emitted signal executeQuery";
  43. }
  44.  
  45. void MainWidget::processQuery(QSqlQueryModel *parModel)
  46. {
  47.     CurrentQueryModel = parModel;
  48.     if(CurrentQueryModel == 0) {
  49.         qDebug() << "CurrentQueryModel == 0";
  50.     } else {
  51.         qDebug() << "CurrentQueryModel != 0";
  52.         tbvStudentList->setModel(CurrentQueryModel);
  53.         CurrentRecord = CurrentQueryModel->record(0);
  54.         emit changedRecord(CurrentRecord);
  55.     }
  56. }
  57.  
  58. void MainWidget::changeData(void)
  59. {
  60.     QString tmpQuery = "SELECT ID, Firstname, Surname, Birthday FROM Student";
  61.  
  62.     emit executeQuery(tmpQuery);
  63. }
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