Hello!
I have problem with QTableView and QStandardItemModel
My header file:

Qt Code: 
  1. #ifndef TABLEVIEW_H
  2. #define TABLEVIEW_H
  3.  
  4. #include <QtGui>
  5. #include <QWidget>
  6. #include <QTableView>
  7. #include <QStandardItemModel>
  8. #include <QStandardItem>
  9. #include <QString>
  10. #include <QVector>
  11. #include <QtSql/QSqlDatabase>
  12. #include <QtSql/QSqlError>
  13. #include <QtSql/QSqlQuery>
  14. #include <QtSql/QSQLiteDriver>
  15. #include <QMessageBox>
  16. #include <QDialog>
  17. #include "dialog.h"
  18.  
  19. class tableView : public QWidget
  20. {
  21.     Q_OBJECT
  22. public:
  23.     tableView(QWidget *parent = 0);
  24.     void db_add(QString atr1, QString atr2);
  26.  
  27. private:
  28.     QString sstr;
  29.     QTableView *tblv;
  30.     QLabel *label1, *label2;
  31.     QLineEdit *lineeRow, *lineeCol;
  32.     QPushButton *btnApply;
  33.     int nrow, ncol;
  34.     QVector<QString> table;
  35.     int db_connect();
  36.     void btnApply_clicked();
  37.     QString asda;
  39.     int a;
  41. private slots:
  42.     void dial();
  43. };
  44.  
  45. #endif // TABLEVIEW_H
To copy to clipboard, switch view to plain text mode 

source file:

Qt Code: 
  1. #include "tableview.h"
  2. #include <QDebug>
  3.  
  4. tableView::tableView(QWidget *parent)
  5.     : QWidget(parent)
  6. {
  7.  
  8.     //create layout
  9.     QVBoxLayout *mainLayout = new QVBoxLayout();
  10.     QHBoxLayout *horLayout1 = new QHBoxLayout;
  11.     QHBoxLayout *horLayout2 = new QHBoxLayout;
  12.  
  13.     btnApply = new QPushButton(tr("Apply"));
  14.  
  15.  
  16.     //create QTableView
  17.     tblv = new QTableView();
  18.     tblv->setSelectionBehavior(QAbstractItemView::SelectItems );
  19.     tblv->setSelectionMode( QAbstractItemView::ExtendedSelection );
  20.     //setting layout
  21.     mainLayout->addLayout(horLayout1);
  22.     mainLayout->addLayout(horLayout2);
  23.     mainLayout->addWidget(btnApply);
  24.     mainLayout->addWidget(tblv);
  25.     setLayout(mainLayout);
  26.     connect(btnApply, SIGNAL(clicked()), this, SLOT(dial()));
  27.     btnApply_clicked();
  28.  
  29. }
  30. void tableView::dial()
  31. {
  32.     Dialog dial;
  33.     dial.show();
  34.     dial.exec();
  35. }
  36.  
  37. int tableView::db_connect()
  38. {
  39.     if(!db.isOpen())
  40.     {
  41.         db = QSqlDatabase::addDatabase("QSQLITE");
  42.         db.setDatabaseName("./baza.db");
  43.         if (!db.open())
  44.         {
  45.             QMessageBox::critical(0, qApp->tr("Nie udało się nawiązać połączenia z bazą danych!"),
  46.                                               qApp->tr("Naciśnij Cancel aby zakończyć."), QMessageBox::Cancel);
  47.         }
  48.         return 1;
  49.     }
  50.     return 0;
  51. }
  52.  
  53. void tableView::db_add(QString atr1, QString atr2)
  54. {
  55.     QSqlQuery query;
  56.     QString asda;
  57.     asda = QString("insert into person values(null, '");
  58.     asda += atr1;
  59.     asda += "', '";
  60.     asda += atr2;
  61.     asda += "')";
  62.     qDebug() << asda;
  63.     query.exec(asda);
  64.     if(query.lastError().isValid())
  65.         qDebug() << query.lastError();
  66.     qDebug() << "1";
  67.     item = new QStandardItem(query.lastInsertId().toString());
  68.     qDebug() << "2";
  69.     model->setItem(a, 0, item);
  70.     qDebug() << "3";
  71.     item = new QStandardItem(atr1);
  72.     qDebug() << "4";
  73.     model->setItem(a, 1, item);
  74.     qDebug() << "5";
  75.     item = new QStandardItem(atr2);
  76.     qDebug() << "6";
  77.     model->setItem(a, 2, item);
  78. }
  79.  
  80. void tableView::btnApply_clicked()
  81. {
  82.     if(db_connect()==1)
  83.     {
  84.         //get number of input row and column
  85.         nrow = 2;
  86.         ncol = 3;
  87.  
  88.         //create model
  89.         model = new QStandardItemModel( nrow, ncol, this );
  90.  
  91.        //create QTableview Horizontal Header
  92.        // model->setHorizontalHeaderItem( r, new QStandardItem( QString("Column_ %0" ).arg(r+1)) );
  93.     model->setHorizontalHeaderItem(0, new QStandardItem(QString("Lp.")));
  94.     model->setHorizontalHeaderItem(1, new QStandardItem(QString("Nazwa")));
  95.     model->setHorizontalHeaderItem(2, new QStandardItem(QString("Haslo")));
  96.     QSqlQuery query;
  97.  
  98.     a = 0;
  99.     query.exec("SELECT * from person");
  100.     while(query.next())
  101.     {
  102.         for(int x=0; x<3; x++)
  103.         {
  104.             sstr = query.value(x).toString();
  105.  
  106.             item = new QStandardItem(sstr);
  107.             model->setItem(a, x, item);
  108.         }
  109.         a++;
  110.     }
  111.     //set model
  112.     tblv->setModel(model);
  113.  
  114.     tblv->resizeRowsToContents();
  115.     tblv->setFixedSize(800,600);
  116.     tblv->setColumnWidth(2,350);
  117.     tblv->setColumnWidth(1,350);
  118.     tblv->setColumnWidth(0,50);
  119.     tblv->scrollToBottom();
  120.     }
  121. }
To copy to clipboard, switch view to plain text mode 

in btnApply_Clicked() I am generating a table on base sqlite data.
in Dialog window I am giving arguments and calling up db_add function, then the arguments get into sqlite database and then I want to add this arguments to next rows in the QTableView, but when I run the program I get error of memory, and information in qt creator "exited with code -1073741819" when it get to item = new QStandardItem(query.lastInsertId().toString()). I tried give other argument (item = new QStandardItem(QString("test")) but it didn't help.
I would be grateful for your help, and sory for my bad english.
Janusz