QTableView output save as .csv or .txt

Question

I wrote the below code for a qt gui to view the query output in a QTableView(Model oriented). now i want to save this output as a .csv or .txt file. There were suggestions to use QTableWidget(Item oriented) but I would like to stick to the model based approach.

void MainWindow::on_pushButton_clicked()
{
db = QSqlDatabase::addDatabase("QOCI");
db.setHostName("host");
db.setDatabaseName("db");
db.setUserName("uid");
db.setPassword("pw");
db.setPort(port);

QString MyQuery = ui->lineEdit->text();

if (db.open())
{
    qDebug()<<QDateTime::currentDateTime()<<"QUERY DONE SUCCESSFULLY ";

    this->model=new QSqlQueryModel();
    model->setQuery(MyQuery);
    ui->tableView->setModel(model);

}
else
{
    qDebug()<<QDateTime::currentDateTime()<<"YOU FORGOT THE QUERY "<<db.lastError().text();
}

}

any guidelines ???

Answer 1

You may customize it according to your actual needs:

// [Collect model data to QString]
QString textData;
int rows = model->rowCount();
int columns = model->columnCount();

for (int i = 0; i < rows; i++) {
    for (int j = 0; j < columns; j++) {

            textData += model->data(model->index(i,j)).toString();
            textData += ", "      // for .csv file format
    }
    textData += "\n";             // (optional: for new line segmentation)
}

// [Save to file] (header file <QFile> needed)
// .csv
QFile csvFile("test.csv");    
if(csvFile.open(QIODevice::WriteOnly | QIODevice::Truncate)) {

    QTextStream out(&csvFile);
    out << textData;

    csvFile.close();
} 

// .txt
QFile txtFile("test.txt");    
if(txtFile.open(QIODevice::WriteOnly | QIODevice::Truncate)) {

    QTextStream out(&txtFile);
    out << textData;

    txtFile.close();
} 

Answer 2

You can save your model to a text file by :

QFile f( "table.txt" );
if( f.open( QIODevice::WriteOnly ) )
{
    QTextStream ts( &f );
    QStringList strList;
    for (int i=0; i<model->rowCount(); i++)
    {
        strList.clear();

        for (int j=0; j<model->columnCount(); j++)
            strList << model->data(model->index(i,j)).toString();

        ts << strList.join(" ") + "\n";
    }
    f.close();
}

Here the model data are saved one row in each line separated by space. If you want to separate them by some other character like comma you can just replace the parameter on the join like :

ts << strList.join(",") + "\n";

Answer 3

here is a way to export a qtableview to a csv, including the column names using qt

   void staticmethods::exportTableViewToCSV(QTableView *table) {
            QString filters("CSV files (*.csv);;All files (*.*)");
            QString defaultFilter("CSV files (*.csv)");
            QString fileName = QFileDialog::getSaveFileName(0, "Save file", QCoreApplication::applicationDirPath(),
                               filters, &defaultFilter);
            QFile file(fileName);

            QAbstractItemModel *model =  table->model();
            if (file.open(QFile::WriteOnly | QFile::Truncate)) {
                QTextStream data(&file);
                QStringList strList;
                for (int i = 0; i < model->columnCount(); i++) {
                    if (model->headerData(i, Qt::Horizontal, Qt::DisplayRole).toString().length() > 0)
                        strList.append("\"" + model->headerData(i, Qt::Horizontal, Qt::DisplayRole).toString() + "\"");
                    else
                        strList.append("");
                }
                data << strList.join(";") << "\n";
                for (int i = 0; i < model->rowCount(); i++) {
                    strList.clear();
                    for (int j = 0; j < model->columnCount(); j++) {

                        if (model->data(model->index(i, j)).toString().length() > 0)
                            strList.append("\"" + model->data(model->index(i, j)).toString() + "\"");
                        else
                            strList.append("");
                    }
                    data << strList.join(";") + "\n";
                }
                file.close();
            }

        }