SQL Parameter count mismatch on QTableView - c++

Question

I have a GUI composed of:
N.1 GraphicsView
N.1 QTableView
N.1 dialog that opens up as needed by the user after doubleclicking on each row of the QTableView
I can capture features on the QGraphicsView with the mouse click. After the feature is drawn I right click and open up a dialog like the one in the figure:
After hitting accept: I register the feature as the row index of the QTableView as shown below:
If I doubleclick on each row I am able to open again the same dialog with the information previously saved. I do that because I may need to change the name of the image and call it differently.
The problem I currently have is that I ma receiving a weird Parameter count mismatch from the compiler and I don't understand why and it should be due to QSQLITE
Below is what I am trying to do along with the most important part of the code:
parameters.h
typedef struct Param
{
int mId;
QString mName;
QByteArray mSave;
} Param;
class Parameters
{
public:
Parameters() = default;
Parameters(Param newdata);
Parameters(int id, const QString &name, const QByteArray &save);
int id() const { return data.mId; }
QString name() const {return data.mName; }
QByteArray save() const {return data.mSave; }
Param getData() const { return data; }
void setData(Param ndat) { data = ndat; }
private:
Param data;
};
parameters.cpp
#include "parameters.h"
Parameters::Parameters(Param newdata) {
data = newdata;
}
Parameters::Parameters(int id, const QString &name,
const QByteArray &save) {
data.mId = id;
data.mSave = save;
data.mName = name;
}
the database is set in the following dataleftcamera.h part:
public:
explicit dataLeftCamera(QObject *parent = nullptr);
bool addItem(Parameters* mParameters);
bool updateItem(int itemId, Parameters* mParameters);
QSqlDatabase getDatabase();
private:
QString mError;
QSqlDatabase mDatabaseLeft;
The table is initiated here on dataleftcamera.cpp and here is where the compiler is giving the Parameter count mismatch error specifically on the function updateItem
#define CREATE_TABLE \
" CREATE TABLE IF NOT EXISTS leftCamTable" \
" (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL" \
", name TEXT NOT NULL" \
", save BLOB NOT NULL)"
dataLeftCamera::dataLeftCamera(QObject *parent) : QObject (parent)
{}
bool dataLeftCamera::addItem(Parameters *mParameters)
{
QSqlQuery qry;
qry.prepare("INSERT INTO leftCamTable (name, save)"\
" VALUES (?,?)");
qry.addBindValue(mParameters->name());
qry.addBindValue(mParameters->save());
bool ok = qry.exec();
if(!ok) {
mError = qry.lastError().text();
qDebug() << mError;
}
}
bool dataLeftCamera::updateItem(int itemId, Parameters *mParameters)
{
QSqlQuery qry;
qry.prepare(" UPDATE lefCamTable SET " \
" name = ?," \
" save = ?" \
" WHERE id = ?");
qry.addBindValue(mParameters->name());
qry.addBindValue(mParameters->save());
qry.addBindValue(itemId);
bool ok = qry.exec();
if(!ok) {
mError = qry.lastError().text();
qDebug() << mError;
}
}
On the mainwindow.cpp is the part where I update the item after I doubleclick on the row to change the name of the image and accept again the modification:
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
mDatabaseLeftCamera = new dataLeftCamera(this);
mModelLeftCamera = nullptr;
mModelLeftCamera = new QSqlTableModel(this);
ui->tableView->setModel(mModelLeftCamera);
connect(ui->tableView, SIGNAL(doubleClicked(QModelIndex)),
this, SLOT(onTableClick(QModelIndex)));
// temporary folder
temporaryFolder = "/home/name/Desktop/tempDBFolder/tmp.db";
QFile dbRem(temporaryFolder);
dbRem.remove();
mDatabaseLeftCamera->inizializationDatabaseLeftCamera(temporaryFolder);
mDatabaseLeftCamera->configurationDatabaseLeftCamera();
mModelLeftCamera = new QSqlTableModel(this, mDatabaseLeftCamera->getDatabase());
mModelLeftCamera->setTable("leftCamTable");
mModelLeftCamera->select();
ui->tableView->setModel(mModelLeftCamera);
ui->tableView->showColumn(true);
}
// opening the dialog for the first time after capturing the image
void MainWindow::contextMenuEvent(QContextMenuEvent *event)
{
// operations
Param result = d.getData();
Parameters* param = new Parameters(result);
mDatabaseLeftCamera->addItem(param);
mModelLeftCamera->select();
ui->tableView->show();
}
// This is the doubleclick that re-opens the small dialog to change the name of the feature
void MainWindow::onTableClick(const QModelIndex &index)
{
int row = index.row();
Param currentData;
int ItemId = index.sibling(row, 0).data().toInt();
currentData.mName = index.sibling(row, 1).data().toString();
currentData.mSave = index.sibling(row, 2).data().toByteArray();
QPixmap iconPix;
if(!iconPix.loadFromData(index.sibling(row, 2).data().toByteArray())) {
}
clipSceneDialog d(this);
d.show();
d.setData(currentData);
d.setImage(iconPix.toImage());
if(d.exec() == QDialog::Rejected) {
return;
} else {
//
}
Param result = d.getData();
Parameters* param = new Parameters(result);
mDatabaseLeftCamera->updateItem(ItemId,param);
mModelLeftCamera->select();
ui->tableView->show();
}
For completeness see the error the compiler is giving if that helps:
I am sorry if this is trivial but I checked the updateItem(ItemId,param)
and thanks for shedding light on this.

Answer 1

Try and add some debug printing. Especially for the parameters that you add to the prepared statement. qry.addBindValue converts your value to a QVariant. Based on the documentation QVariants become NULL when they contain no data:
QVariant x(QString());
// x.isNull() == true
In case there is a problem retrieving your parameters, this could explain the violation of the NOT NULL constraints.