QSqlTableModel rowCount doesn't change after row delete

morteasherah

I was developing a small qt quick app for clients management. I have encountered a problem that I have described here https://forum.qt.io/topic/67287/tableview-how-to-delete-a-row/2

Investigating the problem, I have discovered that it is a bug in QSqlTableModel. I implemented the following code and ran it

#include <QtSql/QSqlTableModel>
#include <QDebug>
#include <QtSql/QSqlDatabase>
#include <QMessageBox>
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QString dbName(app.applicationDirPath());
    dbName.append("/mydb.sqlite");

    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName(dbName);
    if (!db.open()) {
        QMessageBox::critical(0, qApp->tr("Impossibile aprire il database"), "", QMessageBox::Cancel);
        return 0;
    }

    QSqlTableModel dataModel;
    dataModel.setTable("Clienti");
    dataModel.setEditStrategy(QSqlTableModel::OnRowChange);
    dataModel.select();

    while(dataModel.canFetchMore())
        dataModel.fetchMore();

    qDebug() << dataModel.rowCount();
    dataModel.removeRow(3);
    qDebug() << dataModel.rowCount();

    db.close();
}

As you can see, it interfaces with the Sqlite db and tries to delete a row. The problem is that both qDebug statements give the same number for rowCount. So you remove a row, but the rowCount doesn't change. This confuses the TableView qml control that I am using in the other program and forces it to show empty rows at the end of the table.

manfred_exz

As the documents for QSqlTableModel::removeRows(not removeRow) says,

"Deletions are submitted immediately to the database. The model retains a blank row for successfully deleted row until refreshed with select()."

QSqlTableModel doesn't reimplement removeRow, but I think it works the same. So you should call select()