Deleting row from QTableWidget and from Sqlite database

Risver

@JonB said in Deleting row from QTableWidget and from Sqlite database:

@Christian-Ehrlicher said in Deleting row from QTableWidget and from Sqlite database:

Does your table has a primary key? Otherwise removing will not work.

That's very interesting. I assume we're talking about a SQL table model here? I looked through the docs (briefly) but did not see any mention of this requirement, is it documented?

That is how my SQL Table looks.

JonB

@Risver

qDebug() << querymodel->removeRows(addressId, 1);

Please add qDebug() << addressId, we need to make sure what that is, just in case.....

Risver

@JonB said in Deleting row from QTableWidget and from Sqlite database:

@Risver
qDebug() << querymodel->removeRows(addressId, 1);
Please add qDebug() << addressId, we need to make sure what that is, just in case.....

It is a variable to store the selected row, for example when i select the first row, it returns 0.
I checked this and its working fine

JonB

@Risver
OK, so independent of your selection querymodel->removeRows(0, 1); fails to remove the first row? We can then rule out anything to do with the UI or the selection.

Risver

@JonB
Exactly.

Risver

@JonB said in Deleting row from QTableWidget and from Sqlite database:

@Risver
OK, so independent of your selection querymodel->removeRows(0, 1); fails to remove the first row? We can then rule out anything to do with the UI or the selection.

Do you have something specific in mind ?

JonB

@Risver
Hang on. Does QSqlQueryModel allow any removing it all? It's a query, it won't/shouldn't do anything to the database for sure.

[Yep, I'm sure, QSqlQueryModel is a read only model, you can't remove rows from it.]

If you are wanting to alter the underlying the database table, I think you should be using QSqlTableModel instead?

I leave this to you, or @Christian-Ehrlicher, now, as I'm done for the week :)

Risver

@JonB said in Deleting row from QTableWidget and from Sqlite database:

@Risver
Hang on. Does QSqlQueryModel allow any removing it all? It's a query, it won't/shouldn't do anything to the database for sure.

[Yep, I'm sure, QSqlQueryModel is a read only model, you can't remove rows from it.]

If you are wanting to alter the underlying the database table, I think you should be using QSqlTableModel instead?

I leave this to you, or @Christian-Ehrlicher, now, as I'm done for the week :)

Okay, thank You, I will try to use QSqlTableModel.

Risver

I've changed the QSqlQueryModel into QSqlTableModel and everything is working !
Thank you all ! :)

~~I have one more question - how can i refresh the table at the current time ?~~

Done it !

Risver

I have one more question - can i get data from column and replace these with other data ?

SGaist

Hi,

Do you mean an entire column ?

Risver

@SGaist said in Deleting row from QTableWidget and from Sqlite database:

Hi,

Do you mean an entire column ?

Hi, yes i mean all the cells that are in the column

SGaist

Yes, select the whole column and then use a loop to parse the selection.

Risver

@SGaist
Okay and can i replace the old data with new data ?

JonB

@Risver
What "new data", from where? Do you mean something like over-pasting a selected column's data with other data in the QTreeView UI? Do you mean updating all rows to change one column's data in the model and/or the SQL database? Programatically or by user interaction? Or what?

Risver

@JonB said in Deleting row from QTableWidget and from Sqlite database:

@Risver
What "new data", from where? Do you mean something like over-pasting a selected column's data with other data in the QTreeView UI? Do you mean updating all rows to change one column's data in the model and/or the SQL database? Programatically or by user interaction? Or what?

I mean updating all rows to change one column's data in the model(not in SQL), I would like this to happen programatically.

The passwords in database are encrypted, I want them to be decrypted when I open the application.

JonB

@Risver
The you must loop over each row, updating the column:

for (int row = 0; row < querymodel->rowCount(); row++)
    querymodel->setData(querymodel->index(row, someColumnNumber), someValue);

Is that what you meant?

Risver

@JonB said in Deleting row from QTableWidget and from Sqlite database:

@Risver
The you must loop over each row, updating the column:
for (int row = 0; row < querymodel->rowCount(); row++)
    querymodel->setData(querymodel->index(row, someColumnNumber), someValue);
Is that what you meant?

Yes, thank you. But it is also changing the data in database.

JonB

@Risver
Of course. If you change a QSqlTableModel's data it will end up updating the database. That's the point of it.

You need to think out what you do and do not want to update, when and why.

Risver

@JonB
Now i'm using

ui->tableView->model()->setData(ui->tableView->model()->index(i, 3), passdecoded);

But it's only work for first row.

    for(int i = 0; i < table->rowCount(); i++)
    {
        QByteArray pass = ui->tableView->model()->data(ui->tableView->model()->index(i, 3)).toString().toUtf8();
        pass = QByteArray::fromBase64(pass);
        QString passdecoded = decoding(pass);
        qDebug() << passdecoded;
        ui->tableView->model()->setData(ui->tableView->model()->index(i, 3), passdecoded);
    }

Now i see its also changing the data in database...