Deleting row from QTableWidget and from Sqlite database

[JonB]

@Risver
@Christian-Ehrlicher's comment above is why your line querymodel->removeRow(addressId, 1); is generating an error. Look at the two different methods he has given you links to.

[JonB]

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

Thank You Christian, now i have no errors, but it is not removing.

Start by showing us your new line, because we don't know which of the two methods you changed to using and what parameters you gave it.

[Risver]

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

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

Thank You Christian, now i have no errors, but it is not removing.

Start by showing us your new line, because we don't know which of the two methods you changed to using and what parameters you gave it.

i've changed only this one:

void MainWindow::on_remove_clicked()
{
    if (ui->tableView->selectionModel()->hasSelection())
    {
        int addressId = ui->tableView->selectionModel()->currentIndex().row();
        querymodel->removeRows(addressId, 1);
    }
}

[JonB]

@Risver

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

[Risver]

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

@Risver

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

The rowCount is always 3 and the removeRows is false.

[Christian Ehrlicher]

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

[Risver]

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

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

Yes, it has.

[JonB]

@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?

[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