[SOLVED] QSqlTableModel refuses to write data in database

[soroush]

I do write a a couple of applications similar to this one. All of them work, but this doesn't work properly! The problem is that QSqlTableModel can't change content of table in database. When I select a row and edit a cell, then apply query again, anything is not changed.
This is connection method:
@
if(Database::instance.open())
{
model = new QSqlTableModel (this,Database::instance);
model->setTable("myTable");
tableView->setModel(model);
mapper = new QDataWidgetMapper(this);
//...
}
@

[lgeyer]

What is your editStrategy?
Did you submitAll() when using QSqlTableModel::OnManualSubmit?
What does lastError() return?

[soroush]

Edit strategy is OnRowChange.

Returned error is :
@
Using unsupported buffer type: 86026 (parameter: 1) QMYSQL3: Unable to bind value
@

I'm using MySQL version 5.5.23

[soroush]

I replaced libmysql.dll which I compiled QMYSQL driver against it, with the newer version that I just installed on client's machine. Works fine.

Thanks for your response.

Note: programming for Windows using Qt makes me mad :-/