Appcrash after sql statement with QString

[A Former User]

Hello,

If i execute this sql-statement my app crashes if I change a ComboBox item

@
void MainWindow::on_comboBox_currentIndexChanged(const QString &arg1)
{

if(!db.isOpen())
{
    qDebug() << "DB is not open!";
}

QSqlQuery q;
q.exec&#40;"SELECT * FROM autos WHERE snr = '"+ arg1 +"'"&#41;;


}

@

If i use this it works...

@
void MainWindow::on_comboBox_currentIndexChanged(const QString &arg1)
{

if(!db.isOpen())
{
    qDebug() << "DB is not open!";
}

QSqlQuery q;
q.exec&#40;"SELECT * FROM autos WHERE snr = '0588/835'"&#41;;


}

@

why....???? :/

[clochydd]

Hi,

what's the content of arg1?
@
qDebug() << arg1;
@

[A Former User]

@
"0588/835"
@

[clochydd]

Try to bind the value for snr:
@
QSqlQuery q;
q.prepare("SELECT * FROM autos WHERE snr = :sachnr");
q.bindValue(":sachnr", arg1);
if (!q.exec()) {
qDebug() << q.lastError().text()
return;
} else {
//...
}
@

[A Former User]

I don´t know why, but now both solutions are working...

thanks anyway