QString to double without exponential

[binio]

I want to write "8989898.89" from a lineedit to my database. I use the code:

double databasevar=0;
databasevar = ui->lineEdit_input->text().toDouble();
...
sql insert ...
...

double databasevar=0;
databasevar = ui->lineEdit_input->text().toDouble();
...
sql insert ...
...

To copy to clipboard, switch view to plain text mode 

after the insert i have in my database the value "8989900.00" -> "8.9899e+06".
how do i deactivate the exponential translation that kills the last digits.

Can someone help me pls