Why is the UPDATE query (QT SQLITE) not running?

Question

Qt

I work with sqlite from qt. Requests for adding and selecting work fine, they do not work for updating and deleting, or rather, the exec () function returns true, but I do not observe the result of the request in the database.

QString query = "UPDATE `mic` SET name='?', micType='?', accuracy='?', "
                        "perform='?', power='?', price='?', bodyType='?', ifType='?', "
                        "outType='?', bit='?', vendor='?', integType='?', fD='?', "
                        "channelCount='?', modul='?', cascadeCount='?', "
                        "quantizerLevel='?', filter='?', year='?', about='?' "
                        "WHERE id='?'";
// код
this->query.prepare(query);
// код
this->query.addBindValue(item->text());

Perhaps the problem is in the quotes surrounding the parameters ('?'), but without them " Parameter count mismatch". In an append request, the situation is reversed.
Advise something, otherwise the skis do not go. Thanks in advance.

Answer 1

Quotes are not needed "perform='?'"
Should be "perform=?" (because addBindValue will add one more quotes for the texts, and they are not needed).
Count the number of characters? and query.addBindValue