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Qt programming and Exception trouble.

mrdebug

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Wednesday, September 8th 2010, 8:34pm

Qt programming and Exception trouble.

I'm a beginner with Qt. I don't understand why the Exceptions are non used in Qt like in Delphi.
In a tipical function (like insert or update something in a database), in order to verify that all query have been executed correctly I must verify every single query like this:

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        if (!query.exec("select max(id_device) as id_max from Devices")) {
            Error= query.lastError().text();
            return false;
        } else {
        ...


In this case I have insert an error that does not has generated any visible error. In Delphi on in Freepascal this error (id_AAAAAAAAAdevice does not exist) produce an Exception.

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                        }
                        query.prepare("insert into Devices (id_device, Socket, Description, Address, UserID, Password, Authentication, DeviceType, InputsNumber) values " \
                                   "(:id_device, :Socket, :Description, :Address, :UserID, :Password, :Authentication, :DeviceType, :InputsNumber);");
                    } else {
                        query.prepare("update Devices set Socket= :Socket, Description= :Description, Address= :Address, UserID= :UserID, Password= :Password, " \
                                   "Authentication= :Authentication, DeviceType= :DeviceType, InputsNumber= :InputsNumber where id_device= :id_device;");
                    }
                    query.bindValue(":id_AAAAAAAAAdevice", QVDevices[count].id_device); <------------------------
                    query.bindValue(":Socket", QVDevices[count].id_device);
                    ...


Which is your mode to verify that all has works correctly?