How to save the image in mysql database in QT?

originalPixmap =QPixmap();
           originalPixmap = QPixmap::grabWindow(QApplication::desktop()->winId());
           QString strfname;
           strfname.sprintf("%d",c);
           originalPixmap.save("D:\\image"+strfname+".jpeg","jpeg");
           c++;
           char Data;
           QFile file("D:\\image"+strfname+".jpeg");
           file.open(QIODevice::ReadOnly);
           file.seek(0);
           int len=file.size();
           QByteArray buf;
           buf=file.read(len);
           QSqlQuery query;
           query.prepare("INSERT INTO log (id,grab_date, ip_address, image,logged_user) "
                         "VALUES (:id, :grab_date, :ip_address, :image,  :logged_user)");
           query.bindValue(":id",400);
           query.bindValue(":grab_date",(QVariant)'2011-04-26 15:55:09');
           query.bindValue(":ip_address",(QVariant)'172.16.0.51');
           query.bindValue(":image",(QVariant)buf.data());
           query.bindValue ( ":logged_user",(QVariant) hostname);
           bool qry=query.exec();