How to use a pre-populated sqlite database with qwebview?

Is there a way to use a pre-populated sqlite database with a qwebview? I have a javascript application that makes use of that database.

I've enabled offline storage,

QWebSettings::globalSettings()->setAttribute(QWebSettings::OfflineStorageDatabaseEnabled, true);

set a confortable size to it

QWebSettings::setOfflineStorageDefaultQuota(20*1024*1024);

and set location:

QWebSettings::globalSettings()->setOfflineStoragePath(QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation)+"/data/myapp");

Copying the database file from qrc resource file to that location doesn't do the trick;

QFile::copy(":/mydatabase.db" , QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation)+"/data/myapp/mydatabase.db");

how to proceed?

Thank you.