Hi all
This morning on the train on the way to work I tried the following to
change the location of the offlineStorage DB:
The c++ main function of the demo app CreateDBQt5 now looks like this:
int main(int argc, char *argv[])
{
QScopedPointer<QGuiApplication> app(SailfishApp::application(argc, argv));
QScopedPointer<QQuickView> view(SailfishApp::createView());
qDebug() << "offlineStoragPath orig: " <<
view->engine()->offlineStoragePath();
view->engine()->setOfflineStoragePath(QString("/home/nemo/.local/share/landed25_QT5/QML/OfflineStorage"
));
qDebug() << "offlineStoragPath new: " <<
view->engine()->offlineStoragePath();
view->setSource(SailfishApp::pathTo("qml/CreateDBQt5.qml"));
view->show();
view->showFullScreen();
return app->exec();
}
This gives the following Application Output:
[D] main:42 - offlineStoragPath orig:
"/home/nemo/.local/share/CreateDBQt5/QML/OfflineStorage"
[D] main:44 - offlineStoragPath new:
"/home/nemo/.local/share/landed25_QT5/QML/OfflineStorage"
The database is indeed created in
/home/nemo/.local/share/landed25_QT5/QML/OfflineStorage", and is
accessible to the app landed25_QT5
Note the order of the view->engine()->setOfflineStoragePath... and
view->setSource... calls is crucial. If the setSource comes first,
then the QML is initiated before the storagePath is changed!
In my next experiment I will try to change the storageLocation to
something like QStandardPaths::GenericDataLocation.
The question on harbour acceptability remains ...
Chris
----- Weitergeleitete Nachricht von christopher.l...@thurweb.ch -----
Datum: Wed, 15 Jan 2014 22:34:40 +0100
Von: christopher.l...@thurweb.ch
Antwort an: "Sailfish OS Developers" <devel@lists.sailfishos.org>
Betreff: [SailfishDevel] Sharing a common OfflineStorage DB
between multiple Sailfish apps.
An: "Sailfish OS Developers" <devel@lists.sailfishos.org>
Hi all
Is it possible to steer where a QML application stores its
OfflineStorage Database?
I have a family of applications that share a common OfflineStorage
Database. This works well on Harmattan, and on the early Sailfish
Alphas without me having had to do anything special at all.
In the early Sailfish Alphas OfflineStorage DBs were stored in a
common location, and thus could be easily shared.
/home/nemo/.local/share/data/QML/OfflineStorage/Databases
Now on the real Jolla, I find that the standard DB storage location
has changed, and DBs are now put in a subdirectory of the
application's installation folder. e.g.
/home/nemo/.local/share/landed25_QT5/QML/OfflineStorage
/home/nemo/.local/share/CreateDBQt5/QML/OfflineStorage
This means without some magic, Sailfish apps can no longer share DBs.
In C++ there is a property offlineStoragePath, and a setter method
setOfflineStoragePath().
http://qt-project.org/doc/qt-5/qqmlengine.html#offlineStoragePath-prop
I might be able to use this to change the location of the DB, e.g to
one of the Qt StandardLocations:
http://qt-project.org/doc/qt-5.0/qtcore/qstandardpaths.html#StandardLocation-enum
But setOfflineStoragePath() appears not to be directly available to QML.
http://stackoverflow.com/questions/14209585/how-to-set-custom-offline-storage-path-from-javascript-in-qtquick
So I guess I could call setOfflineStoragePath in each apps' main cpp file.
Or maybe I could even write a declarative plugin to expose
setOfflineStoragepath to QML, but that is probably overkill as it
would instantiate QQmlEngine - just t o set a path.
Or is there a better way? Are there any Harbour entry considerations
to an app creating / accessing a DB somewhere other than in its own
folder?
Thanks
Chris
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