Sterling database not persist on Windows phone - windows-phone-7

Question

I followed sterling database examples from several persons. Neither of them seems to work out for me. When I persist some stuff on my database everything clearly gets persisted using sterling (on my phone, not emulator) when debugging. However when I relaunch my app the database is empty. Is somebody else experiencing the same problem. Or does someone have a complete working example. I know my serializing and saving works... As long as I don't relaunch my app loading my state works...
Code in my app.cs
public static ISterlingDatabaseInstance Database { get; private set; }
private static SterlingEngine _engine;
private static SterlingDefaultLogger _logger;
private void Application_Launching(object sender, LaunchingEventArgs e)
{
ActivateEngine();
}
// Code to execute when the application is activated (brought to foreground)
// This code will not execute when the application is first launched
private void Application_Activated(object sender, ActivatedEventArgs e)
{
ActivateEngine();
}
// Code to execute when the application is deactivated (sent to background)
// This code will not execute when the application is closing
private void Application_Deactivated(object sender, DeactivatedEventArgs e)
{
DeactivateEngine();
}
// Code to execute when the application is closing (eg, user hit Back)
// This code will not execute when the application is deactivated
private void Application_Closing(object sender, ClosingEventArgs e)
{
DeactivateEngine();
}
private void ActivateEngine()
{
_engine = new SterlingEngine();
_logger = new SterlingDefaultLogger(SterlingLogLevel.Information);
_engine.Activate();
Database = _engine.SterlingDatabase.RegisterDatabase<SokobanDb>();
}
private void DeactivateEngine()
{
_logger.Detach();
_engine.Dispose();
Database = null;
_engine = null;
}
Code in my viewModel
public void LoadState(int level)
{
var levelState = App.Database.Load<LevelState>(level);
if (levelState != null)
{
//TODO: check if game started, then create board from boardstring property else create new board
//Labyrint = new Labyrint(Factory.CreateBoard());
NewGame(level);
}
else
{
NewGame(level);
}
}
public void SaveState()
{
var levelState = new LevelState { LevelId = _level, Moves = Labyrint.Moves, Board = Labyrint.ToString() };
App.Database.Save(levelState);
App.Database.Flush(); //Required to clean indexes etc.
}

Answer 1

The default Sterling database uses an in-memory driver. To persist, pass it an isolated storage driver. Per the documentation guide quickstart:
https://sites.google.com/site/sterlingdatabase/sterling-user-guide/getting-started
The code looks like this:
_databaseInstance = _engine.SterlingDatabase.RegisterDatabase(new IsolatedStorageDriver());
Note the instance of the isolated storage driver being passed in. That should do it for you.
When in doubt, take a look at the unit tests shipped with the source. Those contain tons of examples of memory, isolated storage, etc. to show various patterns for setting it up.