ExtObjectContainer#descend method allows you to navigate from a persistent object to it's members without activating or instantiating intermediate objects.
01Public Shared Sub TestDescend() 02
StoreSensorPanel() 03
Dim configuration As IConfiguration = Db4oFactory.NewConfiguration() 04
configuration.ActivationDepth(1) 05
Dim db As IObjectContainer = Db4oFactory.OpenFile(configuration, Db4oFileName) 06
Try 07
System.Console.WriteLine("Object container activation depth = 1") 08
Dim result As IObjectSet = db.Get(New SensorPanel(1)) 09
Dim spParent As SensorPanel = CType(result(0), SensorPanel) 10
Dim fields() As String = {"_next", "_next", "_next", "_next", "_next"} 11
Dim spDescend As SensorPanel = CType(db.Ext().Descend(CType(spParent, Object), fields), Object) 12
db.Ext().Activate(spDescend, 5) 13
System.Console.WriteLine(spDescend) 14
Finally 15
db.Close() 16
End Try 17
End Sub
Navigating in this way can save you resources on activating only the objects you really need.