private static void PrepareDeepObjGraph()
{
using (IObjectContainer container = Db4oEmbedded.OpenFile(DatabaseFile))
{
Person jodie = new Person("Jodie");
jodie.Add(new Person("Joanna"));
jodie.Add(new Person("Julia"));
container.Store(jodie);
container.Store(new Car(new Person("Janette"), "Mercedes"));
}
}
private static void UpdateDepthForCollection()
{
// #example: A higher update depth fixes the issue
IEmbeddedConfiguration config = Db4oEmbedded.NewConfiguration();
config.Common.UpdateDepth = 2;
using (IObjectContainer container = Db4oEmbedded.OpenFile(DatabaseFile))
{
// #end example
Person jodie = QueryForJodie(container);
jodie.Add(new Person("Jamie"));
container.Store(jodie);
}
config = Db4oEmbedded.NewConfiguration();
config.Common.UpdateDepth = 2;
using (IObjectContainer container = Db4oEmbedded.OpenFile(DatabaseFile))
{
Person jodie = QueryForJodie(container);
foreach (Person person in jodie.Friends)
{
// the added friend is gone, because the update-depth is to low
Console.WriteLine("Friend=" + person.Name);
}
}
}
private static void ToLowUpdateDepthOnCollection()
{
// #example: Update doesn't work on collection
using (IObjectContainer container = Db4oEmbedded.OpenFile(DatabaseFile))
{
Person jodie = QueryForJodie(container);
jodie.Add(new Person("Jamie"));
// Remember that a collection is also a regular object
// so with the default-update depth of one, only the changes
// on the person-object are stored, but not the changes on
// the friend-list.
container.Store(jodie);
}
using (IObjectContainer container = Db4oEmbedded.OpenFile(DatabaseFile))
{
Person jodie = QueryForJodie(container);
foreach (Person person in jodie.Friends)
{
// the added friend is gone, because the update-depth is to low
Console.WriteLine("Friend=" + person.Name);
}
}
// #end example
}
private static void PrepareDeepObjGraph()
{
using (IObjectContainer container = Db4oEmbedded.OpenFile(DatabaseFile))
{
Person jodie = new Person("Jodie");
jodie.Add(new Person("Joanna"));
jodie.Add(new Person("Julia"));
container.Store(jodie);
container.Store(new Car(new Person("Janette"), "Mercedes"));
}
}
