Comments on: MetadataWorkspace in Entity Framework

By: Claude

Claude — Wed, 23 Mar 2011 14:51:18 +0000

Thanks a lot for this very nice blog. It helped a lot.
Metadata access is not that easy.
When you want to find the PrimaryColumns of the ConceptualModel:
///
/// Returns the name of the primary key property of the entity.
///
/// If there is no primary property, it returns null.
/// If there is more than one primary key property, it returns null.
///
///
/// The type of the entity
/// The name of the primary-Key property
public static string GetPrimaryKeyProperty()
{
var items = Worksapce.GetItems(DataSpace.CSpace);
var itemX = items.Where(x => x.Name == typeof(T).Name).Single();
if (itemX.KeyMembers.Count != 1)
{
return null;
}
return itemX.KeyMembers.Single().Name;
}

If you want to learn the entity framework, see: http://www.testmaster.ch/EntityFramework.test

By: cincura.net

cincura.net — Mon, 14 Sep 2009 19:54:18 +0000

Well this isn’t so easy. You have to realize, that the model you see is conceptual model and there’s no 1:1 mapping to the shape of store (database). I.e. you can have a Car entity that’s composed from two tables, i.e. Vehicle and Car (aka inheritance).

I’m not sure what this is good for. But yes, you should be able to get this information from MetadataWorkspace, and definitely from MSL file.

By: Alex Y

Alex Y — Mon, 14 Sep 2009 19:01:15 +0000

Thanks for nice blog.

Let me know please if you know a way to retrieve the table name from the Entity.
For example I may have Entity named SupperCar but the actual table name it is mapped is Car.
Do I need to use MetadataWorkspace and CS-Space? I heard that it is not supported yet.