如何在实体框架中处理此层次结构

Question

I have a particular sort of data model that has to use a closure table due to the fact that nearly every material_composite is the root of its own tree, but can also be in the hierarchy of any other material_composite's tree:

I'm working with SQL Server, Entity Framework 5 and WPF and there are two primary use cases here:

1) Browse the entire tree

2) Browse/modify a single material_composite's tree.

I can return the entire tree using SQL Server's FOR XML, but then I'm doing a lot of back and forth with the db whenever I want to look at the details/relations for a particular node in the hierarchy. I'd much rather be working with actual properties in POCO entities.

Does anyone have any concrete suggestions for how to get an arbitrarily deep hierarchy from a closure table into an application using Entity Framework?

Answer 1

I oracle, I'd probably use some kind of connect by prior query to get the information you need. I think you can now do something similar in sqlserver with CTEs

http://technet.microsoft.com/en-us/library/ms186243(v=sql.105).aspx