Entity Framework FAQ

Frequently Asked Questions and Answers about ADO.Net Entity Framework

Guy Burstein [MVP] — Thu, 08 Nov 2007 14:50:21 GMT

Frequently Asked Questions and Answers about ADO.Net Entity Framework The ADO.Net Entity Framework team

First draft of an EF FAQ posted

Noticias externas — Thu, 08 Nov 2007 14:50:53 GMT

One of the PMs on the team, Asad Khan, sent me a list of questions and answers which he culled from looking

Entity Framework FAQ

Diego's Data Access Blog — Sat, 10 Nov 2007 03:11:42 GMT

One of the best learning resources I have found since I joined my team at Microsoft is this page Danny

Entity Framework FAQ

Noticias externas — Sat, 10 Nov 2007 03:46:53 GMT

One of the best learning resources I have found since I joined my team at Microsoft is this page Danny

EF FAQ updated - v0.3

system.data.objects dev guy — Fri, 04 Jan 2008 20:31:53 GMT

I've not spent near as much time on this as I would like, but this morning, I decided to do a quick update.

EF FAQ updated - v0.3

Noticias externas — Fri, 04 Jan 2008 21:07:22 GMT

I've not spent near as much time on this as I would like, but this morning, I decided to do a quick

Blog Links

Mike Taulty's Blog — Mon, 07 Jan 2008 16:19:28 GMT

Whilst digesting some blogs today I came across; Kaxaml - this is looking like a better and better "XAMLPad"...

Excellent post

markscottjohnson — Sun, 11 May 2008 09:20:02 GMT

Daniel,

Have been toying with the EF for a while now and this is the most succint and useful article I have seen on some of the more contentious and advanced scenarios - thx.

Am a big fan of nhibernate (and the POCO approach), can you recommned any good guidance/examples on implementing a codegen free approach you alude to in section 2.

re: Entity Framework FAQ

dsimmons@microsoft.com — Sun, 11 May 2008 09:33:30 GMT

Mark,

I’m glad you found it helpful. For more information about building classes from scratch, I recommend looking at the following link to part of the MSDN docs:

http://msdn.microsoft.com/en-us/library/bb738559.aspx

There’s some pretty good explanation there as well as a fair amount of sample code. If you have additional questions, don’t hesitate to ask.

- Danny

re: Entity Framework FAQ

rodrigo benin — Tue, 13 May 2008 18:44:18 GMT

Daniel,

Have been exploring the EF and a friend at Microsoft Brasil pointed me this blog. Nice work! It's a pretty good FAQ.

I still got one question: the lastest EF version shipped with de VS 2008 SP1 Beta still doesn't support entity inheritance? (such as Contact <- Person <- Customer for example) as posted in this FAQ at Question 7.2?

Thanks!

Rodrigo

re: Entity Framework FAQ

dsimmons@microsoft.com — Wed, 14 May 2008 11:44:18 GMT

Entity inheritance is supported and has been from the first CTP of the EF. What question 7.2 is talking about is the idea of a property of an entity which is not itself an entity (it doesn't have identity, it can't participate in a relationship, etc.) but which does have some structure. We call those complex types. Complex types do not support inheritance and won't for v1, but entities do support it.

A little more about SP1 Beta and the EF

system.data.objects dev guy — Wed, 14 May 2008 11:55:24 GMT

Just a quick note to point out a few interesting things about the updated version of the EF which shipped

EF FAQ

Matthieu MEZIL — Wed, 14 May 2008 15:34:53 GMT

Daniel Simmons vient de publier sur son blog une FAQ de l'Entity Framework mise à jour avec la nouvelle

Entity Framework FAQ : atualizado e com novas questões.

Arquitetura de Soluções — Sat, 17 May 2008 01:08:29 GMT

Olá pessoal, tudo certo? Para quem anda acompanhando a evolução do Entity Framework, componente importante

Entity Framework FAQ - v0.5

Jorge Serrano - MVP Visual Developer - Visual Basic — Wed, 21 May 2008 09:56:43 GMT

Danny Simmons , el cual trabaja en el equipo de Entity Framework y al cual tuve la oportunidad de conocer

EF FAQ Updated

Matthieu MEZIL — Wed, 21 May 2008 15:11:47 GMT

Daniel Simmons updated EF FAQ .

re: Entity Framework FAQ

Mohammad Tajari — Fri, 30 May 2008 12:40:43 GMT

As I recall in traditional ADO.NET, it was possible to update a portion of a dataset in order to split persistance operations. Here if SaveChange method of ObjectContext has the ability of persisting some portions of modified and disconnected entities it would be great if I extend my created entities to Save themeself.

As entities here are in disconnected mode so it might not all other entities receive the reflected changes by database and some exceptions might be thrown. But It is acceptable and I think it would be still great to be able to Save only a desired portion of entities.

re: Entity Framework FAQ

dsimmons@microsoft.com — Fri, 30 May 2008 16:56:34 GMT

The EF does not have the ability to persist part of the changes to a context. There are several reasons for this:

1) The EF model includes entities and relationships as largely separate things while in the CLR object model they overlap quite a bit such that an entity has references to other entities which imply relationships. If you were to save just an entity, for instance, there are some difficult questions about what that means to the relationships--especially once you look at concurrency checks, relationships which can be modeled either as foreign keys inline in a row or out in link tables, etc.

2) The idea behind the context is a bit different from the dataset. It's not intended as a big in memory cache so much as something which represents a unit of work. So if you have multiple changes to entities which you want to persist separately, the general recommendation would be to use separate contexts.

- Danny

Entity Framework FAQ - v0.6

Jorge Serrano - MVP Visual Developer - Visual Basic — Fri, 06 Jun 2008 10:10:26 GMT

Danny Simmons , del equipo de Entity Framework ha publicado una nueva actualización de su ya interesante

EF FAQ new update

Matthieu MEZIL — Fri, 06 Jun 2008 11:05:48 GMT

Daniel Simmons updated EF FAQ . What are the changes? (from Daniel 's post ). Updated: 1.2 Where

Entity Framework FAQ(转)

江南白衣 — Wed, 11 Jun 2008 19:07:30 GMT

The Entity Framework enables developers to reason about and write queries in terms of the EDM model rather than the logical schema of tables, joins, foreign keys, and so on. Many enterprise systems have multiple applications/databases with varying degrees

EF Faq

Jo-wen Mei — Fri, 01 Aug 2008 15:53:34 GMT

veel handige info over Entity Framework

re: Entity Framework FAQ

Florian S. — Tue, 05 Aug 2008 17:26:21 GMT

How to use Stored Procedures that only return simple data types like double, float and so on?

Thanks in advance!

Entity Classes & Architecture Patterns

system.data.objects dev guy — Sun, 10 Aug 2008 11:09:18 GMT

Entity Classes & Architecture Patterns Part of the Entity Framework FAQ . 2. Architecture and Patterns

Entity Classes & Architecture Patterns

system.data.objects dev guy — Sun, 10 Aug 2008 11:12:12 GMT

Entity Classes & Architecture Patterns Part of the Entity Framework FAQ . 2. Architecture and Patterns

Query

system.data.objects dev guy — Sun, 10 Aug 2008 11:19:16 GMT

Part of the Entity Framework FAQ . 6. Query 6.1. How is Span used? What is Span? (aka. How does the EF

Object Services & Using the APIs

system.data.objects dev guy — Sun, 10 Aug 2008 11:22:49 GMT

Part of the Entity Framework FAQ . 9. Object Services 9.1. What is ObjectContext.Detach() method used

Entity Services, Metadata & Mapping

system.data.objects dev guy — Sun, 10 Aug 2008 11:27:48 GMT

Part of the Entity Framework FAQ . 13. EDM 13.1. Does Entity Framework support Abstract types in EDM

Miscellaneous

system.data.objects dev guy — Sun, 10 Aug 2008 11:30:46 GMT

Part of the Entity Framework FAQ . 18. Multi-threading 18.1. What is the recommendation for running a

EF FAQ updated

system.data.objects dev guy — Tue, 12 Aug 2008 10:06:41 GMT

As always, the FAQ lives at http://blogs.msdn.com/dsimmons/pages/entity-framework-faq.aspx New in this

Links for QBS Event Wed 17th Sept

Eric and the .NET Framework — Thu, 18 Sep 2008 01:00:55 GMT

As promised, the links from my session today on the new data stuff on 3.5 and 3.5 SP1. Thanks for listening.

2008-09-24 Visual Studio 2008 Seminar

UK Developer Events - Post Event Resources — Fri, 26 Sep 2008 23:26:42 GMT

Presentation: Data and Data Access - State of the Nation Presenter: Eric Nelson http://blogs.msdn.com/ericnel

2008-10-02 Whats new in Visual Studio 2008 SP1

UK Developer Events - Post Event Resources — Thu, 02 Oct 2008 21:28:57 GMT

Presentation: Presenter: Mike Ormond Presentation: Whats new in Data Presenter: Eric Nelson http://blogs.msdn.com/ericnel

Editing Data from Two Tables in a Single DataGridView

Beth Massi - Sharing the goodness that is VB — Thu, 16 Oct 2008 04:31:26 GMT

I've had a lot of questions lately on how to display data from two separate tables in the database into

转载：ADO.NET Entity Framework 试水系列索引（2008/9/9更新，本系列结束）

罗爱军 — Mon, 20 Oct 2008 12:41:09 GMT

VisualStudio2008发布时，微软给我们带来了LinQtoSQL，解决所谓

2008-10-24 MSDN Roadshow Re-Run

UK Developer Events - Post Event Resources — Fri, 24 Oct 2008 16:29:05 GMT

Session 1 ADO.NEXT – Entity Framework & Data Services Speaker: Eric Nelson http://blogs.msdn.com/ericnel

Updated EF FAQ posted

system.data.objects dev guy — Thu, 08 Jan 2009 19:56:39 GMT

I made a round of updates to the EF FAQ a while back but then had some trouble with the blog software

Entity Framework FAQ

Coffee, smoke and techilicious burps at 3.47 AM — Fri, 09 Jan 2009 10:14:35 GMT

Lately everyone in my team and around my bay have been talking about Entity Framework. Well since I have

Entity Framework FAQ

Coffee, smoke and techilicious burps at 3.47 AM — Fri, 09 Jan 2009 10:14:55 GMT

Lately everyone in my team and around my bay have been talking about Entity Framework. Well since I have

Tech-Ed Brasil 2009 está chegando...

Waldemir Cambiucci Solutions Architect Microsoft Brasil — Wed, 27 May 2009 22:35:51 GMT

Olá pessoal, tudo certo? Aqui no blog tenho aproveitado para falar bastante sobre os vários cenários