ENTITY FRAMEWORK in VB.NET

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I have to admit I had heard nothing but bad things about Entity Framework before I starting writing this chapter so I wasn t looking forward to it. However, after working with EF for some time I have to admit I really quite like it. I am cautious, however, with recommending its use, since Microsoft can be fickle with their data access strategies. I would consider that a mature open-source solution such as NHibernate probably has less chance of being dropped and has a large community around to support and offer advice. Thus it could be said that NHibernate is potentially a safer option from a future proofing point of view. In conclusion, while EF is not as feature-rich as some of its competitors, it is arguably easier to use, integrates well with other Microsoft technologies, performs well (http://gregdoesit.com/2009/08/ nhibernate-vs-entity-framework-a-performance-test/) and I heartily recommend you investigate it further.
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References/Further reading
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Programming Entity Framework by Julia Lerman (O Reilly, 2009); a fantastic book can t recommend enough) http://thedatafarm.com/blog/ http://en.wikipedia.org/wiki/ADO.NET_Entity_Framework http://blogs.msdn.com/efdesign/ http://blogs.msdn.com/adonet/ http://codebetter.com/blogs/ian_cooper/archive/2008/06/26/the-criticism-ofthe-entity-framework-is-not-just-around-domain-driven-design.aspx http://efvote.wufoo.com/forms/ado-net-entity-framework-vote-of-noconfidence/ http://ormbattle.NET/ http://ayende.com/blog/
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WCF Data Services (previously Astoria and ADO.NET Data Services) allows data to be modified and exposed over an HTTP RESTful interface. WCF Data Services (WDS) contains a rich query language and can be accessed easily with automatically generated proxy classes or crafting raw HTTP requests. WCF Data Services supports returning data in a number of popular data formats such as XML, AtomPub, and JSON and is potentially very useful for integration scenarios and applications that don t maintain a direct connection to the database such as Silverlight.
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NOTE During the course of writing this chapter, Microsoft changed the name of ADO.NET Data Services to WCF Data Services. However, the VS template names have not changed yet, so the examples in this chapter use the ADO.NET Data Services template names.
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Before we can get started with WDS we are going to need some data to play with. If you haven t already done so, please refer to the introduction and set up the example database. In this chapter we will be using SQL Server 2008, but don t think that you are limited to using just SQL Server since WDS will work with anything supported by Entity Framework ( 8). To expose our data we have to perform four steps: 1. 2. 3. 4. Create Entity Framework classes for the data we want to expose Create a host ASP.NET application for the WDS service Create the WDS service Configure access rules for the service
Let s get started. Open Visual Studio and create a new ASP.NET web site; change the Web location dropdown to HTTP and enter the location as http://localhost/9/.
WCF DATA SERVICES
WARNING Hosting WCF Data Services in IIS on one machine gave me HTTP 500 whenever I tried to query data. I never got to the bottom of why this was, so all I can say is if you experience this try working with the local web server instead.
Entity Framework
WDS needs to know how the data we want to expose is structured and related. We will utilize the Entity Framework to provide this information: 1. 2. 3. Add a new ADO.NET entity data model to the project. Call the ADO.NET entity data model 9Model.edmx. Click Add.
Figure 9-1. Adding ADO.NET entity data model 4. Visual Studio will ask you about placing these files in the App_Code directory. Agree to this.
WCF DATA SERVICES
Visual Studio will now ask you how you want it to generate the model. Select the "Generate from database model" option and then click Next.
Figure 9-2. Generate model from database 6. If you don t have a connection already to the example database, then create one by clicking New Connection and enter the connection details for the example database.
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