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So the Entity Framework allows us to control the mapping. We can define a conceptual model that describes the entities as we d like to work with them from C#, along with mappings that describe how that model maps onto the underlying storage. The EF also requires us to provide a store schema, which is a definition of the structure we expect it to find in the database. This may seem redundant after all, the database knows its own schema, so why would the EF need a copy There are a couple of reasons. First, it s possible to define the model before you create the database you can generate a database schema from the store schema. Second, you can configure aspects of how the Entity Framework uses the database, such as whether it uses queries or stored procedures to access particular tables. Settings that are associated with the database itself rather than what the EF does with data belong in the store schema rather than the mappings or conceptual schema. The three parts shown in Figure 14-1 the conceptual model, the storage model, and the mappings between them are collectively known as the Entity Data Model, or EDM.

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There are many constraints on the conceptual model, because the model is useful only if you can construct a successful mapping. There are limits on what mappings are able to do, so your existing database structure will impose some restrictions on the model. Developers who are new to the Entity Framework often find that they have a lot less freedom in the design of the conceptual model than they first presumed. We ll see what mappings are possible in due course, but for now, do not imagine that the EF is able to take any arbitrary conceptual model and bridge it to any old database structure there is necessarily a close relationship between the database and the conceptual model.

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If you use the EF in the simplest way possible, your conceptual model will be the same as your storage model, and the mapping will be very straightforward. If you use Visual Studio s wizard for adding EF support to a project, you ll end up with exactly this sort of direct mapping, with one entity type for each table or view you import. But you can then tweak things to suit your needs. We ll walk through the wizard now even though it produces a straightforward mapping where the conceptual model matches the storage model, it still has to generate a complete set of model and mapping definitions, so it s instructive to look at what it produces. You can add EF support to any .NET project (except for Silverlight projects). We ll use a console application for the examples. In the Add New Item dialog, we ll select Visual C# Items Data, and then choose the ADO.NET Entity Data Model item template, calling the new file AdventureWorksModel . When you add an Entity Data Model to your project, Visual Studio asks whether you want to start from scratch or base your model on an existing database. We ll choose that simpler second option. If you ve previously told Visual Studio about any databases you re using either via the Server Explorer toolbar or by using this or other

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data-related wizards it will show them in a drop down, but you can provide Visual Studio with new connection details from within the wizard. For this walkthrough, we re going to connect to the AdventureWorksLT2008 sample database.

The wizard uses the name of your connection for one of the types that it generates. You ll see the identifier AdventureWorksLT2008Entities cropping up in various examples later. If you happen to give your connection a different name in Visual Studio, you ll need to use that name in the code.

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