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We used the AccountId column as the discriminator in the Table per Hierarchy inheritance model. We also used the AccountId column in a conditional association to the Account entity. It may seem strange for the association between Account and Customer to be one-to-many. We know that each customer has exactly one account and that AccountIds are unique across instances of the Contact entity. However, the AccountId foreign key in Contact is not an entity key. From the model s perspective, there is no guarantee that the AccountId foreign key provides for the expected one-to-one relationship to the Account table. The code in Listing 15-1 demonstrates inserting into and querying our model. Listing 15-1. Inserting and querying our model using (var context { var acc1 = new var con1 = new var cus1 = new = new EFRecipesEntities())
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Account { Balance = 99.34M }; Contact { Name = "Stacy Jones", Phone = "867-5301" }; Customer { Name = "Bill Waters", Phone = "907-2212", Account = acc1 }; context.Contacts.AddObject(con1); context.Contacts.AddObject(cus1); context.SaveChanges();
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} using (var context = new EFRecipesEntities()) { context.ContextOptions.LazyLoadingEnabled = true; Console.WriteLine("All Contacts"); Console.WriteLine("============"); foreach (var contact in context.Contacts) { Console.WriteLine("{0} {1}", contact.Name, contact.Phone); } Console.WriteLine("Just Customers"); foreach (var contact in context.Contacts.OfType<Customer>()) { Console.WriteLine("\t{0} {1} (Balance: {2})", contact.Name, contact.Phone, contact.Account.Balance.ToString("C")); } } The following is the output of the code in Listing 15-1:
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All Contacts ============ Stacy Jones 867-5301 Bill Waters 907-2212 Just Customers Bill Waters 907-2212 (Balance: $99.34)
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15-2. Mapping an Entity to Customized Parts of One or More Tables
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You want to map an entity to parts of one or more tables, excluding some columns, changing the data types of others and adding a computed column.
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Solution
Let s suppose you have the two tables shown in Figure 15-3.
Figure 15-3. Product and Supplier tables In Figure 15-3, we have two tables: Product and Supplier. We want to map these tables to a single Product entity with the following changes. The Name property should be limited to 50 characters rather than the 100 in the underlying Product table. The Description column is not needed. The StockCount property should not be null. If the underlying StockCount column is null, the entity s StockCount property should have a value of 0. The Discontinued column should be a bit field in the entity rather than the integer field in the underlying
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table. Because you plan to use the supplier s name often, you want to include it as a property in the entity. Finally, you want to expose a computed property called IsBackOrderable on the entity. To create a model with the Product entity having the correct properties, do the following: 1. 2. 3. 4. 5. 6. Add a new ADO.NET Entity Data Model to your project and import the Product and Supplier tables. Or update an existing model with these tables. Select the Name property in the Product entity and view its properties. Change its Max Length from 100 to 50. Select the StockCount property and view its properties. Change its Nullable value from True to False. Delete the Description property from the entity. Delete the SupplierId property from the entity. Right-click the Product entity and select Add Scalar Property. Name the new property IsBackOrderable. Set its Type to Boolean. Set its Nullable property to False. Select the Discontinued property and view its properties. Change its Type from Int32 to Boolean. Right-click the Product entity and select Add Scalar Property. Name the new property SupplierName and set its Type to String with a Max Length of 50. Select the Product entity and view the Mapping Details window. Click Maps to Product and select <Delete> to delete the table mapping.
7. 8. 9.
10. Right-click the .edmx file in the Solution Explorer and select Open With XML Editor. This will close the designer and open the .edmx file in the XML Editor. 11. Add the code in Listing 15-2 to the .edmx file immediately after the <EntityContainerMapping> tag in the mapping section. Listing 15-2. QueryView to customize the Product entity <EntitySetMapping Name="Products"> <QueryView> select value EFRecipesModel.Product(p.ProductId, p.Name, case when p.StockCount is null then 0 else p.StockCount end, case when p.Discontinued = 1 then True else False end, case when p.Discontinued = 0 and s.Name == "CallComm" then True else False end, case when s.Name is null then "Unknown" else s.Name end
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