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Console.WriteLine("Preferred Customers"); context.ContextOptions.LazyLoadingEnabled = true; foreach (var customer in context.PreferredCustomers) { Console.WriteLine("Name: {0}, Discount = {1}%", customer.Name, customer.CustomerDiscount.PurchaseDiscount.ToString()); foreach (var order in customer.PreferredOrders) { Console.WriteLine("\tOrder: {0}", order.Amount.ToString("C")); } } Console.WriteLine("\nRisky Customers"); foreach (var customer in context.RiskyCustomers) { Console.WriteLine("Name: {0}", customer.Name); foreach (var order in customer.RiskyOrders) { Console.WriteLine("\tOrder: {0}", order.Amount.ToString("C")); } foreach (var report in customer.CreditReports) { Console.WriteLine("\tCredit Score: {0}", report.CreditRating.ToString()); } } } The output of the code in Listing 15-30 is the following: Preferred Customers Name: Steven James, Discount = 10% Order: $19.95
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Risky Customers Name: Kathy Naudot Order: $29.99 Credit Score: 630
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15-12. Extending Table per Type with Table per Hierarchy
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You want to extend a Table per Type inheritance model with a Table per Hierarchy approach.
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Let s say you have the tables shown in Figure 15-29.
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Figure 15-29. The tables containing information about the articles and videos We want to create a model with an abstract base type for Media with two derived abstract types for articles and videos. We want to extend this Table per Type model by deriving new types representing specific kinds of articles and videos. In particular, we want to model the new types BlogPosting and Story by deriving from the Article base class. Also, we want to model the new types RecreationalVideo and EducationalVideo by deriving from the Video base class. To create the Entity Data Model, do the following: 1. 2. Add a new ADO.NET Entity Data Model to your project and import the Media, Article and Video tables. Or update an existing model with these tables. Right-click the Medium entity and select Properties. Change the Abstract property to True and change the name of the entity to Media. Also change the entity set name to Media. Delete the associations between the Media entity and the Article and Video entities. Right-click the Video entity and select Add base entity and Video as the derived entity. Inheritance. Select Media as the
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3. 4.
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5. 6. 7. 8. 9.
Right-click the Article entity and select Add Inheritance. Select Media as the base entity and Article as the derived entity. Delete the ArticleId property from the Article entity. Delete the VideoId property from the Video entity. Select the Video entity and view the Mapping Details window. Map the VideoId column to the MediaId property. Select the Article entity and view the Mapping Details window. Map the ArticleId column to the MediaId property. Right-click the Video entity and select Properties. Set the Abstract property to True. Similarly, set the Abstract property for Article entity to True.
10. Delete the VideoType and ArticleType properties from the Video and Article entities. We will use these columns as discriminators for the Table per Hierarchy inheritance. 11. Right-click the design surface and select Add Entity. Name the new entity BlogPosting and uncheck the Create key property check box. 12. Right-click the design surface and select Add Entity. Name the new entity Story and uncheck the Create key property check box. 13. Right-click the BlogPosting entity and select Add Inheritance. Select Article as the base entity and BlogPosting as the derived entity. Repeat this process for the Story entity. 14. Cut the ArticleContent and Comments properties from the Article entity and paste them into the BlogPosting entity. Rename the ArticleContent property to Post. 15. Select the BlogPosting entity and view the Mapping Details window. In the Add a Table or View drop-down, select Article. Add the condition where ArticleType = BlogPosting. Map the Post property to the ArticleContent column. 16. Right-click the Story entity and select Add property Plot. Scalar Property. Name the new
17. Select the Story entity and view the Mapping Details. In the Add a Table or View drop-down, select Article. Add the condition where ArticleType = Story. Map the Plot property to the ArticleContent column. 18. Right-click the design surface and select Add Entity. Name the new entity RecreactionalVideo and uncheck the Create key property check box. 19. Right-click the design surface and select Add Entity. Name the new entity EducationalVideo and uncheck the Create key property checkbox. 20. Right-click the RecreationalVideo entity and select Add Inheritance. Select Video as the base entity and RecreationalVideo as the derived entity. Repeat this for the EducationalVideo entity.
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