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barcodelib c# ADVANCED MODELING in Font
ADVANCED MODELING Generating Quick Response Code In None Using Barcode maker for Font Control to generate, create QR image in Font applications. www.OnBarcode.comPrint Barcode In None Using Barcode drawer for Font Control to generate, create Barcode image in Font applications. www.OnBarcode.comRight-click the design surface and select Add Association. Select a multiplicity of one on the Customer side and a multiplicity of many on the Order side. Rename the Order navigation property to Orders because it refers to a set of orders. Uncheck the Add foreign key properties to the Order entity check box. Right-click the new association and view its properties. Click in the Referential Constraint box. In the dialog box, set the Principal to Customer and the Dependent Property to CustomerId. See Figure 15-22. Select the Order entity and view the Mapping Details window. In the Mapping Details window click the Map Entities to Functions button (second button on the left). Map the Order Insert, Update, and Delete stored procedures to the Insert, Update, and Delete actions. Figures 15-23 and 15-24 show the mappings for the parameters and returned values for the actions. Code39 Creator In None Using Barcode creator for Font Control to generate, create Code 39 Full ASCII image in Font applications. www.OnBarcode.comGenerate QR In None Using Barcode generator for Font Control to generate, create QR Code ISO/IEC18004 image in Font applications. www.OnBarcode.comListing 15-23. View that combines FirstName and LastName and computes the total orders create view chapter15.vwCustomer as select c.*,c.FirstName + ' ' + c.LastName as FullName, (select COUNT(*) from chapter15.[Order] where CustomerId = c.CustomerId) TotalOrders from chapter15.Customer c go create view chapter15.vwOrder as select o.*,os.Description OrderStatus,s.Description ShippingType from chapter15.[Order] o join chapter15.OrderStatusType os on os.OrderStatusTypeId = o.OrderStatusTypeId join chapter15.ShippingType s on s.ShippingTypeId = o.OrderStatusTypeId Listing 15-24. Stored procedure implementations for the Insert, Update, and Delete actions for the Customer and Order entities create procedure chapter15.InsertCustomer (@FirstName varchar(50), @LastName varchar(50), @FullName varchar(50)) as begin insert into chapter15.Customer(FirstName,LastName) values (@FirstName,@LastName) select SCOPE_IDENTITY() CustomerId end go create procedure chapter15.UpdateCustomer (@FirstName varchar(50), @LastName varchar(50), @FullName varchar(50), @CustomerId int) as Paint Barcode In None Using Barcode printer for Font Control to generate, create Barcode image in Font applications. www.OnBarcode.comUPC-A Supplement 5 Encoder In None Using Barcode maker for Font Control to generate, create UPCA image in Font applications. www.OnBarcode.comADVANCED MODELING
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Code39 Scanner In Visual Basic .NET Using Barcode scanner for .NET Control to read, scan read, scan image in .NET framework applications. www.OnBarcode.comBarcode Generator In Objective-C Using Barcode printer for iPhone Control to generate, create Barcode image in iPhone applications. www.OnBarcode.comFigure 15-24. Mappings for the parameters and returned values for the Insert, Update, and Delete actions for the Order entity The completed model is shown in Figure 15-25. Figure 15-25. The completed model
ADVANCED MODELING
How It Works
To expose the computed column TotalOrders and to combine the shipping type and order status descriptions from the lookup tables we created two views and built our model around these views. When we use views in this way, we are required to provide the Insert, Update, and Delete actions. Entity Framework has no way of automating these CRUD operations on views. The stored procedures in Listing 15-24 provide an implementation of these actions. In the mapping of the parameters and returned values from these stored procedures, it is important to note that the returned value of the procedure mapped to the insert action must be the key for the entity. In our case, these keys were CustomerId and OrderId. Failing to map these returned values will result in a runtime error. When we imported the views, Entity Framework marked each of the properties as part of the key for the entity. Of course, Entity Framework has no way of knowing which, if any, of the columns from the view are part of the key. As it does with tables that have no primary key constraint, it simply combines all the columns into the entity key. We removed all but the Id properties from the keys both on the design surface and in the .edmx file. The code in Listing 15-25 demonstrates inserting into and retrieving from our model. We use code not shown in this Listing to populate the lookup tables. Listing 15-25. Inserting into and retrieving from our model using (var context = new EFRecipesEntities()) { // insert our lookup values context.ExecuteStoreCommand(@"insert into chapter15 .orderstatustype(OrderStatusTypeId, Description) values (1,'Processing')"); context.ExecuteStoreCommand(@"insert into chapter15 .orderstatustype(OrderStatusTypeId, Description) values (2,'Shipped')"); context.ExecuteStoreCommand(@"insert into chapter15 .shippingtype(ShippingTypeId, Description) values (1,'UPS')"); context.ExecuteStoreCommand(@"insert into chapter15 .shippingtype(ShippingTypeId, Description) values (2,'FedEx')"); } using (var context = new EFRecipesEntities()) { var c1 = new Customer { FirstName = "Robert", LastName = "Jones" }; var o1 = new Order { OrderDate = DateTime.Parse("11/19/2009"), OrderStatusTypeId = 2, ShippingTypeId = 1, Customer = c1 }; var o2 = new Order { OrderDate = DateTime.Parse("12/13/09"), OrderStatusTypeId = 1, ShippingTypeId = 1, Customer = c1 }; var c2 = new Customer { FirstName = "Julia", LastName = "Stevens" }; var o3 = new Order { OrderDate = DateTime.Parse("10/19/09"), OrderStatusTypeId = 2, ShippingTypeId = 2, Customer = c2 }; context.Customers.AddObject(c1); context.Customers.AddObject(c2);
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