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ENTITY DATA MODELING FUNDAMENTALS
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Listing 2-7. Inserting into and retrieving from our model with the Product entity type using (var context = new EFRecipesEntities()) { var product = new Product { SKU = 147, Description = "Expandable Hydration Pack", Price = 19.97M, ImageURL = "/pack147.jpg" }; context.Products.AddObject(product); product = new Product { SKU = 178, Description = "Rugged Ranger Duffel Bag", Price = 39.97M, ImageURL = "/pack178.jpg" }; context.Products.AddObject(product); product = new Product { SKU = 186, Description = "Range Field Pack", Price = 98.97M, ImageURL = "/noimage.jp" }; context.Products.AddObject(product); product = new Product { SKU = 202, Description = "Small Deployment Back Pack", Price = 29.97M, ImageURL = "/pack202.jpg" }; context.Products.AddObject(product); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { foreach (var p in context.Products) { Console.WriteLine("{0} {1} {2} {3}", p.SKU, p.Description, p.Price.ToString("C"), p.ImageURL); } } The code in Listing 2-7 produces the following results: 147 Expandable Hydration Pack $19.97 /pack147.jpg 178 Rugged Ranger Duffel Bag $39.97 /pack178.jpg 186 Range Field Pack $98.97 /noimage.jpg 202 Small Deployment Back Pack $29.97 /pack202.jpg
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2-7. Splitting a Table Across Multiple Entities
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You have a table with some frequently used fields and a few large but rarely needed fields. For performance reasons, you want to avoid needlessly loading these expensive fields on every query. You want to split the table across two or more entities.
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Let s say you have a table like the one shown in Figure 2-21, which holds information about photographs as well as the bits for both the thumbnail and the full-resolution image of the photograph.
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Figure 2-21. A Photograph table with a field holding the binary large object (blob) representing the data for the image To create an entity type that contains the reasonably low cost and frequently used columns, as well as an entity type containing the high cost, rarely used HighResolutionBits column, do the following: 1. Add a new model to your project by right-clicking your project and selecting Add New Item. Choose ADO.NET Entity Data Model from the Visual C# Data templates. Select Generate from database. Click Next. Use the wizard to select an existing connection to your database or create a new connection. From the Choose Your Database Object dialog box, select the Photograph table. Leave the Pluralize and Foreign Key options checked. Click Finish. Right-click the design surface and select Add Entity. In the dialog box, change the Entity name to PhotographFullImage. Also, change the Key Property name to PhotoId. This is the same name as the key column in the Photograph entity type. See Figure 2-22. Click OK to add the PhotographFullImage entity type to the model. Move the HighResolutionBits property from the Photograph entity type to the PhotographFullImage entity. You can use select/cut/paste to move the property.
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2. 3. 4. 5.
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ENTITY DATA MODELING FUNDAMENTALS
Click the newly created PhotographFullImage entity type to view the Mapping Details window. If the Mapping Details window is not visible, show it by selecting View Other Windows Entity Data Model Mapping Details. In the Mapping Details window for the PhotographFullImage entity, click Add a Table or View and select the Photograph table. Map the HighResolutionBits column to the HighResolutionBits property. Map the PhotoId column to the PhotoId property. See Figure 2-23. Right-click the Photograph entity. Select Add Association. Add a one-to-one association between the Photograph entity and the PhotographFullImage entity. Make sure you do two things: choose 1 (one) for the multiplicity on both ends of the association and uncheck the Add foreign key properties to the Entity check box. See Figure 2-24.
10. Right-click the association link between the entities and select Properties. In the Referential Constraint under the Constraints section, click the button to add a referential constraint. Set the Principal to Photograph and make sure the key properties are set to PhotoId for both the principal and dependent entities. See Figure 2-25.
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