By Scott Klein
Formerly, SQL builders were capable of virtually completely forget about the SQLCLR and deal with it as a peripheral technology—almost an extension to the most product. With the appearance of LINQ and the Entity Framework, this is often not the case, and the SQLCLR is relocating to the heart degree. It’s a robust product yet, for lots of, it truly is a completely new approach of operating with facts. professional Entity Framework 4.0 may also help readers comprehend the consequences of the Entity Framework and the way it may be used to alter their improvement practices and make their databases extra strong and versatile. considering the fact that many readers may be encountering this topic for the 1st time, the publication will create an inclusive setting during which the techniques of .NET improvement are approached from the viewpoint of the Relational T–SQL developer to foster a feeling of shared–ownership in line with Microsoft’s most up-to-date top practices.* finished assurance of the recent better and tougher integration with .NET 3.5* Written from a real–world standpoint and examines the positive aspects provided through LINQ and the Entity Framework that may aid clear up difficulties skilled by way of specialist builders* comprises perception, interpretation, research, and evangelism rather than simply simple truth [
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Note Entities, Associations, and Inheritance are discussed in Chapter 7. As the hint in the designer suggests, you can create entities by dragging the Entity object from the toolbox into the Designer. Another option is to right-click in the Designer itself and select Add ➤ Entity from the context menu. 22 CHAPTER 2 ■ THE ENTITY DATA MODEL Drag an Entity into the designer. This will create a new Entity called Entity1, with a single property called ID, as shown in Figure 2-10. Figure 2-10. EDM designer - entity The default ID property is created as a “Primary Key” for the Entity.
Navigation properties also provide collection functionality. Let’s use the case of the SalesPerson and SalesOrderHeader for this example. In my EDM, the object model will contain an Add method on the SalesOrderHeader property, which allows new SalesOrderHeader instances to be created and added. Mapping Details The Mapping Details window the lets you view and edit mappings between the conceptual model and the storage model within the EDM. edmx file. Through this window you can map entity types or associations.
If you have followed along, congratulations—you have created your first complex type. 42 CHAPTER 3 ■ THE ENTITY DATA MODEL INSIDE AND OUT Figure 3-10. Finished complex type The next step is to add it to our desired entity. Going back to the EDM, let’s add it to the Contact entity. Adding a complex type is just like adding a scalar property to an entity. Right-click on the entity you want to add the complex type to and select Add ➤ Complex Property from the context menu, as shown in Figure 3-11.
Pro Entity Framework 4.0 by Scott Klein