Adding to an existing entity data model in C#

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Adding to an existing entity data model
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Select Update Model from Database to bring up the Update Wizard Using the wizard as described in earlier sections, add the two stored procedures to the model Then right-click the designer surface to bring up the menu shown in Figure 1212 Select Model Browser, open the Stored Pro, and select Create Function cedures folder, right-click Import, as shown in Figure 1213
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The Add Function Import dialog appears, as shown in Figure 1214 Select a Return Type of Entities, and pick Orders from the drop-down
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12: LINQ to Entitie s Over view
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Mapping a stored procedure to a method
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Click OK to add a function with the same name Save Northwindedmx, and browse the regenerated Northwinddesignercs le It shows a new , in the class You can use it method, by adding the following code to Programcs:
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As expected, it brings back the orders for the speci ed customer Addientities are omitted in the following result: tional members of
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For the update procedure, we need to switch back to the designer the Northwindedmx le In the designer, click the Orders entity, and then click the second icon on the left side (the ToolTip says Map Entity to Functions) from the dropClick Select Update Function and choose down, as shown in Figure 1215
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Mapping insert, update, and delete operations to stored procedures
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The Mapping Details window shows the mapped stored procedure You can change the parameter to entity member mapping or pick the original value instead of the current value for some of the parameters However, does not use original values Hence, we will use the defaults shown in Figure 1216 based on name matching One parameter that Map it manually to the designer cannot map is by clicking the corresponding cell in the Property column and selecting the navigation property displayed
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Unfortunately, due to a restriction in the rst release of the schema, you cannot map just an update function; you need to map the insert and delete functions as well So create stored procedures for inserting and deleting orders, and map them using the steps outlined before For this discussion,
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simple stored procedures that just raise errors are enough to show how an update stored procedure is mapped After they are mapped, the stored procedures are automatically used in lieu of dynamic SQL
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Making Sense of LINQ to Relational Choices
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LINQ has proven to be a popular technology Soon after the release of the rst set of LINQ-enabled components in NET Framework 35, a number of implementations came out In this book we look at two implementation in the NET Framework LINQ to SQL and LINQ to Entities Additional implementations exist, such as that in LLBLGen At the time of this writing, there is also a rudimentary nhibernate LINQ project Given the very strong positive response to LINQ, the number and quality of implementations are likely to go up This is a very positive sign for the developer community, because they will have a good range of choices, and competition will ensure continuing improvements Given the choice, a common question is which LINQ to Relational technology is the most appropriate for current and future needs A number of blogs and online papers provide guidance on this matter Although you could get some information from these, it is best to experiment with the candidate technologies and decide which one suits your needs best The design approach, complexity, scope, limitations, performance, cost, and community support levels are quite different across various implementations of LINQ In the NET Framework, as of the rst release, LINQ to SQL is very lightweight and intentionally keeps the mapping simple It lets you write your own classes and map them directly if you want to It also lets you use a graphical or command-line tool to generate classes and mapping from a database On the other hand, EF has a much richer and more complex concept of a model between classes and tables It follows a more prescriptive pattern, with a required base class and an emphasis on separation of the classes, the model, and the database LINQ to SQL is designed to help you build robust applications quickly while helping you keep a simple, easy-tomaintain architecture Use it if you can, and move on to LINQ to Entities if
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