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Insert the code in Listing 11-13 just below the <Schema> tag in the conceptual models section of the .edmx file. This defines the function in the model. Insert into and query the model using code similar to pattern shown in Listing 11-14.

ADO and OLEDB, Microsoft s COM-based data access technology, was designed when the client-server model of application development was at its peak As the Web caused distributed application development to move to the fore, ADO had to be modified to account for architectural differences that worked well in a client server environment, but were not scalable enough for distributed applications ADONET was designed from the ground up for distributed architectures, formalizing a disconnected model of data access into the object model One of the major drawbacks of working with Recordsets (the type for working with result sets with COM-based ADO) was that it was hard to know in what situations you should use which cursor and locking models Furthermore, there was very little discernable difference in how the developer interacted with the result set regardless of the cursor model used.

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5 This is also an argument against the notion of 100% code coverage, which, in 5, we suggested to be a self-defeating exercise. 6

Listing 11-13. The definition of the PlatinumSponsors() function <Function Name="PlatinumSponsors"> <ReturnType> <CollectionType> <ReferenceType Type="EFRecipesModel.Sponsor" /> </CollectionType> </ReturnType> <DefiningExpression> select value ref(s) from EFRecipesEntities.Sponsors as s where s.SponsorType.Description == 'Platinum' </DefiningExpression> </Function> Listing 11-14. Using eSQL and our PlatinumSponsors() function to find all events with Platinum level sponsors using (var context = new EFRecipesEntities()) { var platst = new SponsorType { Description = "Platinum" }; var goldst = new SponsorType { Description = "Gold" }; var sp1 = new Sponsor { Name = "Rex's Auto Body Shop", SponsorType = goldst };

In short, it was very easy to use ADO result sets in a way that could negatively impact performance and scalability A developer needed to understand the internals of the Recordset cursor model in order to choose the cursor and locking models most appropriate in specific circumstances ADONET gives you a choice of how to work with result sets with two different data access models One is an in-memory model, and the other is a low memory footprint, row-based approach Each of these models is implemented with different classes, meaning you work with different objects depending on which method you employ The programming models between the two methods are different, and this makes it clear to the developer which technique he s using This clear differentiation should reduce the number of times the incorrect model gets used.

Verification of Object-Oriented Software: The KeY Approach. ISBN: 978-3-540-68977-5

var sp2 = new Sponsor { Name = "Midtown Eye Care Center", SponsorType = platst }; var sp3 = new Sponsor { Name = "Tri-Cities Ford", SponsorType = platst }; var ev1 = new Event { Name = "OctoberFest", Sponsor = sp1 }; var ev2 = new Event { Name = "Concerts in the Park", Sponsor = sp2 }; var ev3 = new Event { Name = "11th Street Art Festival", Sponsor = sp3 }; context.Events.AddObject(ev1); context.Events.AddObject(ev2); context.Events.AddObject(ev3); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { Console.WriteLine("Events with Platinum Sponsors"); Console.WriteLine("============================="); var esql = @"select value e from EFRecipesEntities.Events as e where ref(e.Sponsor) in (EFRecipesModel.PlatinumSponsors())"; var events = context.CreateQuery<Event>(esql); foreach (var ev in events) { Console.WriteLine(ev.Name); } } The output of the code in Listing 11-13 is the following: Events with Platinum Sponsors ============================= Concerts in the Park 11th Street Art Festival

The <ReferenceType> element in the conceptual model denotes a reference to an entity type. This means that we are returning a reference to an entity, not the complete entity. Our model defined function returns a collection of references to Platinum level sponsors. To illustrate using our function, we created an eSQL expression in Listing 11-13 to get all the events with Platinum level sponsors. There are, of course, lots of different ways to get the events sponsored by Platinum level sponsors, but by encapsulating the collection of Platinum level sponsors in our model defined function, we introduce a bit of code reusability. We didn t show a corresponding use in a LINQ query because the bootstrapping code would need to return an IQueryable<EntityKey>, which is fine, but a subsequent Contains clause would not work because the result is not strongly typed.

However, choosing the correct model still requires a clear understanding of the differences, the features, and trade-offs of each one..

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