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from EFRecipesEntities.Orders as o where o.OrderAmount > anyelement(select value Avg(o.OrderAmount) from EFRecipesEntities.Orders as o) group by o.Customer.Name"; var summary = context.CreateQuery<DbDataRecord>(esql); foreach (var item in summary) { Console.WriteLine("\t{0}, Total Orders: {1}, Total: {2:C}", item["Name"], item["TotalOrders"], item["TotalPurchases"]); } } The output of the code in Listing 11-14 is the following: Customers with above average total purchases Bob Meyers, Total Orders: 1, Total: $99.39 Robin Rosen, Total Orders: 1, Total: $101.29
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How It Works
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In this recipe, we used the canonical functions Count(), Sum(), and Avg(). These functions are independent of the data store, which means that they are portable and return types in the EDM space rather than data store-specific types or CLR types. The current release of Entity Framework introduced the EntityFunctions class, which exposes these canonical functions to LINQ queries as well.
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11-9. Using Canonical Functions in LINQ
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Problem
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You want to use canonical functions in a LINQ query.
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Solution
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Let s say you have a model for movie rentals like the one in Figure 11-9. The MovieRental entity holds the date the movie was rented and the date it was returned, as well as any late fees that have been accumulated.
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FUNCTIONS
Code 128C Creator In C#.NET
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Figure 11-9. The MovieRental entity that has the dates for a rental period along with any late fees You want to retrieve all the movies that were returned more than 10 days after they were rented. These are the late movies. To create and use this query, follow the pattern shown in Listing 11-15. Listing 11-15. Retrieving the late movies using the DateDiff() function using (var context = new EFRecipesEntities()) { var mr1 = new MovieRental { Title = "A Day in the Life", RentalDate = DateTime.Parse("2/19/2010"), ReturnedDate = DateTime.Parse("3/4/2010"),LateFees = 3M }; var mr2 = new MovieRental { Title = "The Shortest Yard", RentalDate = DateTime.Parse("3/15/2010"), ReturnedDate = DateTime.Parse("3/20/2010"), LateFees = 0M }; var mr3 = new MovieRental { Title = "Jim's Story", RentalDate = DateTime.Parse("3/2/2010"), ReturnedDate = DateTime.Parse("3/19/2010"), LateFees = 3M }; context.MovieRentals.AddObject(mr1); context.MovieRentals.AddObject(mr2); context.MovieRentals.AddObject(mr3); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { Console.WriteLine("Movie rentals late returns"); Console.WriteLine("=========================="); var late = from r in context.MovieRentals where EntityFunctions.DiffDays(r.RentalDate, r.ReturnedDate) > 10 select r; foreach (var rental in late) { Console.WriteLine("{0} was {1} days late, fee: {2}", rental.Title, (rental.ReturnedDate - rental.RentalDate).Days - 10, rental.LateFees.ToString("C")); } }
FUNCTIONS
The output of the code in Listing 11-15 is the following: Movie rentals late returns ========================== A Day in the Life was 3 days late, fee: $3.00 Jim's Story was 7 days late, fee: $3.00
How It Works
Canonical functions, which are defined in Entity Framework, are data source-agnostic and supported by all data providers. The types returned from canonical functions are defined in terms of types from the Entity Data Model. In this recipe, we used the DiffDays() function to calculate the number of days between the start and end of the rental period. Because DiffDays() is a canonical function, it will be implemented by all providers.
Best Practice
When should I use EntityFunctions Entity Framework provides translations for some expressions into the canonical functions, but the translation is limited. Not every CLR method will translate to the corresponding canonical function. Here s the best practice. If there is a translation available, use it. It makes the code easier to read. If there is no translation available, use the EntityFunction class to explicitly call the canonical function, as in the following:
var laterentals = from r in context.MovieRentals where (r.ReturnedDate - r.RentalDate).Days > 10 select r;
does not translate to the Canonical Function, so you should use,
var laterentals = from r in context.MovieRentals where EntityFunctions.DiffDays(r.RentalDate, r.ReturnedDate) > 10 select r;
FUNCTIONS
11-10. Calling Database Functions in eSQL
Problem
You want to call a database function in an eSQL statement.
Solution
Let s say you have an eCommerce website and you need to find all the customers within a certain distance of a given ZIP code. Your model might look like the one in Figure 11-10.
Figure 11-10. WebCustomer and Zip entities in a model We ll need to pull out some basic math functions to get this to work. Unfortunately, Entity Framework does not have the canonical functions we need, so we ll have to use the functions available in the data store. Use the pattern in Listing 11-16 to call the database functions from an eSQL expression. Listing 11-16. Using database functions to determine the distance between a customer and a given ZIP code using (var context = new EFRecipesEntities()) { var c1 = new WebCustomer { Name = "Alex Stevens", Zip = "76039" }; var c2 = new WebCustomer { Name = "Janis Jones", Zip = "76040" }; var c3 = new WebCustomer { Name = "Cathy Robins", Zip = "76111" }; context.Zips.AddObject(new Zip { Latitude = 32.834298M, Longitude = -32.834298M, ZipCode = "76039" }); context.Zips.AddObject(new Zip { Latitude = 32.835298M, Longitude = -32.834798M, ZipCode = "76040" }); context.Zips.AddObject(new Zip { Latitude = 33.834298M, Longitude = -31.834298M, ZipCode = "76111" }); context.WebCustomers.AddObject(c1); context.WebCustomers.AddObject(c2); context.WebCustomers.AddObject(c3);
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