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foreach (var customer in customers) { Console.WriteLine("{0} [email: {1}]", customer.Name, customer.Email); } } The following is the output from the code in Listing 3-17: Customers Ro* Roberts, Jill [email: jroberts@abc.com] Robertson, Alice [email: arob@gmail.com] Roe, Allen [email: allenr@umc.com]
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Customers Ro* Roberts, Jill [email: jroberts@abc.com] Robertson, Alice [email: arob@gmail.com] Roe, Allen [email: allenr@umc.com]
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Customers Ro* Roberts, Jill [email: jroberts@abc.com] Robertson, Alice [email: arob@gmail.com] Roe, Allen [email: allenr@umc.com]
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In Listing 3-17 we show three different solutions to the problem. In the first solution, we use LINQ builder methods to construct the query. We use the Where() method to filter the results to customers whose last name starts with Ro. Because we are using the StartsWith() method inside the lambda expression, we don t need to use a SQL wildcard expression such as Ro% . After filtering, we use the OrderBy() method to order the results. Ordered results are required by the Skip() method. We use the Skip() method to move over pageIndex number of pages, each of size pageSize. We limit the results with the Take() method. We only need to take one page of results.
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In the next solution, we use Entity SQL builder methods to construct the query. We use the Where() and Skip() builder methods as we did in the LINQ solution but this time with Entity SQL syntax. For limiting the result set size, we use the Top() method. One difference is that we don t need to use the OrderBy() method. The Skip() method takes a parameter to name the column on which to perform the ordering. Ordering is important for the Skip() method because without it, the query results would not be repeatable. For the last solution we construct a complete, parameterized Entity SQL expression. This is perhaps the most familiar way to solve the problem, but it exposes some of the inherent mismatch between a query language expressed in a string and executable code expressed, in this case, in C#.
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3-15. Grouping by Date
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You have an entity type with a DateTime property and you want to group instances of this type based on just the date portion of the property.
Solution
Let s say you have a Registration entity type in your model and the Registration type has a DateTime property. Your model might look like the one in Figure 3-16.
Figure 3-16. A model with a single Registration entity type. The entity type s RegistrationDate property is a DateTime. We want to group all the registrations by just the date portion of the RegistrationDate property. You might be tempted in LINQ to group by RegistrationDate.Date. Although this will compile, you will receive a runtime error complaining that Date can t be translated into SQL. To group by just the date portion of the RegistrationDate, follow the pattern in Listing 3-18. Listing 3-18. Grouping by the date portion of a DateTime property using (var context = new EFRecipesEntities()) { context.Registrations.AddObject(new Registration { StudentName = "Jill Rogers", RegistrationDate = DateTime.Parse("12/03/2009 9:30 pm") }); context.Registrations.AddObject(new Registration {
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StudentName = "Steven Combs", RegistrationDate = DateTime.Parse("12/03/2009 10:45 am") }); context.Registrations.AddObject(new Registration { StudentName = "Robin Rosen", RegistrationDate = DateTime.Parse("12/04/2009 11:18 am") }); context.Registrations.AddObject(new Registration { StudentName = "Allen Smith", RegistrationDate = DateTime.Parse("12/04/2009 3:31 pm") }); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { var groups = from r in context.Registrations group r by EntityFunctions.TruncateTime(r.RegistrationDate) into g select g; foreach (var element in groups) { Console.WriteLine("Registrations for {0}", ((DateTime)element.Key).ToShortDateString()); foreach (var registration in element) { Console.WriteLine("\t{0}", registration.StudentName); } } } The following is the output of the code in Listing 3-18: Registrations for 12/3/2009 Jill Rogers Steven Combs Registrations for 12/4/2009 Robin Rosen Allen Smith
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