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Default behavior; add new instances to the object context Overwrite any changes made to objects in the object context Just reset the original values; don t overwrite changes in the object context Don t track objects in the object context
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3-10. Returning a Primitive Type From a Query
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You want to return only a particular property of an entity type from a query.
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Let s say we have an Organization entity type as shown in the model in Figure 3-11.
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QUERYING AN ENTITY DATA MODEL
Figure 3-11. A model with an Organization entity type Suppose that you have a query that you use in several places in your application. In this particular use, you don t need the entire entity; you just need one property, say the city, from the entity. For simplicity, let s say your query returns all the organizations in the state of Texas and you want to get just the cities from the query. To get just the cities, follow the pattern in Listing 3-13. Listing 3-13. Retrieving a primitive type using both LINQ and Entity SQL using (var context = new EFRecipesEntities()) { var o1 = new Organization { Name = "ABC Electric", City = "Azle", State = "TX" }; var o2 = new Organization { Name = "PowWow Pests", City = "Miami", State = "FL" }; var o3 = new Organization { Name = "Grover Grass & Seed", City = "Fort Worth", State = "TX" }; context.Organizations.AddObject(o1); context.Organizations.AddObject(o2); context.Organizations.AddObject(o3); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { var query = context.Organizations.Where("it.State = 'TX'"); Console.WriteLine("Cities (using LINQ)"); var cities = query.Select(o => o.City).Distinct().OrderBy(c => c); foreach (var city in cities) { Console.WriteLine("{0}", city); } Console.WriteLine("Cities (using eSQL)"); cities = query.SelectValue<string>("distinct it.City").OrderBy("it"); foreach (var city in cities) { Console.WriteLine("{0}", city); } }
QUERYING AN ENTITY DATA MODEL
The following is the output of the code in Listing 3-13: Cities (using LINQ) Azle Fort Worth Cities (using eSQL) Azle Fort Worth
How It Works
We start in Listing 3-13 by inserting a few organizations. Once these are in place, we create a new object context and build our base query. This query simply retrieves all the organizations in the state of Texas. Next, using LINQ, we use the Select() method to project just the city property from the result set. This set may contain duplicate cities, so we apply the Distinct() method to eliminate these duplicates. Finally, just for good measure, we sort the cities. For Entity SQL, we use the SelectValue() method passing in an Entity SQL expression that uses the distinct operator to remove duplicates. We sort the results. In both cases, we take a base query and we use builder methods to compose the additional operations of projection (using Select() for LINQ and SelectValue() for Entity SQL) and ordering to get the final collection of city names.
3-11. Filtering Related Entities
Problem
You want to want to retrieve some, but not all, of the related entities.
Solution
Let s say you have a model like the one in Figure 3-12.
QUERYING AN ENTITY DATA MODEL
Figure 3-12. A model for a Worker and their Accidents In this model, we have a Worker who has experienced zero or more accidents. Each accident is classified by its severity. We want to retrieve all workers, but we are interested only in serious accidents. These are accidents with a severity greater than 2. To retrieve all the workers, but to limit the accidents retrieved to just the serious ones, follow the pattern in Listing 3-14. Listing 3-14. Retrieving serious accidents using anonymous types and using CreateSourceQuery() using (var context = new EFRecipesEntities()) { var worker1 = new Worker { Name = "John Kearney" }; var worker2 = new Worker { Name = "Nancy Roberts" }; var worker3 = new Worker { Name = "Karla Gibbons" }; context.Accidents.AddObject(new Accident { Description = "Cuts and contusions", Severity = 3, Worker = worker1 }); context.Accidents.AddObject(new Accident { Description = "Broken foot", Severity = 4, Worker = worker1}); context.Accidents.AddObject(new Accident { Description = "Fall, no injuries", Severity = 1, Worker = worker2}); context.Accidents.AddObject(new Accident { Description = "Minor burn", Severity = 3, Worker = worker2}); context.Accidents.AddObject(new Accident { Description = "Back strain", Severity = 2, Worker = worker3}); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { context.ContextOptions.LazyLoadingEnabled = false; var query = from w in context.Workers select new { Worker = w,
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