barcodelib c# Move the HireDate and Salary properties from the Person entity to the Staff entity. in Font

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Move the HireDate and Salary properties from the Person entity to the Staff entity.
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10. Right-click the Staff entity and select Properties. Set the Abstract property to True. This marks the Staff entity as abstract. 11. Right-click the design surface and select Add Principal and set its base type to Staff. Entity. Name the new entity
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12. Select the Principal entity and view the Mapping Details window. Select Add a Table or View and choose the Person table.
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13. In the Mapping Details window, add a condition for the Principal entity When Role = Principal. This maps the Principal entity when the Role is Principal. 14. Right-click the design surface and select Add Instructor and set its base type to Staff. Entity. Name the new entity
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15. Select the Instructor entity and view the Mapping Details window. Select Add a Table or View and choose the Person table. 16. In the Mapping Details window, add a condition for the Instructor entity When Role = Instructor. This maps the Instructor entity when the Role is Instructor. At this point, we have the inheritance hierarchy in place with all the entities. We have marked Person and Staff as abstract because we will never create them directly. We have not yet mapped the properties of the Principal or the Instructor entities. This is not supported by the designer, so we need to make some minor changes to the .edmx file. 17. Right-click the .edmx file in the Solution Explorer and select Open With XML Editor. This will close the designer and open the .edmx file in the XML editor. 18. Add the HireDate and Salary mappings to both the Principal and Instructor entities. The XML in Listing 15-9 highlights the required changes. Listing 15-9. Mapping the HireDate and Salary properties in the Principal and Instructor entities <EntityContainerMapping StorageEntityContainer="EFRecipesModelStoreContainer" CdmEntityContainer="EFRecipesEntities"> <EntitySetMapping Name="People"> <EntityTypeMapping TypeName="IsTypeOf(EFRecipesModel.Person)"> <MappingFragment StoreEntitySet="Person"> <ScalarProperty Name="PersonId" ColumnName="PersonId" /> <ScalarProperty Name="Name" ColumnName="Name"/> </MappingFragment> </EntityTypeMapping> <EntityTypeMapping TypeName="IsTypeOf(EFRecipesModel.Student)"> <MappingFragment StoreEntitySet="Person"> <ScalarProperty Name="PersonId" ColumnName="PersonId" /> <ScalarProperty Name="EnrollmentDate" ColumnName="EnrollmentDate" /> <Condition ColumnName="Role" Value="Student" /> </MappingFragment> </EntityTypeMapping> <EntityTypeMapping TypeName="IsTypeOf(EFRecipesModel.Principal)"> <MappingFragment StoreEntitySet="Person" > <ScalarProperty Name="PersonId" ColumnName="PersonId"/> <ScalarProperty Name="HireDate" ColumnName="HireDate"/> <ScalarProperty Name="Salary" ColumnName="Salary"/> <Condition ColumnName="Role" Value="Principal" /> </MappingFragment> </EntityTypeMapping> <EntityTypeMapping TypeName="IsTypeOf(EFRecipesModel.Instructor)"> <MappingFragment StoreEntitySet="Person" > <ScalarProperty Name="PersonId" ColumnName="PersonId"/>
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<ScalarProperty Name="HireDate" ColumnName="HireDate"/> <ScalarProperty Name="Salary" ColumnName="Salary"/> <Condition ColumnName="Role" Value="Instructor" /> </MappingFragment> </EntityTypeMapping> </EntitySetMapping> </EntityContainerMapping> The resulting model is shown in Figure 15-8.
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Figure 15-8. The model with the Staff entity added to the hierarchy
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We added the Staff entity that introduced a new level in the inheritance hierarchy. This allows us to better organize the hierarchy and simplify the programming because the Staff entity contains all the properties shared among the Principal and Instructor entities. This modeling scenario is not directly supported by the designer. We had to make some minor changes (as shown in Listing 15-9) to the .edmx file to map the properties of the Principal and Instructor entities. The code in Listing 15-10 demonstrates inserting into and retrieving from our model.
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Listing 15-10. Inserting into and retrieving from our model using (var context = new EFRecipesEntities()) { var p = new Principal { Name = "Jill Robins", HireDate = DateTime.Parse("8/12/2002"), Salary = 72500M }; var i1 = new Instructor { Name = "Roland Jones", HireDate = DateTime.Parse("8/14/2005"), Salary = 61000M}; var i2 = new Instructor { Name = "Steven Curtis", HireDate = DateTime.Parse("8/23/1992"), Salary = 68200M }; context.People.AddObject(new Student { Name = "Karen Roberts" }); context.People.AddObject(new Student {Name = "Bobby McGivens"}); context.People.AddObject(new Student {Name = "Janis Hettler"}); context.People.AddObject(p); context.People.AddObject(i1); context.People.AddObject(i2); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { Console.WriteLine("Staff"); Console.WriteLine("====="); foreach (var staff in context.People.OfType<Staff>()) { Console.WriteLine("\t{0}, Hire date: {1}, Salary: {2} {3})", staff.Name, staff.HireDate.Value.ToShortDateString(), staff.Salary.Value.ToString("C"), staff is Principal "Principal" : "Instructor"); } Console.WriteLine("\nStudents"); Console.WriteLine("=========="); foreach (var student in context.People.OfType<Student>()) { Console.WriteLine("\t{0}", student.Name); } } The output from the code in Listing 15-10 is the following: Staff ===== Jill Robins, Hire date: 8/12/2002, Salary: $72,500.00 Principal)
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