Usando el entity framework
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The document discusses using Entity Framework for an ASP.NET MVC application. It describes creating POCO entity classes for students, courses, and enrollments and defining their relationships. It then shows initializing a database context and seeding it with test data. Controllers and views are created to display and manage student data. The Entity Framework conventions for naming tables, columns and primary keys are also covered.
Usando el entity framework
- 1. USANDO EL ENTITY FRAMEWORK Juan Camilo Sacanamboy
- 2. ENTITY FRAMEWORK Fuente: MSDN (Working with Data in ASP.NET MVC 3)
- 3. ENTITY FRAMEWORK Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 4. CONTOSO UNIVERSITY Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 5. CONTOSO UNIVERSITY Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 6. CONTOSO UNIVERSITY Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 7. POCO • Plain Old CLR Objects • POCO Class Persistence ignorance • Design – Build – Test – Independently of • Database • Persistence infrastructure code • Focus on the business problem Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 8. DATA MODEL Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 9. STUDENT ENTITY Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 10. ENROLLMENT ENTITY Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 11. COURSE ENTITY Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 12. DATABASE CONTEXT Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 13. CONNECTION STRING • SQL Server Compact <add name="SchoolContext" connectionString="Data Source=|DataDirectory|School.sdf" providerName="System.Data.SqlServerCe.4.0"/> Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 14. Initializing the Database with test data • using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Data.Entity; using ContosoUniversity.Models; namespace ContosoUniversity.DAL { public class SchoolInitializer : DropCreateDatabaseIfModelChanges<SchoolContext> { protected override void Seed(SchoolContext context) { var students = new List<Student> { new Student { FirstMidName = "Carson", LastName = "Alexander", EnrollmentDate = DateTime.Parse("2005-09-01") }, new Student { FirstMidName = "Meredith", LastName = "Alonso", EnrollmentDate = DateTime.Parse("2002-09-01") }, new Student { FirstMidName = "Arturo", LastName = "Anand", EnrollmentDate = DateTime.Parse("2003-09-01") }, new Student { FirstMidName = "Gytis", LastName = "Barzdukas", EnrollmentDate = DateTime.Parse("2002-09-01") }, new Student { FirstMidName = "Yan", LastName = "Li", EnrollmentDate = DateTime.Parse("2002-09-01") }, new Student { FirstMidName = "Peggy", LastName = "Justice", EnrollmentDate = DateTime.Parse("2001-09-01") }, new Student { FirstMidName = "Laura", LastName = "Norman", EnrollmentDate = DateTime.Parse("2003-09-01") }, new Student { FirstMidName = "Nino", LastName = "Olivetto", EnrollmentDate = DateTime.Parse("2005-09-01") } }; students.ForEach(s => context.Students.Add(s)); context.SaveChanges(); Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 15. Initializing the Database with test data • var courses = new List<Course> { new Course { Title = "Chemistry", Credits = 3, }, new Course { Title = "Microeconomics", Credits = 3, }, new Course { Title = "Macroeconomics", Credits = 3, }, new Course { Title = "Calculus", Credits = 4, }, new Course { Title = "Trigonometry", Credits = 4, }, new Course { Title = "Composition", Credits = 3, }, new Course { Title = "Literature", Credits = 4, } }; courses.ForEach(s => context.Courses.Add(s)); context.SaveChanges(); var enrollments = new List<Enrollment> { new Enrollment { StudentID = 1, CourseID = 1, Grade = 1 }, new Enrollment { StudentID = 1, CourseID = 2, Grade = 3 }, new Enrollment { StudentID = 1, CourseID = 3, Grade = 1 }, new Enrollment { StudentID = 2, CourseID = 4, Grade = 2 }, new Enrollment { StudentID = 2, CourseID = 5, Grade = 4 }, new Enrollment { StudentID = 2, CourseID = 6, Grade = 4 }, new Enrollment { StudentID = 3, CourseID = 1 }, new Enrollment { StudentID = 4, CourseID = 1, }, new Enrollment { StudentID = 4, CourseID = 2, Grade = 4 }, new Enrollment { StudentID = 5, CourseID = 3, Grade = 3 }, new Enrollment { StudentID = 6, CourseID = 4 }, new Enrollment { StudentID = 7, CourseID = 5, Grade = 2 }, }; enrollments.ForEach(s => context.Enrollments.Add(s)); context.SaveChanges(); } } } Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 16. Global.asax.cs Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 17. Creating a Student Controller Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 18. StudentController.cs Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 19. ViewsStudentIndex.cshtml • @model IEnumerable<ContosoUniversity.Models.Student> @{ ViewBag.Title = "Students"; } <h2>Students</h2> <p> @Html.ActionLink("Create New", "Create") </p> <table> <tr> <th></th> <th>Last Name</th> <th>First Name</th> <th>Enrollment Date</th> </tr> Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 20. ViewsStudentIndex.cshtml • @foreach (var item in Model) { <tr> <td> @Html.ActionLink("Edit", "Edit", new { id=item.StudentID }) | @Html.ActionLink("Details", "Details", new { id=item.StudentID }) | @Html.ActionLink("Delete", "Delete", new { id=item.StudentID }) </td> <td> @Html.DisplayFor(modelItem => item.LastName) </td> <td> @Html.DisplayFor(modelItem => item.FirstMidName) </td> <td> @Html.DisplayFor(modelItem => item.EnrollmentDate) </td> </tr> } </table> Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 21. Running application Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 22. Solution Explorer Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 23. Solution Explorer Fuente: MSDN (Creating an Entity Framework Data Model for an ASP.NET MVC Application)
- 24. Conventions • Los nombres de las entidades en plural son los nombres de las tablas. • Los nombres de las propiedades de las entidades son las columnas de las tablas. • Las propiedades llamadas ID o *ID son reconocidas como claves primarias. • El EF se conecta a la base de datos buscando un string de conexión que tenga el mismo nombre de la clase contexto. (SchoolContext)