Creating EF Entities in Visual Basic .NET

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Creating EF Entities
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Now that you have a database connection, you need to create the EF classes: 1. 2. 3. 4. 5. 6. 7. 8. Right-click the Models directory and select Add New Item. Select ADO.NET entity data model (under the Data tab) and call the file BobsMovies.edmx. Select Generate from database. Select the connection you created earlier or enter new connection details. Check the Tables box to add all the tables to the application. Set the model namespace as 13.BoxMoviesMVC.Model. Open BobsMovies.designer.cs. By default, Visual Studio will generate a context class with the same name as the example database. Expand the region where it says Contexts and rename the existing context class and its constructors to TheatreEntities.
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Repository Pattern
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When you query the model, you are using EF, which accesses the database. This can pose an issue if you want to write unit tests because you have to ensure that the database is set up the same each time. Querying a database can also slow down large unit tests. An alternative is to use a repository pattern. For more information, please refer to http://martinfowler.com/eaaCatalog/repository.html. The repository pattern allows you to use a technique called dependecy injection that allows you to give it a different mechanism to retrieve data.
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NOTE For more information on patterns I highly recommend the very readable Head First Design Patterns by Eric and Elisabeth Freeman et al., published by O Reilly.
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Let's see this in action. 1. Right-click the Models folder and select Add New Item enter the following code: namespace 13.BobsMoviesMVC.Models { public interface IFilmRepository { bool Add(Film film); void Delete(int ID); IEnumerable<Film> GetAll(); Film GetFilm(int ID); void Save(); bool Update(Film film); } } 2. Add another class called FilmRepository and add the following code: using using using using System; System.Collections.Generic; System.Linq; System.Web; Class. Call the class IFilmRepository and
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namespace 13.BobsMoviesMVC.Models { public class FilmRepository : BobsMoviesMVC.Models.IFilmRepository { private BobsMoviesMVC.Models.TheatreEntities dbContext = new BobsMoviesMVC.Models.TheatreEntities(); public IEnumerable<Film> GetAll() { return dbContext.Films; } public Film GetFilm(int ID) { return dbContext.Films.Single(f => f.FilmID == ID); } public bool Add(Film film) { if (film.GetErrors().Count == 0) {
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dbContext.Films.AddObject(film); Save(); return true; } else { return false; } } public bool Update(Film film) { if (film.GetErrors().Count == 0) { var ExistingFilm = dbContext.Films.Single(f => f.FilmID == film.FilmID); ExistingFilm.Title = film.Title; ExistingFilm.Description = film.Description; ExistingFilm.Length = film.Length; Save(); return true; } else { return false; } } public void Delete(int ID) { dbContext.Films.DeleteObject(dbContext.Films.Single(f => f.FilmID == ID)); Save(); } public void Save() { dbContext.SaveChanges(); } } }
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Creating Validation for Data Model
Usually you will want to validate data before saving it back to the database (or you should). In this simple example, you will want to ensure that film entries have a title before inserting them into the database. One method of creating validation rules, as suggested in Wrox s Professional ASP.NET MVC, is using partial classes (an excellent ASP.NET MVC introduction). You will utilize a very similar method to that suggested in the book as it is easy to understand and very effective.
ASP.NET MVC
1. 2.
Right-click Models directory, select Add New Item Enter the following code: public class Error { public string Description { get; set; } public string Property { get; set; } }
Class, and call it Error.cs.
3. 4.
You now want to utilize this in the Film class. Right-click Models directory, select Add New Item Class, and call it Film.cs. Enter the following code: using using using using System; System.Collections.Generic; System.Linq; System.Web;
namespace 13.BobsMoviesMVC.Models { public partial class Film { public bool IsValid() { if (this.GetErrors().Count == 0) { return true; } else { return false; } } public List<Error> GetErrors() { List<Error> Errors = new List<Error>(); if (String.IsNullOrEmpty(this.Title)) { Errors.Add( new Error { Description = "Title cannot be blank", Property = "Title" }); } return Errors; } } }
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