Using stored procedures with Entity Framework 4 Co

I am using Entity Framework 4 Code First CTP5 and ASP.NET MVC 3. I would like to know how do I make use of stored procedures?

I have the following code in my respository class:

MyDatabaseContext db = new MyDatabaseContext();

public void Insert(News news)
{
   db.Newses.Add(news);
   db.SaveChanges();
}

And then my insert store procedure will look like this:

ALTER PROCEDURE [dbo].[News_Insert]
(
   @Title VARCHAR(100),
   @Body VARCHAR(MAX),
   @NewsStatusId INT
)

AS

BEGIN

   INSERT INTO
      News
      (
         Title,
         Body,
         NewsStatusId
      )
      VALUES
      (
         @Title,
         @Body,
         @NewsStatusId
      );

  SELECT SCOPE_IDENTITY();

END

Any articles/advice would be appreciated.

UPDATE 1:

With the designer I could return the new object or news ID, how would I do this here?

UPDATE 2

This is what I did:

public void Insert(News news)
{
   int newsId = context.Database.SqlQuery<int>("News_Insert @Title, @Body, @Active",
      new SqlParameter("Title", news.Title),
      new SqlParameter("Body", news.Body),
      new SqlParameter("Active", news.Active)
   ).FirstOrDefault();

   context.SaveChanges();
}

I get an error here saying:

The specified cast from a materialized 'System.Decimal' type to the 'System.Int32' type is not valid.

My News class:

public class News
{
   public int NewsId { get; set; }
   public string Title { get; set; }
   public string Body { get; set; }
   public bool Active { get; set; }
}

I am using an existing database and my connection string looks like this:

<connectionStrings>
   <add
      name="MyDatabaseContext"
      connectionString="Data Source=MyServer;Initial Catalog=MyDatabase;Integrated Security=True;"
      providerName="System.Data.SqlClient" />
</connectionStrings>

Here is my context class:

public class MyDatabaseContext : DbContext
{
   public DbSet<News> Newses { get; set; }
}

I'm not sure what I am doing wrong here? Is my stored procedure maybe incorrect? Ideally I would like to return the new updated object. Can someone please advise?

回答1:

There is no direct mapping support for stored procedures (as known from EDMX). You can simply call your procedure instead of Add method by using db.Database.SqlCommand method. Try this:

db.Database.SqlCommand("dbo.News_Insert @Title, @Body, @NewsStatusId",
  new SqlParameter("Title", news.Title),
  new SqlParameter("Body", news.Body),
  new SqlParameter("NewsStatusId", news.NewStatus.Id));

回答2:

you can write stored procedures in sql and your entity update and then conversion it to function and use it such as function in your program,db-click on the Entity Model and in open page(EntityModel) then i right side page db-click on folder that called StoredproceduresEntity and open then right click on the a StoredProcedures and select option AddFunction... then select type of output go to: http://msdn.microsoft.com/en-us/data/gg699321.aspx