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ADO.NET Entity Framework : Working with Stored Procedure


Here we go, I generally get questions from developers that if they will have to scrub the existing powerful stored procedure they have written by investing time and money. The answer to that is “NO”. You must enjoy using it as it has its own power.


 


So it is very simple in ADO.NET Entity Framework. Little bit of background before we start,


 


We need a table


 


CREATE TABLE [dbo].[Emp](


      [Id] [int] IDENTITY(1,1) NOT NULL,


      [Name] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,


 CONSTRAINT [PK_Emp] PRIMARY KEY CLUSTERED


(


      [Id] ASC


)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]


) ON [PRIMARY]


 


There will be three stored procedures, insert/update/delete


 


Insert


++++


ALTER PROCEDURE [dbo].[InsertEmp]  


(


            @Name VARCHAR(50)


)    


AS


BEGIN


      INSERT INTO Emp(Name) VALUES(@Name)


END  


 


Update


+++++


ALTER PROCEDURE [dbo].[UpdateEmp]


(


      @Id int,


      @Name VARCHAR(50)


)    


AS


      UPDATE Emp SET [Name] = @Name WHERE ID = @Id


      RETURN


 


Delete


++++


ALTER PROCEDURE [dbo].[DeleteEmp]


(


      @Id int


)


     


AS


      DELETE Emp WHERE ID = @Id


 


 


Now the story begins, you create your apps in Visual Studio 2008 (any kind). And add edmx to it. While creating the model select the stored procedures and table you will be working with.


 


So your final edmx would look like,


 


image


EDMX

 



 


image


Model Browser

After that you right click on the edm designer and choose “Mapping Details”. In that you choose “Map Entity to Functions” then put the required stored procedures. You are done.


 


image


Stored Procedure mapping



Now if you are observing the SQL Profiler you would be able to see that the stored procedures are getting executed instead of your T-SQL.



I am planning to create a screen capture, when ready I will add that to this blog.



Namoskar!!!