How to call Stored Procedure in Entity Framework 6

Question

I am very new to Entity Framework 6 and I want to implement stored procedures in my project. I have a stored procedure as follows:

ALTER PROCEDURE [dbo].[insert_department]
    @Name [varchar](100)
AS
BEGIN
    INSERT [dbo].[Departments]([Name])
    VALUES (@Name)

    DECLARE @DeptId int

    SELECT @DeptId = [DeptId]
    FROM [dbo].[Departments]
    WHERE @@ROWCOUNT > 0 AND [DeptId] = SCOPE_IDENTITY()

    SELECT t0.[DeptId]
    FROM [dbo].[Departments] AS t0
    WHERE @@ROWCOUNT > 0 AND t0.[DeptId] = @DeptId
END

Department class:

public class Department
{
    public int DepartmentId { get; set; }       
    public string Name { get; set; }
}

modelBuilder 
.Entity<Department>() 
.MapToStoredProcedures(s => 
s.Update(u => u.HasName("modify_department") 
               .Parameter(b => b.Department, "department_id") 
               .Parameter(b => b.Name, "department_name")) 
 .Delete(d => d.HasName("delete_department") 
               .Parameter(b => b.DepartmentId, "department_id")) 
 .Insert(i => i.HasName("insert_department") 
               .Parameter(b => b.Name, "department_name")));

protected void btnSave_Click(object sender, EventArgs e)
{
    string department = txtDepartment.text.trim();

    // here I want to call the stored procedure to insert values
}

My problem is: how can I call the stored procedure and pass parameters into it?

Answer 1

When EDMX create this time if you select stored procedured in table select option then just call store procedured using procedured name...

var num1 = 1; 
var num2 = 2; 

var result = context.proc_name(num1,num2).tolist();// list or single you get here.. using same thing you can call insert,update or delete procedured.

Answer 2

This is what EF (DB first) generates in the DbContext class:

public ObjectResult<int> Insert_Department(string department)
{
    var departmentParameter = new ObjectParameter("department", department);

    return ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction<int>("insert_department", departmentParameter);
}

Answer 3

You can call a stored procedure in your DbContext class as follows.

this.Database.SqlQuery<YourEntityType>("storedProcedureName",params);

But if your stored procedure returns multiple result sets as your sample code, then you can see this helpful article on MSDN

Stored Procedures with Multiple Result Sets

Answer 4

All you have to do is create an object that has the same property names as the results returned by the stored procedure. For the following stored procedure:

    CREATE PROCEDURE [dbo].[GetResultsForCampaign]  
    @ClientId int   
    AS
    BEGIN
    SET NOCOUNT ON;

    SELECT AgeGroup, Gender, Payout
    FROM IntegrationResult
    WHERE ClientId = @ClientId
    END

create a class that looks like:

    public class ResultForCampaign
    {
        public string AgeGroup { get; set; }

        public string Gender { get; set; }

        public decimal Payout { get; set; }
    }

and then call the procedure by doing the following:

    using(var context = new DatabaseContext())
    {
            var clientIdParameter = new SqlParameter("@ClientId", 4);

            var result = context.Database
                .SqlQuery<ResultForCampaign>("GetResultsForCampaign @ClientId", clientIdParameter)
                .ToList();
    }

The result will contain a list of ResultForCampaign objects. You can call SqlQuery using as many parameters as needed.

Answer 5

I solved it with ExecuteSqlCommand

Put your own method like mine in DbContext as your own instances:

public void addmessage(<yourEntity> _msg)
{
    var date = new SqlParameter("@date", _msg.MDate);
    var subject = new SqlParameter("@subject", _msg.MSubject);
    var body = new SqlParameter("@body", _msg.MBody);
    var fid = new SqlParameter("@fid", _msg.FID);
    this.Database.ExecuteSqlCommand("exec messageinsert @Date , @Subject , @Body , @Fid", date,subject,body,fid);
}

so you can have a method in your code-behind like this :

[WebMethod] //this method is static and i use web method because i call this method from client side
public static void AddMessage(string Date, string Subject, string Body, string Follower, string Department)
{
    int resault;
    try
    {
        using (DBContex reposit = new DBContex())
        {
            msge <yourEntity> Newmsg = new msge();
            Newmsg.MDate = Date;
            Newmsg.MSubject = Subject.Trim();
            Newmsg.MBody = Body.Trim();
            Newmsg.FID= 5;
            reposit.addmessage(Newmsg);
        }
    }
    catch (Exception)
    {
        throw;
    }
}

this is my SP :

Create PROCEDURE dbo.MessageInsert

    @Date nchar["size"],
    @Subject nchar["size"],
    @Body nchar["size"],
    @Fid int
AS
    insert into Msg (MDate,MSubject,MBody,FID) values (@Date,@Subject,@Body,@Fid)
    RETURN

hope helped you

Answer 6

You can now also use a convention I created which enables invoking stored procedures (including stored procedures returning multiple resultsets), TVFs and scalar UDFs natively from EF.

Until Entity Framework 6.1 was released store functions (i.e. Table Valued Functions and Stored Procedures) could be used in EF only when doing Database First. There were some workarounds which made it possible to invoke store functions in Code First apps but you still could not use TVFs in Linq queries which was one of the biggest limitations. In EF 6.1 the mapping API was made public which (along with some additional tweaks) made it possible to use store functions in your Code First apps.

Read more

I pushed quite hard for the past two weeks and here it is – the beta version of the convention that enables using store functions (i.e. stored procedures, table valued functions etc.) in applications that use Code First approach and Entity Framework 6.1.1 (or newer). I am more than happy with the fixes and new features that are included in this release.

Read more.