How to use temp table in Stored Procedure with LINQ to SQL

Question

I use a temp table in a Stored Procedure with LINQ to SQL. I add the stored procedure to Linq to SQL dbml file then project occur error message

"Unknown Return Type - The return types for the following stored procedures could not be detected.”

When I delete a temp table in a stored procedure then return value is fine.

How can I use a temp table in a stored procedure with Linq to SQL

I replace the temptable like this

  CREATE TABLE tempTable(
PartsReceivingID INT, 
SoPartID INT,
RecvQty INT,
ReturnQty INT
)

Replace like below

  SELECT @RowCount = count(*)           
  FROM Parts.studentTempTable          
   IF @RowCount > 0         
           BEGIN             
             TRUNCATE TABLE Parts.studentTempTable;
           END  

Working version stored procedure

ALTER  PROCEDURE [dbo].[stp_student_Select_New] 
                @pSchID as int, 
                @pCompanyID as int,
                @pAgingDate as int,
                @pTicketNo as VARCHAR(50),
                @pInvoiceNo as VARCHAR(50),
                @pDeliveryNo as VARCHAR(50),
                @pPartNo as VARCHAR(50)
As
SET NOCOUNT ON
BEGIN
          SELECT @RowCount = count(*)
          FROM Parts.studentTempTable

        IF @RowCount > 0
        BEGIN
            TRUNCATE TABLE Parts.studentTempTable;
        END


    ===============================================
    do something with studentTempTable
    ===============================================

        SELECT 
               r.Ticketid AS TicketID,
               r.SoPartNo  AS PartNo ,
               p.Description,
               r.InvoiceNo as InvoiceNo,
               r.InvoiceDate AS InvoiceDate,
               DATEDIFF(DY,r.InvoiceDate,GETDATE())as Aging,
               r.Qty AS CurrentInventory,              
               t.ReturnQty AS ReturnQty
        FROM Parts.studentTempTable AS t,
             Parts.PartsReceiving AS r,
             Parts.PartsInfo as p
        WHERE t.PartsReceivingID = r.PartsReceivingID
          --and i.TicketID = r.TicketID 
          and p.PartID = r.SoPartID  
          and t.ReturnQty >0 
          and DATEDIFF(DY,r.InvoiceDate,GETDATE()) > @pAgingDate
          and r.SchID = @pSchID 
          and r.CompanyID = @pCompanyID
          and r.SoPartNo like  '%%' + @pTicketNo + '%' 
          and r.InvoiceNo like  '%%' + @pInvoiceNo + '%' 
          and r.SoPartNo like  '%%' + @pPartNo + '%' 
          --and i.TicketNo like  '%%' + @pTicketNo + '%' 
          --and r.DeliverNo like  '%%' + @pDeliveryNo + '%' 
Return
END

None Working version stored procedure

ALTER PROCEDURE [dbo].[stp_student_Select] 
                @pVendorID as int, 
                @pCompanyID as int,
                @pAgingDate as int,
                @pTicketNo as VARCHAR(50),
                @pInvoiceNo as VARCHAR(50),
                @pDeliveryNo as VARCHAR(50),
                @pPartNo as VARCHAR(50)

As
SET NOCOUNT ON
BEGIN
    BEGIN TRY


            CREATE TABLE tempTable(
                    PartsReceivingID INT, 
                    SoPartID INT,
                    RecvQty INT,
                    ReturnQty INT
                    )
    ===============================================
    do something with tempTable
    ===============================================
        SELECT 
               isnull(r.Ticketid,0) AS TicketID,
               --i.TicketNo,
               r.SoPartNo  AS PartNo ,
               p.Description,
               r.InvoiceNo as InvoiceNo,
               --r.DeliveryNo,
               r.InvoiceDate AS InvoiceDate,
               DATEDIFF(DY,r.InvoiceDate,GETDATE())as Aging,
               r.Qty AS CurrentInventory,              
               t.ReturnQty AS ReturnQty

        FROM tempTable AS t,
             Parts.PartsReceiving AS r,
             --Ticket.TicketInfo as i,
             Parts.PartsInfo as p

        WHERE t.PartsReceivingID = r.PartsReceivingID
          --and i.TicketID = r.TicketID 
          and p.PartID = r.SoPartID  
          and t.ReturnQty >0 
          and DATEDIFF(DY,r.InvoiceDate,GETDATE()) > @pAgingDate
          and r.VendorID = @pVendorID 
          and r.CompanyID = @pCompanyID
          and r.SoPartNo like  '%%' + @pTicketNo + '%' 
          and r.InvoiceNo like  '%%' + @pInvoiceNo + '%' 
          and r.SoPartNo like  '%%' + @pPartNo + '%' 
          --and i.TicketNo like  '%%' + @pTicketNo + '%' 
          --and r.DeliverNo like  '%%' + @pDeliveryNo + '%' 


        DROP TABLE temptable
    END TRY

    BEGIN CATCH
        SELECT ERROR_MESSAGE() as ErrorMessge,
               ERROR_NUMBER() AS ErrorNumber
    END CATCH
Return
END

Answer 1

If you run the procedure by itself (in SSMS, or Visual Studio) does it return results? Regardless of the answer, I would suggest you use a table variable - what you are currently using is not a temp table - it is just a table. Using a table variable will rule out any issues with actually creating/dropping the table. Googling will find you plenty of information, but this seems to be pretty informative: http://odetocode.com/code/365.aspx