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LINQ, Stored Procedures and Multiple Recordsets

By juliana | May 15, 2008

Update: This post has a follow up here: LINQ, Stored Procedures and Multiple Recordsets: How-To

I wanted to use a LINQ with a stored procedure that would return multiple recordsets, like this:

--first set
SELECT value1 FROM table1

--second set
SELECT t1.value1, t2.value2
FROM table1 t1 LEFT JOIN
table2 t2 on t1.value1 = t2.value2


I found ScottGu’s LINQ to SQL (Part 6 – Retrieving Data Using Stored Procedures) article and Guy Burstein’s Linq to SQL Stored Procedures with Multiple Results – IMultipleResults article that pointed me into the right direction, but not QUITE all the way.

ScottGu’s article showed how you can use a SPROC to return different types of recordset (usually due to an IF statement within the SPROC) and how IMultipleResults were used; in the comment trail someone asks about multiple tables and ScottGu said it could be done in the same way, calling GetResult twice. Burstein’s article showed exactly how you did this. My problem was that the stored procedures returned TABLES. However, my results are based on my own SELECT statements, so there was a little bit of extra that had to be done.

HOW TO (overview):

  1. Create the multiple recordset stored procedure
  2. Drag the stored procedure into the DBML. Note, this will create the functions and classes for retrieving the first recordset.
  3. For each recordset, create the partial class needed based on the columns returned. Use the first recordset’s class as a guide.
  4. Now that you’ve got all your recordset classes, convert the function for the stored procedure into IMultipleResults
  5. In the application layer, call the stored procedure and use GetResults (and the recordset class) to access the multiple results.Self-note: had to convert the results ToList() in order to use it/iterate later,etc.

I’ll come back here and illustrate each step later. Need to finish up that page now that I’ve got access to my multiple results!

Click on pen to Use a Highlighter on this page

Topics: I Canz Code! | 29 Comments »

29 Responses to “LINQ, Stored Procedures and Multiple Recordsets”

  1. LINQ Stored Procedures and Multiple Recordsets two geeks | Paid Surveys Says:
    June 4th, 2009 at 4:28 am

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  2. Mazhar Karimi Says:
    June 5th, 2009 at 3:20 pm

    Right, but when the resultset is empty, converting to toList() throws an exception, so need to check it first.

    I think there is a problem with dbml, if you create a stored procedure returning multiple results, but you also do some logics before returning them, for example declaring a variable of some type (Note: you are not returning that variable, it is being used internally). But when you will drop that SP into the dbml Designer, dbml will create ISingleResult with the compatible type of that variable which you created in that SP.

    I solved that problem by opening dbm into XML editor, manually addming multiple elements. and saved it. Now when I opened dbml again in visual studio, it automatically created addition classes in designer.cs(with the same elements names which i created), and change the ISingleResult with IMultipleResult.

  3. dcolumbus Says:
    November 25th, 2010 at 6:01 pm

    I’d really like to see an example of this… I’m currently fighting with the face that the generated code only handles one resultset. I have multiple resultsets and need to work with that information WITHOUT having tables in the design view. Just simply calling the stored procedure and displaying the results.

  4. juliana Says:
    November 25th, 2010 at 6:34 pm

    Hi dcolumbus, you could check out the follow-up post at where I expand (with some examples) on this method. Hope it helps!

  5. Tom Says:
    May 17th, 2011 at 9:13 pm

    Try this instead:

    You can include it in the project build process and things go swimmingly – hopefully!

  6. ankit nandekar Says:
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    sir can you please tell what will be the coding when we are using join query in store procedure.

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