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using output parameter in stored procedure

Posted on 2014-02-13
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Last Modified: 2014-02-14
I am probably missing something very basic. I have a 'main' stored procedure that calls several other stored procedures, each of which do inserts and updates to various tables.

I want to add some logic to each subsidiary procedure to output some result information to the main procedure and I don't want to be limited to an integer. An Output Parameter seems to make sense but I have not been able to make it work.

Attached is a very simple example of what I want to be able to do with one trivial stored procedure calling another one that has an output parameter.

Here's all the code

CREATE PROCEDURE [dbo].[ProcWithOutput]
  @ValueA nvarchar(100), @ValueB nvarchar(100), @OutParam nvarchar(10) OUTPUT
AS
BEGIN
      IF @ValueA = @ValueB BEGIN
            SET @OutParam = 'Good'
      END
      ELSE BEGIN
            SET @OutParam = 'Bad'
      END
END
GO

CREATE PROCEDURE [dbo].[CallProcWithOutput]
AS
BEGIN
DECLARE      @return_value int
DECLARE @A nvarchar(100) = 'Boston'
DECLARE @B nvarchar(100) = 'New York'
DECLARE @TxtResult nvarchar(10) = NULL
      EXEC @return_value = [dbo].[ProcWithOutput] @A, @B, @TxtResult
      SELECT @TxtResult AS ResponseFromProcWithOutput
END
GO

DECLARE      @return_value int
EXEC      @return_value = [dbo].[CallProcWithOutput]
SELECT      'Return Value' = @return_value
GO

/*
DROP PROCEDURE ProcWithOutput
DROP PROCEDURE CallProcWithOutput
*/

The result I actually get from the SELECT statement is NULL
SPResult.JPG
Output-example-to-Experts-Exchan.sql
0
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Question by:Douglass MacLean
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3 Comments
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 2000 total points
ID: 39858352
change this line to append OUTPUT keyword, that will then work
EXEC @return_value = [dbo].[ProcWithOutput] @A, @B, @TxtResult OUTPUT
0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 39858354
just a note:
 SELECT @TxtResult AS ResponseFromProcWithOutput

this will NOT assign the value to the @return_value !!!
first the return value can only be INT as data type, and to assign a value there, it would have to be
RETURN <something>
and not SELECT <something> ...

hope this clarifies
0
 

Author Closing Comment

by:Douglass MacLean
ID: 39858415
Thanks much. Nice clean, simple solution.
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