Return Output Param of a Stored Procedure inside a

问题:

I'm trying to find out how to return the output parameter of a stored procedure when executing the stored procedure inside another stored procedure:

 CREATE PROCEDURE Test1

 EXEC SpWithOutputID -- Outputs @ID

 SELECT @ID as ID -- Output @ID now being used in this SP

This is of course not my code, but just an example, is it possible to do this?

Example 2: --Here @ID returns Null

 CREATE PROCEDURE Test1
 As 
 DECLARE @ID int

 EXEC SpWithOutputID @ID = @ID OUTPUT -- Outputs @ID

 SELECT @ID as ID -- Output @ID now being used in this SP

Example 3: --Here @ID returns an Int

 CREATE PROCEDURE Test1
 As 

 EXEC SpWithOutputID -- Outputs @ID

回答1:

If this isn't really an output parameter issue at all, but rather a result set, then taking a guess that SpWithOutputID does something like this (returns a SELECT with a single row and single column):

CREATE PROCEDURE dbo.SpWithOutputID
AS
BEGIN
    SET NOCOUNT ON;

    SELECT ID = 4;
END
GO

Then Test1 could look like this:

CREATE PROCEDURE dbo.Test1
AS
BEGIN
    SET NOCOUNT ON;

    DECLARE @ID INT;

    CREATE TABLE #x(ID INT);

    INSERT #x EXEC dbo.SpWithOutputID;

    SELECT TOP (1) @ID = ID FROM #x;

    DROP TABLE #x;
END
GO

---

---

But doesn't that look really messy to you? It really should work this way for single, scalar values:

CREATE PROCEDURE dbo.SpWithOutputID
    @ID INT OUTPUT 
AS
BEGIN
    SET NOCOUNT ON;

    SELECT @ID = 4; 
END 
GO

Now it is much simpler to consume what is really an output parameter now:

CREATE PROCEDURE dbo.Test1
AS
BEGIN
    SET NOCOUNT ON;
    DECLARE @ID INT;

    EXEC dbo.SpWithOutputID @ID = @ID OUTPUT;

    SELECT @ID;
END
GO