Getting output of one Stored Procedure called in another using TSQL - tsql

Question

I have two stored procedures spParent and spParentChild. spParent calls spParentChild. Following the SPs:
CREATE PROCEDURE [dbo].[spParent]
#isApproved varchar(max) = 'TEST',
#ApplicationDBName varchar(100) = 'secDB',
#ApplicationInsertSPName varchar(100) = 'spParentChild',
#resultP varchar(max) output
AS
BEGIN
BEGIN TRY
SET NOCOUNT ON;
IF #resultP <> ''
BEGIN
RAISERROR('An error occurred in the parent SP.', 18, 0)
END
DECLare #resultCC varchar(max)
DECLARE #SP_Call Varchar(MAX)
SET #SP_Call = 'exec spParentChild ''1'', #resultCC output'
EXEC #SP_Call
select #resultCC
END TRY
BEGIN CATCH
Declare #ErrMessage Varchar(max)
Declare #ErrState Varchar(max)
Declare #ErrLine Varchar(max)
select #ErrMessage=ErrorMessage, #ErrLine=ErrorLine, #ErrState=ErrorState from fnGetError()
IF #ErrMessage is not Null
BEGIN
SELECT #resultP = #ErrMessage
SELECT #resultCC
END
ELSE
BEGIN
SELECT #resultP = 'An unknown error occurred.'
raiserror(#resultP,18,0)
END
END CATCH
END
CREATE PROCEDURE [dbo].[spParentChild]
#isApproved varchar(max) = 'TEST',
#resultC varchar(max) output
AS
BEGIN
BEGIN TRY
SET NOCOUNT ON;
RAISERROR('An error occurred in the child SP.', 18, 0)
END TRY
BEGIN CATCH
Declare #ErrMessage Varchar(max)
Declare #ErrState Varchar(max)
Declare #ErrLine Varchar(max)
select #ErrMessage=ErrorMessage, #ErrLine=ErrorLine, #ErrState=ErrorState from fnGetError()
IF #ErrMessage is not Null
BEGIN
SET #resultC = #ErrMessage
END
ELSE
BEGIN
SELECT #resultC = 'An unknown error occurred.'
END
END CATCH
END
As you can see spParent calls spParentChild. What I am needing is to use TSQL for the call, but it does not work. If I use the following all works fine, but I need TSQL:
EXEC spParentChild 1, #resultCC output
Can anyone help me in seeing what I am doing wrong or if this is even possible at all?
Thank you in advance.
Godfrey

Answer 1

To those who have a similar problem or need I am posting this solution I put together. It may sound as if this is crazy, but please believe when I tell you that I do require this and the actual SPs that need this are too long to post.
The spParentChild has not changed and remains as above. spParent is changed as shown below. The result is that spParent calls spParentChild. In his case if an error occurs in spParentChild the message is passed up to spParent in the output parameter.
I shall attempt to answer any questions should you have any. Following is spParent:
ALTER PROCEDURE [dbo].[spParent]
#isApproved varchar(max) = 'TEST',
#ApplicationDBName varchar(100) = 'SecDB',
#ApplicationInsertSPName varchar(100) = 'spParentChild',
#resultP varchar(max) output
AS
BEGIN
BEGIN TRY
SET NOCOUNT ON;
IF #resultP <> ''
BEGIN
RAISERROR('An error occurred in the parent SP.', 18, 0)
END
DECLARE #params NVarChar(max)
SET #params = '#resultCC VarChar(100) OUTPUT' -- OUTPUT Parameter for the called child SP
DECLARE #SP_Call NVarchar(MAX) -- sp_executesql requires NVarChar
SET #SP_Call = '[' + #ApplicationDBName + '].[dbo].[' + #ApplicationInsertSPName + '] ' + ' ''1'', #resultCC OUTPUT' -- ResultCC is the output parameter for the sp_executesql
EXEC sp_executesql #SP_Call, #params, #resultCC = #resultP OUTPUT -- Assign the value to the output parameter of this SP
-- EXEC spParentChild 1, #resultCC output -- THE ABOVE 5 LINES OF CODE ARE EQUAL TO THIS IS A HARDCODED CALL
if #resultP <> ''
BEGIN
SELECT #resultP [Returned Value]
END
END TRY
BEGIN CATCH
Declare #ErrMessage Varchar(max)
Declare #ErrState Varchar(max)
Declare #ErrLine Varchar(max)
select #ErrMessage=ErrorMessage, #ErrLine=ErrorLine, #ErrState=ErrorState from fnGetError()
IF #ErrMessage is not Null
BEGIN
SELECT #resultP = #ErrMessage
SELECT #ErrMessage
END
ELSE
BEGIN
SELECT #resultP = 'An unknown error occurred.'
SELECT 'bbb'
raiserror(#resultP,18,0)
END
END CATCH
END
I hope this assists someone in such need.