Call Stored procedure from within another stored procedure, return values

This quick how-to shows an example of having two stored procedures that one stored procedure executes the other stored procedure passing values and returning a value to the calling parent stored proc. This would be handy passing in a value to dynamically populate a lookup table and stored that Id as a foreign key in a datatable. . This example asssumes you would have a parent table and a child/lookup table related back to the parent table.

'This stored procedure is called by a business component or webpage 
'passing into two parameters, executes sp_ChildStoredProc and passes on value. 
'The @Id OUTPUT returns the value.  

CREATE PROCEDURE sp_ParentStoredProc
(
@col1 varchar(20)
@ValuePassed varchar(50),
)
AS

declare @Id int
EXEC sp_ReturnValue @ValuePassed, @Id OUTPUT

INSERT INTO SomeTable
(col1, col2)
VALUES
(@col1, @Id)
RETURN
GO 

'This stored procedure is executed in the sp_ParentStoredProc above and passes'a varchar variable piece of data. The spChildStoredProc will insert this piece of data'into a lookup table if it doesn't exist, return the Identity column using Scope_Identity() function or'will return the identity value to the parent stored proc if the piece of data passed in already exists in the lookup table.

CREATE PROCEDURE sp_ChildStoredProc

(
@ValuePassedIn varchar(50),
@Id smallint OUTPUT
)
 AS

If exists (SELECT column1 FROM LookUpTable WHERE column1=@ValuePassedIn)
BEGIN
SET @Id = (SELECT column1 
   FROM LookUpTable 
   WHERE column1=@ValuePassedIn)
END 
ELSE
BEGIN
INSERT INTO LookUpTable(column1) 
VALUES(@ValuePassedIn)
    
    SET @Id = Scope_Identity()
END
GO

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