SQL Server output parameter issue

Question

I am using SQL Server 2008 Enterprise. I am learning OUTPUT parameter of SQL Server stored procedure. For example, stored procedure sp_add_jobschedule has an OUTPUT paramete

Answer 1

Two other things I think that are worth noting:

1) You can pass more than one parameter as OUTPUT,

2) You do not have to call the parameters with OUTPUT if you don't want the results

CREATE PROCEDURE ManyOutputs @a int, @b int output, @c varchar(100) output, @d bit output
AS
BEGIN
    SET @b = @a + 11
    SET @c = 'The Value of A is ' + CAST(@a AS varchar(5)) + ', and the value of B is ' + CAST(@b AS varchar(5))
    IF (@a % 2 = 1)
        SET @d = 1
    ELSE
        SET @d = 0
END
GO

Calling this routine:

DECLARE @bVal int
DECLARE @cVal varchar(100)
DECLARE @dVal bit

EXEC ManyOutputs 1, @bVal, @cVal, @dVal
SELECT @bVal AS bVal, @cVal as cVal, @dVal as dVal

Returns NULL, NULL, NULL

EXEC ManyOutputs 2, @bVal OUT, @cVal OUT, @dVal OUT
SELECT @bVal AS bVal, @cVal as cVal, @dVal as dVal

Returns 13, "The Value of A is 2, and the value of B is 13", 0

EXEC ManyOutputs 3, @bVal, @cVal, @dVal
SELECT @bVal AS bVal, @cVal as cVal, @dVal as dVal

Returns 13, "The Value of A is 2, and the value of B is 13", 0

(the same as the last call, because we didn't get new values by using OUTPUT, so it retained the old values.)

EXEC ManyOutputs 5, @bVal OUT, @cVal OUT, @dVal OUT
SELECT @bVal AS bVal, @cVal as cVal, @dVal as dVal

Returns 16, "The Value of A is 5, and the value of B is 16", 1