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SQL Server Named Parameters

Posted on 2010-11-10
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Last Modified: 2012-06-27
Can named parameters be used in a function call as they can be in a stored procedure call?

Kevin
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Question by:zorvek (Kevin Jones)
9 Comments
 
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Expert Comment

by:David Kroll
ID: 34105920
sure.

ex:

CREATE FUNCTION [dbo].[function1]   ( @pvar1 varchar(30),  @pvar2 varchar(30), @pvar3 int )
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Expert Comment

by:Shaun Kline
ID: 34105927
Assuming you mean user defined functions, yes.
http://www.sqlteam.com/article/user-defined-functions
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Expert Comment

by:cyberkiwi
ID: 34105986
NO

create function dbo.namedfun (@i int , @j int) returns int
as begin
return @i+@j
end

select dbo.namedfun (1, 2)
select dbo.namedfun (@i=1, @j=2)
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Expert Comment

by:cyberkiwi
ID: 34105998
Welcome to SQL, Kevin.
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Expert Comment

by:cyberkiwi
ID: 34106022
A more complete sample
One line will fail as indicated
use tempdb
GO
create function dbo.namedfun (@i int , @j int) returns int
as begin
return @i+@j
end
GO
select dbo.namedfun (1, 2) -- ok
GO
select dbo.namedfun (@i=1, @j=2) -- fail
GO
drop function namedfun
GO
create proc dbo.namedproc @i int , @j int
as
select @i * 10 + @j
GO
exec dbo.namedproc 1, 2 -- ok, result is 12
GO
exec dbo.namedproc @j=1, @i=2 -- ok, result is 21, not 12
GO
drop proc namedproc
GO

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Author Comment

by:zorvek (Kevin Jones)
ID: 34106297
So we can't call a function with named arguments like we can with a stored procedure. And, from what I have learned since posting the question, ALL the parameters have to ALWAYS be passed.

Correct?

Kevin
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LVL 58

Accepted Solution

by:
cyberkiwi earned 500 total points
ID: 34106373
Yes. Defaults are not available to functions.
Best bet to implement "defaults" is to have functions that call other functions.
(here add2 is a shorter form of add3 with param3 defaulted to 0)

create function add2(@a int, @b int) returns int as
begin
return dbo.add3(@a, @b, 0)
end
GO
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LVL 81

Author Comment

by:zorvek (Kevin Jones)
ID: 34106416
cyberkiwi,

Kewl!

Sort of like overloading. I like.

Thanks!

Kevin
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