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Stored procedure in User defined function?


Stored procedure in User defined function?

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sarveshcnakhate
sarveshcnakhate
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Can I call Stored procedure in User defined function?

- Sarvesh
GSquared
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Nope.

- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
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sarveshcnakhate
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Thanks for the reply!
But can you explain this in detail?
GSquared
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Not sure what details you need. You can't run procs from inside UDFs. What details can there be beyond, "can't do that"?

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sarveshcnakhate
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I want to know why it is not possible to do so? There must be some logical Reason/constraint.
GSquared
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Because UDFs are specifically designed to not do that. Books Online has the details of what they can and cannot do.

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Kent Waldrop
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There is a workaround in which you can use OPENROWSET to call a stored procedure from a function; however, this is in general a bad idea and should be avoided.
RBarryYoung
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sarveshcnakhate (1/12/2009)
I want to know why it is not possible to do so? There must be some logical Reason/constraint.

Because like Excel and some other environments, SQL Server enforces a "strong" definition of functions (the one you should have learned in college) that a Function returns a value and has no side-effects. This is as opposed to the "C-culture" view of functions, that cannot tell the difference between a function and a subroutine, and wherein the whole point of calling functions is to cause side-effects.

And the SQL parser, optimizer and data engine rely heavily on the assumption that functions cannot cause changes in the database while they are being invoked. Almost all of the restrictions in UDF revolve around insuring that this is the case.

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Kent Waldrop
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Bingo. That is the same reason that makes the workaround a very bad idea. Thank you, Barry. Smile
RBarryYoung
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Right Kent. It's a cool trick, but should only be used when truly desperate.

I have seen it cause such things as "undetectable deadlocks". These are really nasty because they really are deadlocks that SQL Server cannot detect. As such they will not go away until you reboot SQL Server (or you can figure out how to kill the OPENROWSET connection).

-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
Proactive Performance Solutions, Inc.
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