Log in
::
Register
::
Not logged in
Home
Tags
Articles
Editorials
Stairways
Forums
Scripts
Videos
Blogs
QotD
Books
Ask SSC
SQL Jobs
Training
Authors
About us
Contact us
Newsletters
Write for us
Recent Posts
Recent Posts
Popular Topics
Popular Topics
Home
Search
Members
Calendar
Who's On
Home
»
SQL Server 2005
»
SQL Server 2005 General Discussion
»
DML in Functions
DML in Functions
Rate Topic
Display Mode
Topic Options
Author
Message
mithun.gite
mithun.gite
Posted Wednesday, April 22, 2009 1:42 AM
Old Hand
Group: General Forum Members
Last Login: Tuesday, May 11, 2010 2:15 AM
Points: 327,
Visits: 364
Dear friends,
Need understanding, that y v cant perform DMLs in Functions?
We can use DMLs using table variable in fucntion then y can with actual tables..
Please guide me thru..
Mithun
Post #702100
ChrisM@Work
ChrisM@Work
Posted Wednesday, April 22, 2009 1:52 AM
SSCertifiable
Group: General Forum Members
Last Login: Today @ 9:32 AM
Points: 5,613,
Visits: 10,981
mithun.gite (4/22/2009)
Dear friends,
Need understanding, that y v can perform DMLs in Functions?
We can use DMLs using table variable in fucntion then y can with actual tables..
Please guide me thru..
Mithun
From BOL:
The following statements are valid in a function:
Assignment statements.
Control-of-Flow statements except TRY...CATCH statements.
DECLARE statements defining local data variables and local cursors.
SELECT statements that contain select lists with expressions that assign values to local variables.
Cursor operations referencing local cursors that are declared, opened, closed, and deallocated in the function. Only FETCH statements that assign values to local variables using the INTO clause are allowed; FETCH statements that return data to the client are not allowed.
INSERT, UPDATE, and DELETE statements modifying local table variables.
EXECUTE statements calling extended stored procedures.
For more information, see Creating User-defined Functions (Database Engine).
Can you explain what you are trying to do?
“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.”
- Gail Shaw
For fast, accurate and documented assistance in answering your questions, please read
this article
.
Understanding and using APPLY, (I)
and
(II)
Paul White
Hidden RBAR: Triangular Joins
/
The "Numbers" or "Tally" Table: What it is and how it replaces a loop
Jeff Moden
Exploring Recursive CTEs by Example
Dwain Camps
Post #702105
mithun.gite
mithun.gite
Posted Wednesday, April 22, 2009 2:00 AM
Old Hand
Group: General Forum Members
Last Login: Tuesday, May 11, 2010 2:15 AM
Points: 327,
Visits: 364
Chris Morris (4/22/2009)
mithun.gite (4/22/2009)
Dear friends,
Need understanding, that y v can perform DMLs in Functions?
We can use DMLs using table variable in fucntion then y can with actual tables..
Please guide me thru..
Mithun
From BOL:
The following statements are valid in a function:
Assignment statements.
Control-of-Flow statements except TRY...CATCH statements.
DECLARE statements defining local data variables and local cursors.
SELECT statements that contain select lists with expressions that assign values to local variables.
Cursor operations referencing local cursors that are declared, opened, closed, and deallocated in the function. Only FETCH statements that assign values to local variables using the INTO clause are allowed; FETCH statements that return data to the client are not allowed.
INSERT, UPDATE, and DELETE statements modifying local table variables.
EXECUTE statements calling extended stored procedures.
For more information, see Creating User-defined Functions (Database Engine).
Can you explain what you are trying to do?
thanks chris for ur reply...........
after seeing ur reply i chekced my question which was bit wrong, which i corrected, actually i wan to know y we cant use DMLs in Functions?
Sorry for the trouble.......
And i m nothing trying but its been asked to me and i was clueless so i put it here..
Mithun
Post #702106
ChrisM@Work
ChrisM@Work
Posted Wednesday, April 22, 2009 2:26 AM
SSCertifiable
Group: General Forum Members
Last Login: Today @ 9:32 AM
Points: 5,613,
Visits: 10,981
From BOL, the first few sentences for CREATE FUNCTION:
Creates a user-defined function. This is a saved Transact-SQL or common language runtime (CLR) routine
that returns a value
. User-defined functions cannot be used to perform actions that modify the database state.
The purpose of a function is to return a value. For a simplistic model of why DML isn't supported in functions, consider this: you run a query which includes a function call against a table
SELECT *, myResult = dbo.fnDML(GETDATE(), dbo.fnGetWeather(GETDATE(), 'Reading, UK')) ...
- what's it going to do, add a column to a table if today is wednesday and it's sunny? Worse still, you could drop or add columns or even tables according to
values
in your source table. Row by row, the schema could change.
The structure of your db, which took
months
of careful design, is now all over the place.
“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.”
- Gail Shaw
For fast, accurate and documented assistance in answering your questions, please read
this article
.
Understanding and using APPLY, (I)
and
(II)
Paul White
Hidden RBAR: Triangular Joins
/
The "Numbers" or "Tally" Table: What it is and how it replaces a loop
Jeff Moden
Exploring Recursive CTEs by Example
Dwain Camps
Post #702123
mithun.gite
mithun.gite
Posted Wednesday, April 22, 2009 2:48 AM
Old Hand
Group: General Forum Members
Last Login: Tuesday, May 11, 2010 2:15 AM
Points: 327,
Visits: 364
Hey chris sir,,,
thanks for ur reply... now i know y we cant use dml in functions...
thanks , really thats usefulll
Mithun
Post #702132
ChrisM@Work
ChrisM@Work
Posted Wednesday, April 22, 2009 2:55 AM
SSCertifiable
Group: General Forum Members
Last Login: Today @ 9:32 AM
Points: 5,613,
Visits: 10,981
You're welcome - and I'm no 'sir', just a common working person, like yourself
“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.”
- Gail Shaw
For fast, accurate and documented assistance in answering your questions, please read
this article
.
Understanding and using APPLY, (I)
and
(II)
Paul White
Hidden RBAR: Triangular Joins
/
The "Numbers" or "Tally" Table: What it is and how it replaces a loop
Jeff Moden
Exploring Recursive CTEs by Example
Dwain Camps
Post #702138
« Prev Topic
|
Next Topic »
Permissions
You
cannot
post new topics.
You
cannot
post topic replies.
You
cannot
post new polls.
You
cannot
post replies to polls.
You
cannot
edit your own topics.
You
cannot
delete your own topics.
You
cannot
edit other topics.
You
cannot
delete other topics.
You
cannot
edit your own posts.
You
cannot
edit other posts.
You
cannot
delete your own posts.
You
cannot
delete other posts.
You
cannot
post events.
You
cannot
edit your own events.
You
cannot
edit other events.
You
cannot
delete your own events.
You
cannot
delete other events.
You
cannot
send private messages.
You
cannot
send emails.
You
may
read topics.
You
cannot
rate topics.
You
cannot
vote within polls.
You
cannot
upload attachments.
You
may
download attachments.
You
cannot
post HTML code.
You
cannot
edit HTML code.
You
cannot
post IFCode.
You
cannot
post JavaScript.
You
cannot
post EmotIcons.
You
cannot
post or upload images.
Copyright © 2002-2013 Simple Talk Publishing. All Rights Reserved.
Privacy Policy.
Terms of Use.
Report Abuse.