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trigger not to execute

Posted on 2004-09-08
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Last Modified: 2012-05-05
is there a way for a stored procedure to tell a trigger not to execute.
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Question by:vinny45
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8 Comments
 
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Accepted Solution

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Anthony Perkins earned 500 total points
ID: 12011432
The easiest kludge that I have discovered is to add a column (SkipTrigger) of data type bit in the table and set it appropriately in the Insert/Update/Delete statement.  Then in your trigger:

You can do something like:
If Not Update(SkipTrigger)
   Begin
   -- Your code goes here


   End
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LVL 12

Expert Comment

by:patrikt
ID: 12011479
There is possibility to disable trigger for some time by ALTER TABLE table DISABLE TRIGGER trigger.
And then back by ENABLE.


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Expert Comment

by:BillAn1
ID: 12011524
another kludge is to create a view on the table, and put the trigger on the view instead of the table. if you want to fire the trigger insert/update/delete the view, otherwise hit the table directly.
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Expert Comment

by:Ernesto_Che_Guevara
ID: 12011592
>>There is possibility to disable trigger for some time by ALTER TABLE table DISABLE TRIGGER trigger<<
That is true and I should have mentioned that.  There is just one problem with that (and I suspect this is a major one for most shops), you need SysAdmin permissions.  
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Expert Comment

by:patrikt
ID: 12011624
Why do you thing. Just table owner must be enough.
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Expert Comment

by:SjoerdVerweij
ID: 12011879
Patrikt is right:

"ALTER TABLE permissions default to the table owner, members of the sysadmin fixed server role, and the db_owner and db_ddladmin fixed database roles, and are not transferable."

However, it's fairly moot since odds are that the table owner is dbo  :-)

If you must use a trigger (I'd highly recommend seeing if you can have all data stuff go through stored procedures), here's an alternative that's less intrusive than acperkins' solution, but I wouldn't use it in a table with lots of concurrent updates:

Create Table SkipTr(SPID Integer)

In your stored procedure, do this right before the update:

Insert Into SkipTr(@@SPID)

In the trigger:

If Exists(Select * From SkipTr Where SPID = @@SPID)
  Delete From SkipTr Where SPID = @@SPID
Else
  Begin

    ... real trigger action ...

  End

Note: I haven't tested this; you might encounter some odd transactional behavior, so test first!
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Expert Comment

by:arbert
ID: 12013252
Not to mention that altering a table will also disable the trigger system wide and not just for your process.....

I've also used AC's method of adding a dummy column....

SjoerdVerweij , very interesting idea--might have to toy with that :)
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by:Anthony Perkins
ID: 12013549
>>I've also used AC's method of adding a dummy column....<<
And I wonder who he got it from :)
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