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Delete trigger on same table

Author

Topic

chakri002
Starting Member

1 Post

Posted - 2008-05-08 : 18:15:18

I have 4 colums in a table
Project, Sections,Tasks,Subtasks
Each subtask will haven a row.

I need to write a trigger when I delete a task it needs to delete all the subtasks relating to it. When I delete a section it needs to delete all the tasks and subasks relating to it. similarly for project.
This trigger for task-subtask works.
CREATE TRIGGER "[Deletetasktrigger]" ON [Tbl] FOR DELETE AS
SET NOCOUNT ON
/* * CASCADE DELETES TO '[Tbl B]' */
DELETE [tbl] FROM deleted, [Tbl] WHERE deleted.[task] = [Tbl].[task]
THis works fine. But when I do it for sections I get this error.

"Maximum stored procedure, function, trigger, or view nesting level exceeded (limit 32)" ..

Help Please!!!!!!

sanoj_av
Posting Yak Master

118 Posts

Posted - 2008-05-09 : 05:55:13

The Probable reason is that you might be using Delete Triger in two or more tbles that try to delete the rows of each other which produce a circular non-ending loop.

quote:
Originally posted by chakri002

I have 4 colums in a table
Project, Sections,Tasks,Subtasks
Each subtask will haven a row.

I need to write a trigger when I delete a task it needs to delete all the subtasks relating to it. When I delete a section it needs to delete all the tasks and subasks relating to it. similarly for project.
This trigger for task-subtask works.
CREATE TRIGGER "[Deletetasktrigger]" ON [Tbl] FOR DELETE AS
SET NOCOUNT ON
/* * CASCADE DELETES TO '[Tbl B]' */
DELETE [tbl] FROM deleted, [Tbl] WHERE deleted.[task] = [Tbl].[task]
THis works fine. But when I do it for sections I get this error.

"Maximum stored procedure, function, trigger, or view nesting level exceeded (limit 32)" ..

Help Please!!!!!!

SwePeso
Patron Saint of Lost Yaks

30421 Posts

Posted - 2008-05-09 : 06:27:21

You can also use a simple CTE to make a "recursive" delete.
Examples are in Books Online.

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