> On Oct 14, 2013, at 8:18, Philipp Kraus <philipp.kraus@tu-clausthal.de> wrote: > >> Hello, >> >> I have written a update & delete trigger of a table. >> My delete trigger runs an update statement but this create a (semantic) problem. >> How can I disable the update trigger for only this update call within the delete trigger? >> So my delete trigger need not call the update trigger > > > You obviously don't want to disable the trigger entirely for all sessions, as other sessions may be updating records as well and those should trigger the update trigger normally. I think Pavel's suggestion, if executed from your delete trigger function, would disable the trigger for that session only, so that would work. Don't forget to re-enable it again after the update finishes. > > Another solution is to make your update trigger smarter about when it needs to do its thing. > For example, you could add a "fake" boolean column to the table and set that to one value when updated from your delete trigger, while you normally leave it at the other value (easiest by means of a column DEFAULT value). In your update trigger you can then test for the value of that column and escape out of the trigger function (RETURN NEW, for example). > > Nowadays you can put triggers on views even, in which case you could do the above on a view over the table, omitting the need to actually store the fake column value.
I have got a plsql function like that:
begin
if (TG_OP = 'DELETE') then update simulation.source set parent=old.parent where parent=old.id; * return old;
elseif (TG_OP = 'UPDATE') then
do something
end if;
end
This function is called on the before delete & update call, so the * call creates a problem. On this call the elseif (TG_OP = 'UPDATE') then need not run at any time. I think the boolean field can be helpful, but is there another idea to disable on the * call the update trigger?
Thanks
Phil
What about using UPDATE OF?
CREATE TRIGGER test_simulation_trigger BEFORE DELETE OR UPDATE OF C1,C2,C3 on simulation FOR EACH ROW EXECUTE PROCEDURE trigger_function();
You can include all columns to be used for update trigger and omit parent column.
