Re: Trigger questions
| От | David G. Johnston |
|---|---|
| Тема | Re: Trigger questions |
| Дата | |
| Msg-id | CAKFQuwbXO=WTBVrkZCe25AR+bphP+_L6xx7rJWLOdST70hGt8A@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Trigger questions (Justin <zzzzz.graf@gmail.com>) |
| Список | pgsql-general |
On Thu, May 4, 2023 at 7:04 AM Justin <zzzzz.graf@gmail.com> wrote:
On Thu, May 4, 2023 at 9:49 AM DAVID ROTH <adaptron@comcast.net> wrote:1) Can I create a trigger on a view?2) Do triggers cascade?Say I have an insert trigger on a table.And, I have an insert trigger on a view that references this tableIf I do an insert on the view, will both triggers fire?Can not have triggers on Views, Views use RULES which are DO INSTEAD.
https://www.postgresql.org/docs/current/rules.html
Our users need not care or even know about this particular implementation detail of views. For them, views are a fundamental concept.
The description of create trigger makes is perfectly clear that views are a valid "table-like" target for a trigger.
> CREATE TRIGGER creates a new trigger. CREATE OR REPLACE TRIGGER will either create a new trigger, or replace an existing trigger. The trigger will be associated with the specified table, view, or foreign table and will execute the specified function function_name when certain operations are performed on that table.
Depending on the view definition, the need for a trigger may be removed since some views are auto-updatable.
David J.
В списке pgsql-general по дате отправления: