i know ,in quartz.net ,change a old trigger like below,
scheduler.RescheduleJob(oldname,oldgroup,newtrigger);
it need have not the same name with old trigger name,
but i need to change trigger with the same trigger name,is there anyway to solve?
You can also delete the trigger using scheduler.UnscheduleJob(triggerName, groupName)and then schedule the job again.
Related
I am also creating the trigger but it aslo does not work
After creating this trigger i can not insert any borrow recorde.. But I want to make the trigger so that I can not insert the burrow record in December.
I create event trigger:
CREATE EVENT TRIGGER tr_event_begin ON ddl_command_start EXECUTE PROCEDURE event_trigger_begin();
later I need to change the event or procedure. Now, I have to do so:
DROP EVENT TRIGGER tr_event_begin;
CREATE EVENT TRIGGER tr_event_begin ON ddl_command_end EXECUTE PROCEDURE myProc();
how to do it differently? Without removing the trigger, update it... sql only.
I think your proposal is the most elegant way to do it.
https://www.postgresql.org/docs/current/static/sql-altereventtrigger.html
Sorry but I'm struggling with the online documentation.
What exactly is the difference for a FOR trigger compared to a AFTER and INSTEAD OF?
Thanks
The FOR and the AFTER trigger is the same. You specify them in the same way and they do the same thing:
CREATE TRIGGER sometrigger on sometable FOR INSERT,UPDATE,DELETE
CREATE TRIGGER sometrigger on sometable AFTER INSERT,UPDATE,DELETE
The INSTEAD OF trigger is something completely different. When you specify a trigger with the instead of then the trigger will execute instead of the insert, update and delete. This can be useful when you have views. So you can control what should be delete, updated and inserted in the views underlying tables
Here is an link to explain the triggers in more depth
Hi I am trying to figure out the syntax for triggers. I have two tables one called tagged_in and the other notification. So I want to make a trigger where when an insert is called in tagged_in I want to insert a tuple in notification.
The manuals are available at the DB2 InfoCenter. Did you read the CREATE TRIGGER statement information yet? If not, why not? If so, what did you try, and what error did you get?
Something like this
CREATE TRIGGER TEST_TRIGGER
AFTER INSERT ON TAGGED_IN
REFERENCING NEW AS NEW_TAG
FOR EACH ROW
BEGIN ATOMIC
INSERT INTO NOTIFICATION
VALUES (NEW_TAG.FIELD1,NEW_TAG.FIELD2);
END
How do I only create a trigger if it does not exist?
When I do create or replace, I get a syntax error so I am looking for a way to test for the existence of a trigger.
I can always select * from pg_trigger, but I am sure there is a more suitable way.
Thanks
Postgres can conditionally drop a trigger - see the docs. Do this before creating the trigger, then it will always work.
DROP TRIGGER IF EXISTS mytrigger ON mytable;
As Jack points out in the comments, this feature has only been available since 8.2; this has been out for more than four years though, so it should be available in your version.
CREATE TRIGGER (NameOfTrigger) AFTER INSERT OR UPDATE ON (NameOfTable)
DROP TRIGGER IF EXISTS (NameOfTrigger) ON (NameOfTable);