Re: [GENERAL] Is it possible to use an EVENT TRIGGER to validate a TRIGGER?

[Luís Eduardo Oliveira Lizardo]

Hi Álvaro, thanks for your reaponse.

Can you please give me a small example showing how to do this, or more
hints?

Thanks in advance,

Luis Lizardo
On Jul 6, 2016 00:02, "Alvaro Herrera"  wrote:

> Luís Eduardo Oliveira Lizardo wrote:
> > Hi,
> >
> > Is it possible to use an EVENT TRIGGER to validate a TRIGGER definition?
> >
> > What I want is to guarantee that the trigger is fired AFTER a STATEMENT,
> on
> > INSERT or UPDATE but not on DELETE, like the following example:
>
> What you can do with a C language function in 9.5 is to examine the
> CreateTrigger struct and verify that it matches the conditions you want.
> So, yes, it's possible, but not in plpgsql.
>
> --
> Álvaro Herrerahttp://www.2ndQuadrant.com/
> PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
>

Re: [GENERAL] Is it possible to use an EVENT TRIGGER to validate a TRIGGER?

[Alvaro Herrera]

Luís Eduardo Oliveira Lizardo wrote:
> Hi,
> 
> Is it possible to use an EVENT TRIGGER to validate a TRIGGER definition?
> 
> What I want is to guarantee that the trigger is fired AFTER a STATEMENT, on
> INSERT or UPDATE but not on DELETE, like the following example:

What you can do with a C language function in 9.5 is to examine the
CreateTrigger struct and verify that it matches the conditions you want.
So, yes, it's possible, but not in plpgsql.

-- 
Álvaro Herrerahttp://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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[GENERAL] Is it possible to use an EVENT TRIGGER to validate a TRIGGER?

[Luís Eduardo Oliveira Lizardo]

Hi,

Is it possible to use an EVENT TRIGGER to validate a TRIGGER definition?

What I want is to guarantee that the trigger is fired AFTER a STATEMENT, on
INSERT or UPDATE but not on DELETE, like the following example:


CREATE TRIGGER mytrigger
   AFTER INSERT OR UPDATE ON mytable
   FOR EACH STATEMENT
   EXECUTE PROCEDURE myprocedure();


I know I can check those parameters inside the trigger function with TG_OP,
TG_WHEN and TG_LEVEL, but in this way, it only checks if the trigger is
correct during an insertion, upload or deletion, and not right after the
trigger definition.

Best regards,

Luis Lizardo