Re: Can a nested function determine it is being called within a trigger? - Mailing list pgsql-general

Basil Bourque <basil.list@me.com> writes:
> When a trigger calls a function, that function can determine if it is being called from within a trigger by testing
fora value in the special variable "TG_OP". 

Uh, no, not really.  TG_OP is a local variable in the trigger function;
it's not visible from elsewhere.

> But what if a trigger calls a function that calls a 2nd function via the "PERFORM" command? Can that 2nd function
tellif it is being run in a trigger? 

No.  Doesn't really matter whether you use PERFORM or not.

            regards, tom lane