Обсуждение: triggers problems whit function

2008/10/22 Ma. Cristina Peña C. <mpena@sensacd.com.mx>
A trigger function must have a specific structure, it takes no arguments and returns "trigger". Besides, trigger functions are supposed to do some processing before or after insert, update or delete operations, so there's no sense in returning a row count.

Take a look at the docs, specially chapter 35 and 38.9.

Cheers.

Fernando Moreno a écrit :
> 2008/10/22 Ma. Cristina Peña C. <mpena@sensacd.com.mx
> <mailto:mpena@sensacd.com.mx>>
>
>     I want to use a function in to a trigger
>
>     This is my
>
>     CREATE FUNCTION "subradio"(integer) RETURNS integer AS 'select
>     cast(count (claveubica) as integer ) from asradios where ubicacion
>     =0;' LANGUAGE 'sql';
>
>     And my ttrigger is
>
>     CREATE TRIGGER validaradios AFTER DELETE ON subestacion FOR EACH ROW
>     EXECUTE PROCEDURE subradio(0);
>
>     But I got an error
>
>     ERROR:  CreateTrigger: function subradio() does not exist
>
>     What can I do??
>
> A trigger function must have a specific structure, it takes no arguments

It can take arguments.

> and returns "trigger".

And this is why, I think, the message tells "function subradio does not
exist". Because there's no subradio function that returns trigger.

> Besides, trigger functions are supposed to do
> some processing before or after insert, update or delete operations, so
> there's no sense in returning a row count.
>
> Take a look at the docs, specially chapter 35 and 38.9.
>

Regards.


--
Guillaume.
 http://www.postgresqlfr.org
 http://dalibo.com

Guillaume Lelarge <guillaume@lelarge.info> writes:
> Fernando Moreno a �crit :
>> A trigger function must have a specific structure, it takes no arguments

> It can take arguments.

No, it can't.  At least not in the declaration.

            regards, tom lane

Tom Lane a écrit :
> Guillaume Lelarge <guillaume@lelarge.info> writes:
>> Fernando Moreno a écrit :
>>> A trigger function must have a specific structure, it takes no arguments
>
>> It can take arguments.
>
> No, it can't.  At least not in the declaration.
>

Oops, you're right. Arguments shouldn't be declared, but can be used in
the body of a PL/pgsql trigger function.

Sorry about this.


--
Guillaume.
 http://www.postgresqlfr.org
 http://dalibo.com

El mié, 22-10-2008 a las 15:01 -0500, Ma. Cristina Peña C. escribió:
> I want to use a function in to a trigger
>
>
>
> This is my
>
> CREATE FUNCTION "subradio"(integer) RETURNS integer AS 'select
> cast(count (claveubica) as integer ) from asradios where ubicacion
> =0;' LANGUAGE 'sql';
>
>
>
> And my ttrigger is
>
> CREATE TRIGGER validaradios AFTER DELETE ON subestacion FOR EACH ROW
> EXECUTE PROCEDURE subradio(0);
>
>
>
> But I got an error
>
> ERROR:  CreateTrigger: function subradio() does not exist
>
>
>
> What can I do??

write your function in plpgsql

http://www.postgresql.org/docs/8.3/interactive/plpgsql-trigger.html






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