Обсуждение: exception handling and CONTINUE

Marcin Krawczyk escribió:
> Hi all. Can anyone tell me if there's a way to use CONTINUE clause outside
> the loop ?
> An example :
> 
> FOR a IN SELECT * FROM xxx
> LOOP
> 
> INSERT INTO yyy VALUES (a.***, ..)
> 
> END LOOP;
> 
> EXCEPTION WHEN unique_violation THEN CONTINUE;

Try something like this:

for a in select * from xxx
loop begin   insert into yyy values (...) exception when unique_violation then   null;    -- noop, just for clarity
end;
end loop;

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

no, you can use CONTINUE only in loop. When you wont ignore exception,
just do nothing
For example, the following two fragments of code are equivalent:
   BEGIN       y := x / 0;   EXCEPTION       WHEN division_by_zero THEN           NULL;  -- ignore the error   END;
   BEGIN       y := x / 0;   EXCEPTION       WHEN division_by_zero THEN  -- ignore the error   END;

http://www.postgresql.org/docs/8.3/static/plpgsql-statements.html

Regards
Pavel Stehule

2008/7/8 Marcin Krawczyk <jankes.mk@gmail.com>:
> Hi all. Can anyone tell me if there's a way to use CONTINUE clause outside
> the loop ?
> An example :
>
> FOR a IN SELECT * FROM xxx
> LOOP
>
> INSERT INTO yyy VALUES (a.***, ..)
>
> END LOOP;
>
> EXCEPTION WHEN unique_violation THEN CONTINUE;
>
> I get an error saying I can't use CONTINUE outside of a loop. Is there a way
> around this ?
>
> regards
> mk

<p>Thank you guys. <p>Alvaro your idea works tha way I wanted. Why didn't I think about it ? :)<p>regards<p>mk