Re: atomic function

Mage schrieb:
> Hello!
>
> What's wrong with this function?
>
> public | common_adviewnum_increase | integer | bigint,
> character varying | postgres | plpgsql |
> declare
> row record;
> result int;
> begin
> select into row viewnum from common_adviewnum where adid = $1 and
> site = $2 and day = now()::date;
> if found then
> result = row.viewnum + 1;
> update common_adviewnum set viewnum = result where adid =
> $1 and site = $2 and day = now()::date;
> else
> result = 1;
> insert into common_adviewnum (adid, site, day, viewnum)
> values ($1, $2, now()::date, result);
> end if;
> return result;
> end;
>
> Every 2-3 day I get this in the server log:
>
> 2005-08-12 19:08:43: ERROR: duplicate key violates unique constraint
> "common_adviewnum_adid_site_day_index"
> CONTEXT: SQL statement "insert into common_adviewnum (adid, site, day,
> viewnum) values ( $1 , $2 , now()::date, $3 )"
> PL/pgSQL function "common_adviewnum_increase" line 11 at SQL statement
> select common_adviewnum_increase(820434,'H');
>

You might find out by replacing this function with something you find
here:

http://www.postgresql.org/docs/current/static/functions-sequence.html