Re: scope quirk in copy in function

On 03/23/2015 06:59 AM, Scott Ribe wrote:
> create or replace function archive_some_stuff() returns void as $$
> declare cutoff timestamptz;
> begin
>    cutoff := now() - '1 day'::interval;
>    copy (select * from log where end_when < cutoff) to ...
>    ...
>
> Gives me an error that there is column named cutoff. (Other uses of cutoff in queries not inside a copy, iow the
deletefrom commands, work.) 
>
> Is there any alternative to just duplicating the now() expression inside every copy?

http://www.postgresql.org/docs/9.3/interactive/plpgsql-implementation.html#PLPGSQL-VAR-SUBST

"Variable substitution currently works only in SELECT, INSERT, UPDATE,
and DELETE commands, because the main SQL engine allows query parameters
only in these commands. To use a non-constant name or value in other
statement types (generically called utility statements), you must
construct the utility statement as a string and EXECUTE it."

>


--
Adrian Klaver
adrian.klaver@aklaver.com