On Thu, 7 Dec 2006, Marc Evans wrote:
Hello -
I find myself trying to find a way to have the table name used with the
insert command be generated on the fly in a rule. For example, consider the
following:
create table foobars (
id bigserial,
created_at timestamp not null,
name
);
create table foobars_200612 (
check (created_at >= timestamp '2006-12-01 00:00:00' and created_at <
timestamp '2007-01-01 00:00:00')
) inherits (foobars);
create table foobars_200701 (
check (created_at >= timestamp '2007-01-01 00:00:00' and created_at <
timestamp '2007-02-01 00:00:00')
) inherits (foobars);
create rule foobars_insert as
on insert to foobars do instead
insert into (select 'foobars_' || extract(year from NEW.created_at) ||
extract(month from NEW.created_at))
(created_at,name) values (now(),'hello');
I realize that I could craft a list of many ON INSERT TO foobars WHERE xxx
constructs, but am trying to be a bit more maintainable than having each of
the where clauses hard-defined. Any suggestions?
Thanks in advance - Marc
To answer my own question, I have found this to work. If anyone has
suggestions for improvements, please let me know.
create or replace function foo_insert(TIMESTAMP,TEXT) returns void as $$
begin
execute 'insert into foobars_' ||
(select extract(year from $1) || extract(month from $1)) ||
' (created_at,name) values (\'' || $1 || '\',\'' || $2 || '\')';
end;
$$ language plpgsql;
create rule foobars_insert as on insert to foobars
do instead select foo_insert(NEW.created_at,NEW.name);
- Marc
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