variable table names in trigger functions
- From: Hugo <mlist(at)nieuwenhuys(dot)com>
- To: pgsql-general(at)postgresql(dot)org
- Subject: variable table names in trigger functions
- Date: Thu, 31 Jan 2008 20:16:48 +0100
- Message-id: <47A21EA0.4030401@nieuwenhuys.com> <text/plain>
Hi all,
I've written a simple trigger function to store the old row in another table to log the data:
CREATE FUNCTION logusers() RETURNS trigger AS $$
BEGIN
INSERT INTO log.users SELECT FROM data.users WHERE id=OLD.id;
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
CREATE TRIGGER log BEFORE INSERT OR UPDATE ON data.users
FOR EACH ROW EXECUTE PROCEDURE logusers();
This works but I whould like to make a function without the table names hardcoded in it so it's usable for other tables.
I tried this:
CREATE FUNCTION log() RETURNS trigger AS $$
DECLARE
log_table name := 'log.'||TG_TABLE_NAME;
data_table name := TG_TABLE_SCHEMA||'.'||TG_TABLE_NAME;
BEGIN
INSERT INTO log_table SELECT FROM data_table WHERE id=OLD.id;
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
CREATE TRIGGER log BEFORE INSERT OR UPDATE ON data.users
FOR EACH ROW EXECUTE PROCEDURE log();
CREATE TRIGGER log BEFORE INSERT OR UPDATE ON data.posts
FOR EACH ROW EXECUTE PROCEDURE log();
But this doesn't work.
Any ideas on how to do this?
Thanks,
Hugo
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