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Re: Partitioning documentation example

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Simon Riggs <simon(at)2ndquadrant(dot)com>
Cc: PostgreSQL-documentation <pgsql-docs(at)postgresql(dot)org>
Subject: Re: Partitioning documentation example
Date: 2008-01-04 16:54:48
Message-ID: 200801041654.m04GsmD17385@momjian.us (view raw or flat)
Thread:
Lists: pgsql-docs
Simon Riggs wrote:
> On Fri, 2008-01-04 at 10:27 -0500, Bruce Momjian wrote:
> 
> > It seems to me it would be much clearer if we added a second example
> > that used to_char() to create the INSERT statement dynamically based on
> > NEW.logdate:
> > 
> > 	CREATE OR REPLACE FUNCTION measurement_insert_trigger() 
> > 	RETURNS TRIGGER AS $$
> > 	BEGIN
> > 	   EXECUTE 'INSERT INTO measurement_y' || to_char(NEW.logdate,'YYYY_mMM') || ' VALUES (NEW.*)';
> > 	END;
> > 	$$
> > 	LANGUAGE plpgsql;
> > 
> > It will of course fail if the table does not exist, which I think is
> > what we want.  This trigger function would not have to be modified when
> > new tables are added.
> 
> I like your new trigger better than the old, but I am still
> uncomfortable with recommending we use triggers with COPY for
> performance reasons and we should add a caveat.

OK, I will add this example in addition to the examples already present.

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>        http://momjian.us
  EnterpriseDB                             http://postgres.enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +

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