Re: Triggers using PL/pgSQL

["Milen A. Radev" <milen(at)radev(dot)net>]

Thusitha Kodikara написа:
> Hello,
> 
> I am interested in developing some triggers to keep track of records that are changed (possibly the changes of one or more specific columns). In addition to keeping the new values, I also need to keep the old values (may be on a separate table).  
> 
> Though I  have done similar things in other RDBMs using SQL, I find doing this in Postgres, a little bit complicated - may be because it needs to be done through a separate procedural language and through a separate function. The Postgres documentation also didn't provide much help ( the examples in C). I was mainly looking for example showing how to refer 'OLD' and 'NEW' rows using PL/pgSQL.
> 
> Can someone please direct me to some such examples?


http://www.postgresql.org/docs/8.1/static/plpgsql-trigger.html


-- 
Milen A. Radev