Re: Triggers using PL/pgSQL

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

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Milen A. Radev