On Wednesday 12 Jun 2002 9:32 pm, Jan Wieck wrote:
> GRIMOIS Eric wrote:
> > Hi all
> >
> > I read in the doc than a same function can be used for several triggers.
> > I tried to create a function who updates a field with a timestamp and
> > another field with the user name. This function is fired by triggers in
> > several tables.
> > It only works if updated fields have same names in all tables. I failed
> > to create a function where fields names are parameters of the function.
>
> You could do that with the EXECUTE functionality. But that
> causes *every* execution of these statemets not beeing
> cacheable, so it'll have an impact on performance.
Or look in the cookbook linked from techdocs.postgresql.org - there's an
example in there of a "trigger maker" which builds last-changed tracking
triggers and functions. You do something like:
select lastchg_addto('TABLE-NAME','TIMESTAMP-COLUMN-NAME')
And it creates the relevant function and trigger code then EXECUTEs it.
Shouldn't take much to alter it for your purposes
- Richard Huxton
