Thread

Re: Best way to create DML/DDL log?

Webb Sprague <wsprague100@yahoo.com> — 2000-08-21T16:20:36Z

I think there is either a switch to the psql client or
a "\" command in the session that allows you to log to
a file.  Even if you have to do some redirection, it
seems a lot better than modifying postgres.c (though I
am quite impressed that you would think about it...)

--- "Ingram, Bryan" <BIngram@sixtyfootspider.com>
wrote:
> I would like to create a long of all successful
> DML/DDL statements.
> 
> Has anyone accomplished this before?  No need to
> reinvent the wheel ...
> 
> If not ..I'm wondering what the best approach might
> be.
> 
> I have looked at the tcop/postgres.c source,
> thinking I might start by
> modifying some of the -dX routines for generating
> debugging output. 
> 
> I've also tried working a little with the -E option
> to the postgres backend,
> (passing it through postmaster as -o -E) but can't
> seem to redirect its
> output.
> 
> Finally, another option might be to create a
> trigger, but I haven't really
> explored this option.
> 
> One of the main requirements is that any function
> which returns a value
> which is determined by system environment must be
> written in the log as the
> evaluated statement, and not written as the function
> itself.  e.g. now()
> returns a text string of the current datetime which
> is written to the log in
> place of the literal character string 'now()'
> 
> As far as modifying postgres.c, I'm fairly confident
> I can create a log of
> the query buffer, but I haven't yet enough exposure
> to the source to find
> where I should check to see whether or not a
> statement was successful, or
> from where I might be able to pull text data from
> evaluated functions.
> 
> Any commentary on this would be much appreciated.  
> 
> Thanks,
> Bryan Ingram
> 
> 
> 
> 


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