Re: values from now() in the same transaction

The problem with gettimeofday() is that it returns a string, rather than
a timestamp.  This was all clarified in 8.2:

       Add clock_timestamp(), statement_timestamp(), and
       transaction_timestamp() (Bruce)
       clock_timestamp() is the current wall-clock time,
       statement_timestamp() is the time the current statement arrived at
       the server, and transaction_timestamp() is an alias for now().


---------------------------------------------------------------------------

Chris Browne wrote:
> zelvlad@yahoo.com (Vladimir Zelinski) writes:
> > I tried function now(),current_timestamp() but all of
> > them behave similar.
> >
> > I don't believe that it's bug, probably it's a feature
> > of the postgreSql database.
>
> Indeed, that is intentional.  CURRENT_TIMESTAMP and NOW() return the
> time at which the transaction began.
>
> > Is any way to insert a timestamp within the same transaction that
> > would have current system time (not time of the beginning of the
> > transaction)?
>
> > With other words, I would like to see different timestamps on first
> > and last timestamp.
>
> timeofday() is what you are looking for.
>
> Consider the following series of queries; they demonstrate how the
> behaviours of now() and timeofday() differ fairly successfully...
>
> oxrsorg=# begin;
> BEGIN
> oxrsorg=# select now();
>               now
> -------------------------------
>  2007-02-16 23:23:23.094817+00
> (1 row)
>
> oxrsorg=# select timeofday();
>               timeofday
> -------------------------------------
>  Fri Feb 16 23:23:31.481780 2007 UTC
> (1 row)
>
> oxrsorg=# select timeofday();
>               timeofday
> -------------------------------------
>  Fri Feb 16 23:23:32.981137 2007 UTC
> (1 row)
>
> oxrsorg=# select timeofday();
>               timeofday
> -------------------------------------
>  Fri Feb 16 23:23:33.988252 2007 UTC
> (1 row)
>
> oxrsorg=# select now();
>               now
> -------------------------------
>  2007-02-16 23:23:23.094817+00
> (1 row)
>
> oxrsorg=# select timeofday();
>               timeofday
> -------------------------------------
>  Fri Feb 16 23:23:38.643998 2007 UTC
> (1 row)
>
> oxrsorg=# select now();
>               now
> -------------------------------
>  2007-02-16 23:23:23.094817+00
> (1 row)
>
>
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--
  Bruce Momjian  <bruce@momjian.us>          http://momjian.us
  EnterpriseDB                               http://www.enterprisedb.com

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