Обсуждение: timestamp data type?

Is there a timestamp data type that will automatically update the date and time when a record gets inserted/updated. I
knowMySQL has this feature, i was wondering if postgresql had a equivalent data type 

MySQL Doc
"The TIMESTAMP column type provides a type that you can use to automatically mark INSERT or UPDATE operations with the
currentdate and time." 
--
____________________________________________
http://www.operamail.com
Get OperaMail Premium today - USD 29.99/year


Powered by Outblaze

On Thu, 2003-05-22 at 07:51, psql novice wrote:
> Is there a timestamp data type that will automatically update the date
> and time when a record gets inserted/updated. I know MySQL has this
> feature, i was wondering if postgresql had a equivalent data type
>
> MySQL Doc
> "The TIMESTAMP column type provides a type that you can use to
> automatically mark INSERT or UPDATE operations with the current date
> and time."

There is no type that does this.

The way to do it on INSERT is:

CREATE TABLE xxx (
   ts TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
   ...);

This can be overridden if the insert provides a value for the field.

If you need it not to be overrideable or to be changed on update as
well, you need a trigger to fire BEFORE UPDATE OR INSERT

--
Oliver Elphick                                Oliver.Elphick@lfix.co.uk
Isle of Wight, UK                             http://www.lfix.co.uk/oliver
GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839  932A 614D 4C34 3E1D 0C1C
                 ========================================
     "We are troubled on every side, yet not distressed; we
      are perplexed, but not in despair; persecuted, but not
      forsaken; cast down, but not destroyed; Always bearing
      about in the body the dying of the Lord Jesus, that
      the life also of Jesus might be made manifest in our
      body."        II Corinthians 4:8-10

Am Don, 2003-05-22 um 17.03 schrieb Oliver Elphick:

> CREATE TABLE xxx (
>    ts TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
>    ...);

BTW: Is there a difference between DEFAULT now() and DEFAULT
CURRENT_TIMESTAMP ?

--
 e-Trolley Sayegh & John, Nabil Sayegh
 Tel.: 0700 etrolley /// 0700 38765539
 Fax.: +49 69 8299381-8
 PGP : www.e-trolley.de