At 12:17 PM +0100 1/31/03, Marco Deppe wrote:
Hi,

I was already questioning my sanity, but the problem below is
reproduceable:

This is how my table looks:
mysql> describe T_ORDH;
--------------+----------------------+-----+----+--------+--------
Field         |Type                  |Null |Key |Default |Extra
--------------+----------------------+-----+----+--------+--------
PK_ID         |int(10) unsigned      |     |PRI |NULL    |auto_inc
ERSTELL_DATUM |timestamp(14)         |YES  |    |NULL    |
STATUS        |smallint(5) unsigned  |     |    |0       |

If I do
mysql> update T_ORDH set STATUS=2 where PK_ID=26272;
ERSTELL_DATUM is set to the current date. I know that a timestamp
takes the current time, if set it to NULL, but since I'm not touching
it, it shouldn't change, should it?

A quick workaround is
mysql> update T_ORDH set STATUS=2, ERSTELL_DATUM=ERSTELL_DATUM
    -> where PK_ID=26272;

The big question: Is it a bug or a feature?
(mysql  Ver 11.18 Distrib 3.23.51, for pc-linux-gnu (i686))

From:

http://www.mysql.com/doc/en/DATETIME.html

Automatic updating of the first TIMESTAMP column occurs under any of the following conditions:

<snip>

# You explicitly set the TIMESTAMP column to NULL


...so that means it's a feature.

-steve

--
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| Steve Edberg [EMAIL PROTECTED] |
| University of California, Davis (530)754-9127 |
| Programming/Database/SysAdmin http://pgfsun.ucdavis.edu/ |
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| SETI@Home: 1001 Work units on 23 oct 2002 |
| 3.152 years CPU time, 3.142 years SETI user... and STILL no aliens... |
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