Adding up DATETIME field

[M. Bader]

Hi,

i'm struggling with updating session expire times in my login table.

Can you tell me, how to correctly add an amount of seconds (after that
the session expires) to a datetime field?

when i do the insert for a new login, or an update, the expire field
will alway end up containing zeros

below are my statements and structure, (MySQL version: 4.0.13)
Thanks for any help

Maik

INSERT INTO `user_login` (
`id_kontakt`,
`id_user`,
`session`,
`expire`,
`ip`,
`browser`,
`id_sprache`,
`username`)
VALUES (
25,
39,
'1061461259142493',
(NOW()+SEC_TO_TIME(6000)),
'192.168.0.3',
'Opera/7.11 (Windows NT 5.0; U) [de]',
1,
'maik'
);
UPDATE `user_login` SET `expire` = (NOW()+SEC_TO_TIME(6000))
WHERE `session` LIKE '1061461259142493';
CREATE TABLE `lok_user_login` (
`lfdnr` bigint(20) unsigned NOT NULL auto_increment,
`id_kontakt` bigint(20) unsigned NOT NULL default '0',
`id_user` bigint(20) unsigned NOT NULL default '0',
`username` varchar(255) NOT NULL default '',
`session` varchar(255) NOT NULL default '',
`expire` datetime NOT NULL default '0000-00-00 00:00:00',
`ip` varchar(15) NOT NULL default '',
`browser` varchar(255) NOT NULL default '',
`id_sprache` int(10) unsigned NOT NULL default '0',
PRIMARY KEY (`lfdnr`),
UNIQUE KEY `session` (`session`),
FULLTEXT KEY `session2` (`session`)
) TYPE=MyISAM;


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