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Re: Timestamp vs Datetime
Posted by: Erin ONeill
Date: July 22, 2005 11:41AM

I'm using MyIASM tables but here's how I can sneak in a trigger like effect with timestamp IN VERSION 4.0 and 4.1 (this is sooo totally cool):

CREATE TABLE mytable (
my_id tinyint unsigned NOT NULL auto_increment,
last_name varchar(30),
first_name varchar(30) NOT NULL,
active enum('yes','no') NOT NULL default 'yes' ,
created datetime NOT NULL,
last_mod timestamp(14) default 'CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP',
PRIMARY KEY(my_id),
KEY firstname(first_name)
) type=MYISAM;

Insert some data and select it all (I only inserted last_name, first_name). Notice the timestamp. Then update that record, do another select all and notice the timestamp. IT CHANGED!

Cool, huh.
There is a problem with 4.0.20 in that the CURRENT .... needs to be surrounded by quotes.

I tried to use datetime and use on update NOW() or CUR() but nothing worked. Seems 4.0 won't allow functions in datetime but will with timestamp.

or at least that's what I found. If you know differently I'd love to hear!

erin

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