MySQL auto-store datetime for each row

Question

In MySQL, I\'m sick of adding the columns dt_created and dt_modified (which are date time stamps for creation and last modified respectively) to al

Answer 1

If you're using phpmyadmin you can do this by :

Answer 2

could be set as default an on update of rows

ALTER TABLE `tablename` CHANGE `dt` `dt` TIMESTAMP on update CURRENT_TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP;

Answer 3

ALTER TABLE  `tablename` CHANGE  `dt`  `dt` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP

should be the correct code.

Answer 4

Well, you can't have both:

mysql doc:

It is not possible to have the current timestamp be the default value for one column and the auto-update value for another column.

Sad, isn't it?

You could however use null instead of now() following this tip

Answer 5

You can use DEFAULT constraints to set the timestamp:

ALTER TABLE
 MODIFY dt_created datetime DEFAULT CURRENT_TIMESTAMP

ALTER TABLE
 MODIFY dt_modified datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP

Then you wouldn't have to specify NOW() in your INSERT/UPDATE statements.

Reference: TIMESTAMP properties

Answer 6

In phpmyadmin you can set

OR use this query

ALTER TABLE  `tablename`
    CHANGE  `dt_created`  `dt_created` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP