DATE_ADD problem

I am working to add 1 month to date() and save it in my field on database.

I use this

$query2 = "SELECT * ,DATE_ADD(`date_joined`,INTERVAL 30 DAY) AS expire FROM `set` WHERE ID='$idno'";
$result2 = mysql_query($query2);

"expire" is the field i want to save as +30 days. date_joined is current date.

but it doesn't wo开发者_如何学运维rk. expire field is still current date no error message.

what should i do?

or is there another way to add 30 days to current date and save it as my "expire" field ?

Thanks

You are missing a comma between the asterisk and the DATE_ADD call. It should look like this:

SELECT  *,
        DATE_ADD(`date_joined`, INTERVAL 30 DAY) AS expire 
FROM    `set` 
WHERE   ID='$idno'

Once you fix that, the query looks well formed.

Edit: It sounds like you need an update statement, not a select statement. Try:

update `set`
set    `expire` = date_add(`date_joined`, interval 30 day)
where  `id` = '$idno'

You will need an update statement.

UPDATE `set` SET expire = DATE_ADD(date_joined, INTERVAL 30 DAY)
WHERE ID='$idno'