inserting a field the a_i value of another field - php

Question

I have a table with the following fields: gallery(picID, picTimeStamp, location).
What I want is that when someone is uploading a new picture to the gallery, the location will get the same value that picID gets (and picID gets its value by auto increment).
I have tried:
"INSERT INTO gallery(picID, picTimeStamp, location) VALUES (null,'.time().',picID)"
but it is not working. I do not get any errors, the location just always has a zero in it.
Thanks!

Answer 1

You should probably be using trigger like this
CREATE TRIGGER trigger_name BEFORE INSERT ON gallery FOR EACH ROW
BEGIN
DECLARE next_id INT;
SET next_id = (SELECT AUTO_INCREMENT FROM gallery WHERE TABLE_NAME='gallery');
SET NEW.location=next_id;
END
edit: Should be after insert trigger instead of before because auto_increment number only gets set after the record is inserted. Sorry bout that!

Answer 2

Your table should be like this:
id | int | primary key/autoincrement
order | int | index
picTimeStamp | timestamp
and then if you want to create a new entry below pass the order number by GET:
function createBelow(){
if(isset($_GET["orders"])){
$orders = $_GET["orders"];
$query = "UPDATE links SET orders=orders+1 WHERE orders>$orders ORDER BY orders DESC";
mysql_query($query);
$query = "INSERT INTO `mydb`.`mytable` (`orders`) VALUES ($orders+1);";
mysql_query($query);
}
}
The default value takes care of id and timestamp, you don't enter these.