Question

The default initial value of one column in my database is the same as the row’s auto-incremented id. I’m trying to use triggers to set it.

CREATE TRIGGER `default_order_value` 
AFTER INSERT ON `clusters` 
FOR EACH ROW  
BEGIN  
    UPDATE `clusters` SET `order` = NEW.id WHERE `id` = NEW.id; 
END

But this keeps throwing a syntax error

#1064 – You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ” at line 5

I’ve tried all sorts of permutations of this with no luck. Can anyone see what I’m doing wrong?

Answer 1

As zerkms said, you need to change the delimeter. But since you only use 1 line of code, you don’t need the BEGIN and END. And that way, you don’t need to change the delimiter either

CREATE TRIGGER `default_order_value` 
AFTER INSERT ON `clusters` 
FOR EACH ROW  
    UPDATE `clusters` SET `order` = NEW.id WHERE `id` = NEW.id; 

Since you are getting an error you cannot update the row, I suggest the following:

Do NOT perform the update query at all. On default the order value = the ID value. So when the order value changes, you can update it properly.

If you are requesting the data with php, do something like this:

$order = $row['order'];
if ($order == '')
    $order = $row['id'];

After you need it updating, you’ve got the correct value.