how to update text[x] field at orders_total ?

[apophis]

Hello,

 

my brain is complitely empty and I cant find out what I must do, so problem: Im buildin' wholesale shop, and sometimes there is need to change shipping price at administrator tools. but problem is that I cant change only needed column (at table orders_total field text),

with line:

tep_db_query("update " . TABLE_ORDERS_TOTAL . " set text = '" . tep_db_input($new_ship) . "' where orders_id = '" . tep_db_input($oID) . "'");

 

it changes all columns at text field, how is possible to change only one field ? only text[sizeof($order->totals)-2] ? later on ofcourse text[sizeof($order->totals)-1] too coz I see no option to make some automatic calculation system there.

 

please ... any help is welcome, any hint any whateva ...