Question

How would I create the following statement in MySQL/CodeIgniter?

Update the current value of “food” with variable $sell. So the result would be the value of “food” + $sell.

EDIT: Ok, I finally figured it out using CodeIgniters Active Record Class

$food_up = "food +" . $sell; 
$this->db->set('food', $food_up, FALSE)
         ->where('user_id', $uid);
$this->db->update('market'); 

Thank you for your suggestions 😉

Answer 1

Your solution is going to be a combination of an update and modifying the result using string literals and variables in MySQL.

UPDATE <table_name>
    SET col_name1={expr1|DEFAULT} [, col_name2={expr2|DEFAULT}] ...
[WHERE where_condition]

You are going to need to figure out how to “set” your column to the current value + a string literal. Your question does look a little confusing and its hard to tell if you actually need a variable or not, or if you are just appending something to the current value…