Codeigniter parentheses in dynamic Active Record query

Question

I\'m producing a query like the following using ActiveRecord

SELECT * FROM (`foods`) WHERE `type` = \'fruits\' AND 
       `tags` LIKE \'%green%\' OR `tags`          


        

Answer 1

Just adding my successful solution:

$this->db->where("(table.field = $variable OR table.field IS NULL)");

Answer 2

One of best feature to save your query when you applying multiple where or_where clauses.

$this->db->group_start();
$this->db->where();
$this->db->or_where();
$this->db->group_end();

Happy Coding. :)