Codeigniter数据库类中的列总和如何？

Question

I want to sum a column data if date is in between some predefined date.

i am doing this with core php is like

SUM(IF(`trl`.`entrydate` between '2015-01-01' and '2015-01-31', `trl`.`itemvalue`, 0))

So how can i do it with codeigniter

Answer 1

with active records:

    $this->db->select_sum('data');
    $this->db->where("entrydate between 'x' and 'y' ");
    $query = $this->db->get('your table');

with query :

$this->db->query("select SUM(data) from `your table` where entrydate between 'x' and 'y' ");