Question

I’m having trouble creating a join in the codeigniter format, i have a MySQL query that returns what i want:

SELECT nwsite.siteid, nwsite.installer_username,
       calcdata.esolar, calcdata.time, calcdata.wsolar
FROM nwsite, calcdata
WHERE nwsite.siteid = calcdata.siteid AND time = '2011-10-29 12:45:00';

I’ve looked at the documentation but i keep getting it wrong.

Thanks

Answer 1

From the CI docs…

$this->db->select('*');
$this->db->from('blogs');
$this->db->join('comments', 'comments.id = blogs.id');

$query = $this->db->get();

// Produces: 
// SELECT * FROM blogs
// JOIN comments ON comments.id = blogs.id

So in your case, I would not use the cartisian product in your FROM, I would actually use a join.

$this->db->select("... your fields here...");
$this->db->from("nwsite");
$this->db->join("calcdata", "nwsite.siteid = calcdata.siteid");
$this->db->where("nwsite.time", "2011-10-29 12:45:00");

$query = $this->db->get();

For Future reference, I often utilize

die($this->db->last_query());

to output the actual query that’s being generated. It makes it easier to debug and compare to what you are attempting to generate.