phpmysqlcodeigniterjoinactiverecord

How to construct a CodeIgniter active record query with (implicit) comma-joined tables


Query in CodeIgniter:

$this->db->select('comments.created_at, comments.section_id, comments.submittedby_id, users.username, comments.text, sections.name');
$this->db->order_by('comments.created_at', 'desc');
$this->db->where('comments.submittedby_id',  'users.user_id'); 
$this->db->where('comments.section_id', 'sections.id'); 

$query = $this->db->get(array('comments', 'users', 'sections'),10);

Produces SQL (spacing added for readability):

SELECT
    `pdb_comments`.`created_at`,
    `pdb_comments`.`section_id`,
    `pdb_comments`.`submittedby_id`,
    `pdb_users`.`username`,
    `pdb_comments`.`text`,
    `pdb_sections`.`name`
FROM
    (`pdb_comments`, `pdb_users`, `pdb_sections`)
WHERE
    `pdb_comments`.`submittedby_id` = 'users.user_id'
    AND `pdb_comments`.`section_id` = 'sections.id'
ORDER BY
    `pdb_comments`.`created_at` desc
LIMIT
    10

The issue is that the database prefix (pdb_) does not get added in the WHERE clause. I can manually insert the prefix by appending $this->db->dbprefix, but this doesn't fix the main problem.

Quotes:

`pdb_comments`.`submittedby_id` = 'pdb_users.user_id'

The quotes on the right side are not accurate, and generate 0 results for me. Is there any way to make CodeIgniter recognize the second half of the where clause as a piece of my table; thereby adding the database prefix, and properly placing the quotes by avoiding two joins? Is there another way to do this?


Solution

  • Use:

    $this->db->select('comments.created_at, comments.section_id, comments.submittedby_id, users.username, comments.text, sections.name');
    $this->db->from('comments');
    $this->db->join('users', 'comments.submittedby_id=users.user_id'); 
    $this->db->join('sections', 'comments.section_id=sections.id'); 
    $this->db->order_by('comments.created_at', 'desc');
    $query = $this->db->get();
    

    instead.