将MySQL查询转换为CodeIgniter中的Active Record

Question

I have this mysql query and I am very new to CodeIgniter. How can I convert this mysql query into CodeIgniter's Active Record?

SELECT chp_destination, cde_name, chp_year, chp_from, chp_to, chp_budget_price_high, 
chp_medium_price_high, chp_luxury_price_high, chp_budget_price_low, chp_medium_price_low, chp_luxury_price_low, chp_timestamp, chp_comment , MAX( chp_timestamp ) AS last_updated, MAX( chp_id )
FROM crm_hotel_price
LEFT JOIN crm_destinations ON cde_id = chp_destination
GROUP BY chp_destination, chp_year
ORDER BY chp_id

Answer 1

Try this: (Reference)

$this->db->select('chp_destination, cde_name, chp_year, chp_from, chp_to, chp_budget_price_high, chp_medium_price_high, chp_luxury_price_high, chp_budget_price_low, chp_medium_price_low, chp_luxury_price_low, chp_timestamp, chp_comment, MAX(chp_timestamp) AS last_updated, MAX(chp_id)', FALSE);
$this->db->join('crm_destinations', 'cde_id = chp_destination', 'left');
$this->db->group_by('chp_destination, chp_year');
$this->db->order_by('chp_id');
$qry = $this->db->get('crm_hotel_price');
$res = $qry->result(); // or $qry->result_array();

Answer 2

Try:

$rs = $this->db->select('chp_destination, cde_name, chp_year, chp_from, chp_to, chp_budget_price_high, chp_medium_price_high, chp_luxury_price_high, chp_budget_price_low, chp_medium_price_low, chp_luxury_price_low, chp_timestamp, chp_comment , MAX( chp_timestamp ) AS last_updated, MAX( chp_id )', false)
      ->from('crm_hotel_price')
      ->join('crm_destinations', 'cde_id = chp_destination', 'LEFT')
      ->group_by(array('chp_destination', 'chp_year'))
      ->order_by('chp_id')
      ->get()->result_array();

Answer 3

Please try this code:

 > $this->db->select('chp_destination, cde_name, chp_year, chp_from, chp_to, chp_budget_price_high, 

chp_medium_price_high, chp_luxury_price_high, chp_budget_price_low, chp_medium_price_low, chp_luxury_price_low, chp_timestamp, chp_comment , MAX( chp_timestamp ) AS last_updated, MAX( chp_id )');

$this->db->from('crm_hotel_price');
$this->db->join('crm_destinations','cde_id = chp_destination','LEFT'); // join with another table
$this->db->group_by('chp_destination,chp_year'); // for grouping of field
$this->db->order_by("chp_id", "asc"); // for sorting field value
$query = $this->db->get();
return $query->result_array(); // It will return result
and use this line to view whole SQL query.
echo $this->db->last_query();