Codeigniter按时间排序-查询生成

Question

I actually need a mysql query like

SELECT *, CONCAT(pri_hours, ':', pri_minutes, ' ', IF(pri_ampm = 1, 'am', 'pm')) as hr FROM (`sms_primary`)  ORDER BY STR_TO_DATE(hr, '%h:%i %p')

and as I use codeigniter i wrote query as below

       $this->db->select("*,CONCAT(pri_hours,':', pri_minutes,' ',IF(pri_ampm = 1,'am','pm')) as hr",FALSE);
       $this->db->from('sms_primary');
       $this->db->order_by("STR_TO_DATE(hr,'%h:%i %p')");

But i am not getting the expected query i get it as below

SELECT *, CONCAT(pri_hours, ':', pri_minutes, ' ', IF(pri_ampm = 1, 'am', 'pm')) as hr FROM (`sms_primary`) ORDER BY STR_TO_DATE(hr, `'%h:%i` %p') 

I hope you spot out the difference in the generated query. Its a injection off some unwanted operator `. I just want to remove it.How to do that?

Change

STR_TO_DATE(hr, `'%h:%i` %p') 

to

 STR_TO_DATE(hr, '%h:%i %p')

Answer 1

codeigniter is adding backticks. use this before your query

$this->db->_protect_identifiers=false; 

hope this helps

Answer 2

You require to use this->db->_protect_identifiers=false;

In your query,it should be like :

$this->db->_protect_identifiers = FALSE; // Make it false here $this->db->order_by("STR_TO_DATE(hr,'%h:%i %p')");
$this->db->_protect_identifiers = TRUE; // Make it true again when order_by code completed