如何在codeigniter查询中使用FIND_IN_SET？

Question

$array = array('classesID' => 6); 
$this->db->select()->from($this->_table_name)->where($array)->order_by($this->_order_by); 
$query = $this->db->get(); 
return $query->result(); 

我需要获取classesID为6的行。某些行包含6,5,4。 所以我需要使用FIND_IN_SET查询以检索其中classesID是6

请指引我

感谢

Answer 1

你可以写这样的查询。

return $this->db->where('classesID' , '6')->order_by('column_name','desc')->get('table_name')->result_array(); 

如果需要任何帮助评论

Answer 2

试试这个

$array = array('classesID' => '5,6,7'); 
$this->db->select(); 
$this->db->from($this->_table_name); 
$this->db->where("FIND_IN_SET('classesID',".$array['classesID'].")",null,false); 
$this->db->order_by($this->_order_by); 
$query = $this->db->get(); 
return $query->result(); 

Answer 3

我需要得到具有学号 '4488' 和消息ID '1418'

行

$id = 1418; 
$student_id = 4488; 
    this->db->select('id, action_status, updated_on, student_ids'); 
    $this->db->where('message_id', $id); 
    $this->db->where('find_in_set("'.$student_id.'", student_ids) <> 0'); 
    $this->db->from('actions_history'); 
    $query = $this->db->get(); 

它会返回一个查询，如

SELECT id, action_status, updated_on, student_ids FROM actions_history WHERE message_id = '1418' AND find_in_set("4488", student_ids) <>0