php - 在 PHP 中过滤计数

Question

如何在活动记录中转换此代码：

$last_points = mysql_insert_id(); 
$sql = "SELECT COUNT(fkmember) FROM downline WHERE fkmember = {$last_points}"; 

Answer 1

$this->db->select('COUNT(fkmember)');
$query = $this->db->get_where('downline', array('fkmember'=> $last_points))->num_rows();

Answer 2

首先，在使用 COUNT 这样的聚合函数时，建议使用 GROUP BY

$last_points = $this->db->insert_id();

$this->db->from('downline');
$this->db->where('fkmember', $last_points);
$this->db->group_by('fkmember');
echo $this->db->count_all_results();
// Produce an integer, like 17

您也可以参考手册：http ://codeigniter.com/user_guide/database/active_record.html

Answer 3

$last_points = mysql_insert_id(); 

$count = $this->db->where('fkmember',$last_points)->get('downline')->num_rows();

$count 给出结果的计数