codeigniter中的列总和

Question

遇到PHP错误 严重性：注意 消息：尝试获取非对象的属性

$query = $this->db->query("Select count(id) as count From `bookings` where status=6");
$row = $query->row('bookings');
echo $row->count;

Answer 1

检查此代码，它将返回所有行号，如果未找到任何数据，则返回未找到的数据。

$query = $this->db->query("select count(id) as count From bookings where status=6");
  if($query->num_rows() > 0 )
  {
     $row =  $query->row();
     echo  $row->count; // return the count
  } else {
      echo 'no data found';
  }

或者您可以使用num_rows()

$query = $this->db->query('select count(id) as count From bookings where status=6');
echo $query->num_rows();

希望它会帮助你