php - 如何减少mysql、codeigniter数据的加载时间

Question

我有大约 400 多条记录要从此方法检索，加载页面几乎需要 2 分钟。所以请帮助我如何减少这个方法的加载时间。

function teacher_attendance_selector()

    {

        $data['year']       = $this->input->post('year');
        $data['timestamp']  =strtotime($this->input->post('timestamp'));
        $query = $this->db->get_where('teacher_attendance' ,array(
                  'teacher_id'=>$data['teacher_id'],
             'year'=>$data['year'],

        ));



        if($query->num_rows() < 1) {
            $teachers = $this->db->get_where('teacher' , array(

            ))->result_array();

            foreach($teachers as $row) {
                $attn_data['year']       = $data['year'];
                $attn_data['timestamp']  = $data['timestamp'];
                $attn_data['teacher_id'] = $row['teacher_id'];

                $this->db->insert('teacher_attendance' , $attn_data);  
            }

        }
  redirect(base_url().'index.php?admin/manage_teacher_attendance_view/'.$data['timestamp'],'refresh');
        }

Answer 1

您的插入查询花费了很长时间。按照下面建议的方式，您可以将所有数据存储在一个数组中，然后只需使用一个查询即可插入该数组中存储的所有记录。

请参阅下面的代码，您将获得更多如何实现性能的想法。

function teacher_attendance_selector()

    {

        $data['year']       = $this->input->post('year');
        $data['timestamp']  =strtotime($this->input->post('timestamp'));
        $query = $this->db->get_where('teacher_attendance' ,array(
                  'teacher_id'=>$data['teacher_id'],
             'year'=>$data['year'],

        ));



        if($query->num_rows() < 1) {
            $teachers = $this->db->get_where('teacher' , array())->result_array();

            $arr_batchinsert = array();

            foreach($teachers as $row) {
                $attn_data['year']       = $data['year'];
                $attn_data['timestamp']  = $data['timestamp'];
                $attn_data['teacher_id'] = $row['teacher_id'];
                
                // PREPARE ARRAY FOR BATCH INSERT
                $arr_batchinsert = $attn_data;
            }

            // insert here using insert_batch
            $this->db->insert_batch('teacher_attendance', $arr_batchinsert ); 


        }
  redirect(base_url().'index.php?admin/manage_teacher_attendance_view/'.$data['timestamp'],'refresh');
        }