javascript - 使用过滤器时 Datatables codeigniter 不起作用

Question

我在 codeigniter 中向我的模型写入查询，当通过 ajax 访问时它返回错误 HTTP 500，但是当使用浏览器时它没有 HTTP 错误代码:

 $query = 'select album.id,
                  album.name,
                  artist.name as artist,
                  artist.name as artistid,
                  album.photo,
                  album.active,
                  album.reasonactive from ' . $this->table . 
                  ' join artist on artist.id = album.ref_artist ';
      if(isset($_POST["search"]["value"])){
         $query .= '(artist.name LIKE "%'.$_POST["search"]["value"].'%" ';
         $query .= 'OR album.name LIKE "%'.$_POST["search"]["value"].'%" ';
      }
      if(isset($_POST["order"])){
         $query .= 'ORDER BY '.$column[$_POST['order']['0']['column']].' '.$_POST['order']['0']['dir'].' ';
        }
        else
        {
         $query .= ' ORDER BY album.name asc ';
        }
        if($_POST['length'] != -1)
           $query .= 'LIMIT ' . $_POST['start'] . ', ' . $_POST['length'];
        $result = $this->db->query($query);
        return $result->result();

这是我的 ajax 代码:

$(document).ready(function() {
  table = $('#table').DataTable({

      "processing": true, //Feature control the processing indicator.
      "serverSide": true, //Feature control DataTables' server-side processing mode.
      "order": [], //Initial no order.

      // Load data for the table's content from an Ajax source
      "ajax": {
          "url": "<?php echo base_url('Manage/get_all')?>",
          "type": "POST"
      },

      //Set column definition initialisation properties.
      "columnDefs": [
          {
              "targets": [ 0 ], //first column
              "orderable": false, //set not orderable
          },
          {
              "targets": [ -1 ], //last column
              "orderable": false, //set not orderable
          },

      ],

  });

但是当我更改并删除过滤器查询时:

   $query = 'select album.id,
                        album.name,
                        artist.name as artist,
                        artist.name as artistid,
                        album.photo,
                        album.active,
                        album.reasonactive from ' . $this->table . ' join artist on artist.id = album.ref_artist ';

代码运行成功。

在我的 codeigniter 消息中:

Notice: Undefined index: length

Notice: Undefined index: start

Notice: Undefined index: draw

当我显示 $_POST 时:

{"draw":null,"recordsTotal":2,"recordsFiltered":2,"data":[]}

我该如何解决这个问题？非常感谢您在这件事上的时间和帮助。

Answer 1

您的查询有问题，因此出现 500 错误:

在您的 if 子句中，您缺少右括号“)”，它应该是

if(isset($_POST["search"]["value"])){
   $query .= ' (artist.name LIKE "%'.$_POST["search"]["value"].'%" ';
   $query .= ' OR album.name LIKE "%'.$_POST["search"]["value"].'%" )';
}

关于如何调试的帮助:

您始终可以打印您的最后一个查询并使用例如php管理员:

echo ($this->db->last_query());die();

在您的根 index.php 中替换以下内容，在任何环境中打开错误报告:

define('ENVIRONMENT', isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] : 'development');

用这行代码

define('ENVIRONMENT', 'development');

这使您能够在浏览器的开发控制台中看到更多决定性的错误消息