500个内部服务器错误ajax数据表codeigniter（数据库查询）

Question

我尝试了另一个问题的答案，但我真的不知道如何解决我的代码。...请帮助解决此问题。

我想显示从mysql数据库到datatables的数据，当我显示所有数据时，它的工作确实很好，但是当我使用where子句时，它显示500个内部服务器错误。

这是我的观点

                   <div class="card-body">
                    <div class="table-responsive">                       
                      <table id="orgAkt_data" class="table table-striped table-hover">
                        <thead>
                          <tr>
                            <th>#</th>
                            <th>Name</th>
                            <th>Place</th>
                            <th>Category</th>
                          </tr>
                        </thead>        
                      </table>
                    </div>
                  </div>
                  <script>
                    $(document).ready(function(){  
                      var dataTable = $('#okas_data').DataTable({  
                         "processing":true,  
                         "serverSide":true,  
                         "order":[],  
                         "ajax":{  
                              url:"<?php echo base_url() . 'PruCtrl/fetch_okastable'; ?>",  
                              type:"POST"  
                         },  
                         "columnDefs":[{    
                            "orderable":false,  
                          },  
                        ],  
                      });
                    </script>

这是我的控制器

 function fetch_okastable(){  
$id_p = $this->session->userdata("id_p"); 
$load_data = $this->Pru_model->make_okas_tables($id_p);  
$data = array();  
$no = 1;
foreach($load_data as $row){  

  $sub_array[] = $no++;  
  $sub_array[] = $row->name;
  $sub_array[] = $row->place;
  $sub_array[] = $row->category;
  $sub_array[] = '<button type="button" name="update" id="'.$row->id.'" class="btn btn-warning btn-xs">Update</button>';
  $sub_array[] = '<button type="button" name="delete" id="'.$row->id.'" class="btn btn-danger btn-xs delete"> <i class="fa fa-trash"></i></button>'; 
  $data[] = $sub_array;  
}  
$output = array(  
  "draw"                    =>     intval($_POST["draw"]),  
  "recordsTotal"            =>      $this->Pru_model->get_all_data(),  
  "recordsFiltered"         =>     $this->Pru_model->get_filtered_org(),  
  "data"                    =>     $data  
);  
echo json_encode($output);  

}

这是我的ci模型

 var $okas_table = "okas_table";
var $select_column = array("id","id_p","name","place","category","img");
var $order_column =  array(null,"id_p","name","place","category",null); 
function make_query_okas($id_p){  
       $this->db->select($this->select_column);  
       $this->db->from($this->org_akt_table); 
       $this->db->where("id_p",$id_p); 
       if(isset($_POST["search"]["value"]))  
       {  
            $this->db->like("id",$_POST["search"]["value"]);
            $this->db->or_like("name", $_POST["search"]["value"]);  
            $this->db->or_like("place", $_POST["search"]["value"]);
            $this->db->or_like("category", $_POST["search"]["value"]);  
       }  
       if(isset($_POST["order"]))  
       {  
            $this->db->order_by($this->order_column[$_POST['order']['0']['column']], $_POST['order']['0']['dir']);  
       }  
       else  
       {  
            $this->db->order_by('id', 'DESC');  
       }
}
function make_okas_tables($nim){  
  $this->make_query_okas($nim);  
  if($_POST["length"] != -1)  
       {  
            $this->db->limit($_POST['length'], $_POST['start']);  
       }  
       $query = $this->db->get();  
       return $query->result();  
} 
function get_filtered_okas(){  
       $this->make_query_okas();  
       $query = $this->db->get();  
       return $query->num_rows();  
}
function get_all_data(){  
       $this->db->select("*");  
       $this->db->from($this->okas_table);  
       return $this->db->count_all_results();  
}