Codeigniter中的模型無法識別ID號

Question

所以這是錯誤：

A PHP Error was encountered

Severity: Notice

Message: Undefined variable: idnum

Filename: models/model_teacher.php

Line Number: 8

這是我的控制器：

 public function teacher(){

   $this->load->model('model_teacher');

   $data['result'] = $this->model_teacher->scoreboard();
   $this->load->view('teacher/teacher', $data);
  }

和我的模型：

 class Model_teacher extends CI_Model {

    public function scoreboard() {

        $this->db->where('login_id', $this->input->post('idnum'));
        $query = $this->db->query("SELECT * FROM teacher WHERE login_id = '".$idnum."'");
        return $query->result();

        }
} 

和視圖：

<?php
  foreach ($result as $row) {
            echo $row->login_id."<br>";
            echo $row->lname."<br>";
        }
?>

而且不知道這段代碼有什么問題。 請多多包涵，我仍然是使用Codeigniter的新手。 多謝你們。

Answer 1

更改如下：

在控制器中

 public function teacher(){
   $this->load->model('model_teacher');
   $idNum = $this->input->post('idnum');
   $data['result'] = $this->model_teacher->scoreboard($idNum);
   $this->load->view('teacher/teacher', $data);
  }

在模型中

   public function scoreboard($idNum) {
      $this->db->where('login_id', $idNum);
      $query = $this->db->query("SELECT * FROM teacher WHERE login_id = '".$idnum."'");
      return $query->result();
   }

Answer 2

如果將它從控制器傳遞到模型會更好

$id = $this->input->post('idnum');
$data['result'] = $this->model_teacher->scoreboard($id);

和型號：

public function scoreboard($id) {
  //$this->db->where('login_id', $id);
  $query = $this->db->query("SELECT * FROM teacher WHERE login_id = '".$id."'");
  return $query->result();
}

另外，您還沒有在$idnum定義任何位置，因此出現通知

Answer 3

您不能直接進入模型，而必須首先進入控制器

   public function teacher(){
$id  = $this->input->post('idnum');

   $this->load->model('model_teacher');

   $data['result'] = $this->model_teacher->scoreboard($id);
   $this->load->view('teacher/teacher', $data);
  }

模型 `

public function scoreboard($idnum) {

    $query = $this->db->query("SELECT * FROM teacher WHERE login_id = '".$idnum."'");
    return $query->result();

    }`

這是您可以使用的代碼