PHP/MySQL 尝试在 Codeigniter 中输出单个结果

我是codeigniter的新手，并试图将百分比结果输出到我的项目的codeigntier视图中。一旦我解决了这个问题，事情就会顺利得多。他是模型函数：

<?php
public function _construct()
{
    $this->load->database();
}
public function percent_specilation1($numstudent)
{
    $query = $this->db->query("SELECT * FROM Student WHERE Student.JRNOption ='1'");
    $numstudent = $query->num_rows()/25; 
    if($query->num_rows() > 0){
        return $numstudent;
    }
    return null; 
}
?>

这是控制器。

<?php
class Statscontroller extends CI_Controller {
public function _contruct(){
    parent::_construct();
    $this->load->model('Stats_model');
}
public function index(){
    //echo "Various stats for the Journalism department:";
    $data['Test'] = $this->Stats_model->percent_specilation1($numstudent);
  }
   public function view($page = 'Statsview')
      {
            if ( ! file_exists(APPPATH.'views/pages/'.$page.'.php'))
            {
                    // Whoops, we don't have a page for that!
                    show_404();
            }
            //$data['title'] = ucfirst($page); 
           $this->load->view('templates/header',$data);
   $this->load->view('Statscontroller/index',$data);
   $this->load->view('templates/header');
    }
 ?>
  Here is the view
   <html>
   <h1> Various Statistics for the Journalism department</h1>
   <?php
  echo "Percent of students that are undecided:";   
  echo $Test; ?>
   </html>

我做错了什么？一个多小时以来，我一直在尝试正确处理它，我只想从数据库查询中输出单个结果。你能提供的任何帮助都会很棒。请尊重。谢谢！

尝试此代码，我已经更新了控制器和模型的一些代码，并使用student表的主键在模型查询中student_id。

更新模型：

<?php
public function _construct()
{
    $this->load->database();
}
public function percent_specilation1()
{
    $query = $this->db->query("SELECT (SELECT COUNT(s2.student_id) 
            FROM Student s2
            WHERE s2.JRNOption='1')*100/COUNT(s1.student_id) AS percentage
            FROM Student s1");
    $result = $query->row_array(); 
    return $result['percentage']; 
}
?>

更新的控制器：

<?php
class Statscontroller extends CI_Controller {
    public function _contruct(){
        parent::_construct();
        $this->load->model('Stats_model');
    }
    public function index(){
        //echo "Various stats for the Journalism department:";
        $data['Test'] = $this->Stats_model->percent_specilation1();
        $this->load->view('templates/header',$data);
        $this->load->view('Statscontroller/index',$data);
        $this->load->view('templates/header');
    }

}
?>

希望这对您有所帮助。

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