php / mysql試圖在codeigniter中輸出單個結果？
[英]php/mysql trying to output a single result in codeigniter?
問題描述
我是codeigniter的新手，並嘗試將百分比結果輸出到我的項目的codeigntier視圖中。 一旦我解決了這個問題，事情就會變得更順暢。 他是模特的職能：
<?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;
}
?>
這是控制器。
<?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>
我究竟做錯了什么？ 我一直試圖讓它正確超過一個小時，我只想輸出數據庫查詢中的單個結果。 你能提供的任何幫助都會很棒..請尊重。 謝謝！
1 個解決方案
解決方案1
0 2017-04-12 04:09:15
試試這段代碼，我更新了一些控制器和模型的代碼，並在模型查詢中使用student table的主鍵for student_id 。
更新型號：
<?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');
}
}
?>
希望這會幫助你。
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