Question

我正在学习CodeIgniter，遵循本教程：http://www.tutorialspoint.com/codeigniter/working_with_database.htm 面临以下错误：

遇到PHP错误

严重性：注意

消息：使用未定义的常量roll_no - 假设＆＃39; roll_no＆＃39;

文件名：views / Stud_edit.php

行号：16

回溯：

文件：C：\ xampp \ htdocs \ CI \ CI-1 \ application \ views \ Stud_edit.php   行：16   功能：_error_handler

文件：C：\ xampp \ htdocs \ CI \ CI-1 \ application \ controllers \ Stud_controller.php   行：44   功能：查看

文件：C：\ xampp \ htdocs \ CI \ CI-1 \ index.php   行：315   功能：require_once

这里是我的代码＆＃34; Stud_edit.php＆＃34;

<!DOCTYPE html> 

<html lang = "en">
<head> 
  <meta charset = "utf-8"> 
  <title>Students Example</title> 
  </head> 

  <body> 
  <form method = "" action = "">

     <?php 
        echo form_open('Stud_controller/update_student'); 
        echo form_hidden('old_roll_no',$old_roll_no); 
        echo form_label('Roll No.'); 
        echo form_input(array('id'=>'roll_no','name'=>'roll_no','value'=>$records[0]>roll_no));
        echo "<br/>"; 

        echo form_label('Name'); 
        echo form_input(array('id'=>'name','name'=>'name','value'=>$records[0]->name));
        echo "<br/>"; 

        echo form_submit(array('id'=>'submit','value'=>'Edit')); 
        echo form_close();
     ?> 

  </form>

Stud_controller.php

<?php 
  class Stud_controller extends CI_Controller {

  function __construct() { 
     parent::__construct(); 
     $this->load->helper('url'); 
     $this->load->database(); 
  } 

  public function index() { 
     $query = $this->db->get("stud"); 
     $data['records'] = $query->result(); 

     $this->load->helper('url'); 
     $this->load->view('Stud_view',$data); 
  } 

  public function add_student_view() { 
     $this->load->helper('form'); 
     $this->load->view('Stud_add'); 
  } 

  public function add_student() { 
     $this->load->model('Stud_Model');

     $data = array( 
        'roll_no' => $this->input->post('roll_no'), 
        'name' => $this->input->post('name') 
     ); 

     $this->Stud_Model->insert($data); 

     $query = $this->db->get("stud"); 
     $data['records'] = $query->result(); 
     $this->load->view('Stud_view',$data); 
  } 

  public function update_student_view() { 
     $this->load->helper('form'); 
     $roll_no = $this->uri->segment('3'); 
     $query = $this->db->get_where("stud",array("roll_no"=>$roll_no));
     $data['records'] = $query->result(); 
     $data['old_roll_no'] = $roll_no; 
     $this->load->view('Stud_edit',$data); 
  } 

  public function update_student(){ 
     $this->load->model('Stud_Model');

     $data = array( 
        'roll_no' => $this->input->post('roll_no'), 
        'name' => $this->input->post('name') 
     ); 

     $old_roll_no = $this->input->post('old_roll_no'); 
     $this->Stud_Model->update($data,$old_roll_no); 

     $query = $this->db->get("stud"); 
     $data['records'] = $query->result(); 
     $this->load->view('Stud_view',$data); 
  } 

  public function delete_student() { 
     $this->load->model('Stud_Model'); 
     $roll_no = $this->uri->segment('3'); 
     $this->Stud_Model->delete($roll_no); 

     $query = $this->db->get("stud"); 
     $data['records'] = $query->result(); 
     $this->load->view('Stud_view',$data); 
  } 
} ?>

Answer 1

您的语法有错误..

echo form_input(array('id'=>'roll_no','name'=>'roll_no','value'=>$records[0]>roll_no));

-中缺少$records[0]>roll_no ..

echo form_input(array('id'=>'roll_no','name'=>'roll_no','value'=>$records[0]->roll_no));

使用未定义的常量roll_no - 假设＆＃39; roll_no＆＃39;在codeIgniter中

1 个答案: