使用codeigniter的CRUD操作

Question

我在CODEIGNITER中完成了这个CRUD操作。但是，当我尝试运行该程序时，我得到一个空白页面。而且我无法知道错误是什么。任何帮助，将不胜感激。我已附上以下代码。

Stud_controller.php`

  <?php
  defined('BASEPATH') OR exit('No direct script access allowed');

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(){

    $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);
  }
 }
?>`

Stud_Model.php

<?php

Class Stud_Model extends CI_Model {

    function __construct(){
        parent:: __construct();
    }

    public function insert($data) {
        if($this->db->insert("stud", $data)){
            return true;
        }
    }

    public function delete($Roll_No){
        if($this->db->delete("stud", "Roll_No = " .$Roll_No)){
            return true;
        }
    }

    public function update($data,$old_Roll_No){
        $this->db->set($data);
        $this->db->where("Roll_No", $old_Roll_No);
        $this->db->update("stud", $data);
    }
}

?>

Stud_view.php

<html>
<head>
<title>Student</title>
</head>
<body>
<a href = '<?php echo base_url(); ?>
index.php/stud/add_view">Add</a>

<table border = "1">
<?php
    $i = 1;
    echo "<tr>";
    echo "<td>Sr#</td>";
    echo "<td>Roll No.</td>";
    echo "<td>Name</td>";
    echo "<td>Edit</td>";
    echo "<td>Delete</td>";
    echo "</tr>";

    foreach($records as $r){
        echo "<tr>";
        echo "<td>".$i++."</td>";
        echo "<td>".$r->Roll_No."</td>";
        echo "<td>".$r->Name."</td>";
        echo "<td><a href = '".base_url()."index.php/stud/edit/"
              .$r->Roll_No."'>Edit</a></td>"; 
        echo "<td><a href = '".base_url()."index.php/stud/delete/"
              .$r->Roll_No."'>Delete</a></td>"; 
        echo "<tr>"; 

    }
    ?>
    </table>
  </body>
  </html>

Answer 1

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Answer 2

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Answer 3

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