Conclusion of CRUD operation in codeigniter 4

We discuss the things we covered in this course, The CRUD operation in Codeigniter 4 with Bootstrap 4. We give you an overview of the entrire system which you have created in this series.

Here is your whole controller for the CRUD application in Codeigniter 4

<?php
namespace AppControllers;
use AppModelsMyStudents;
use CodeIgniterConfigConfig;
use CodeIgniterController;
class Students extends Controller
{

  public function index()
  {
    $session = ConfigServices::session();
    $message = $session->getFlashdata('message');
    $std = new MyStudents();
    $data['students'] = $std->findAll();
    $pager = ConfigServices::pager();
    $data['message'] = $message;
    echo view('students',$data);

    //var_dump($results);
    //echo 'index Students';
  }

  public function newstudent()
  {
    echo view('newstudent');
    //echo ' new method';
  }

  public function addstudent()
  {
    $request = ConfigServices::request();
    $session = ConfigServices::session();
    $name  = $request->getPost('std');
    $subject  = $request->getPost('subject');
    $newStudent = [
      's_name'=>$name,
      's_subject'=>$subject,
    ];
    $std = new MyStudents();
    $result = $std->insert($newStudent);
    if ($result) {
      $session->setFlashdata('message','You have successfully inserted the student.');
    }
    else{
      $session->setFlashdata('message','Oops something went wrong please try again.');
    }
    return redirect()->to(site_url('students'));
    //var_dump($result);
    //echo 'working..';
  }

  public function editstudent($userId =  null)
  {
    $session = ConfigServices::session();
    if (!empty($userId)) {
      $std = new MyStudents();
      $result = $std->where('s_id',$userId)->findAll();
      if (count($result) > 0) {
        $data['student'] = $result;
        echo view('editStudent',$data);
      }
      else{
        $session->setFlashdata('message','The Student is not exist');
        return redirect()->to(site_url('students'));
      }
    }
    else{
      $session->setFlashdata('message','The id is not available, please try again.');
      return redirect()->to(site_url('students'));
    }

  }

  public function updatestudent()
  {
    $request = ConfigServices::request();
    $session = ConfigServices::session();
    $name  = $request->getPost('std');
    $subject  = $request->getPost('subject');
    $studentId  = $request->getPost('id');

    $updateStudent = [
      's_name'=>$name,
      's_subject'=>$subject,
    ];
    //echo $studentId;
    //die();
    $std = new MyStudents();
    $result = $std->update($studentId,$updateStudent);
    if ($result) {
      $session->setFlashdata('message','You have successfully updated the student.');
    }
    else{
      $session->setFlashdata('message','Oops something went wrong please try again.');
    }
    return redirect()->to(site_url('students'));
  }

  public function delete($userId)
  {
    $session = ConfigServices::session();
    if (!empty($userId)) {
      $std = new MyStudents();
      $result = $std->where('s_id',$userId)->findAll();
      if (count($result) > 0) {
        //$result = $std->delete($userId);
        $result = $std->where('s_id',$userId)->delete();
        if ($result){
          $session->setFlashdata('message','You have successfully deleted.');
          return redirect()->to(site_url('students'));
        }
        else{
          $session->setFlashdata('message','You can't delete the student right now.');
          return redirect()->to(site_url('students'));
        }
      }
      else{
        $session->setFlashdata('message','The Student is not exist');
        return redirect()->to(site_url('students'));
      }
    }
    else{
      $session->setFlashdata('message','The id is not available, please try again.');
      return redirect()->to(site_url('students'));
    }
  }
}//class