Codeigniter 4 CRUD (Create Read Update Delete) Tutorial For Beginners

In this tutorial, We will inform you how to perform crud operation in CodeIgniter 4. Codeigniter 4 CRUD (Create Read Update Delete) Tutorial For Beginners.

if you want to create CRUD operation in CodeIgniter 4, so you can follow the below steps.
Overview
Step 1: Download Codeigniter
Step 2: Basic Configurations
Step 3: Create a Database in table
Step 4: Connect to Database
Step 5: Create Controller and Model
Step 6: Create Views Files
Step 7: Run The Application

Step 1: Download Codeigniter
If you want to download or install CodeIgniter 4 then you can below Url.
How To Install Codeigniter 4 Using Manual, Composer, Git

Step 2: Basic Configurations
If you want to Basic Configurations in your project then you can below Url.
Codeigniter 4 Removing Index.Php From Url

Step 3: Create a Database in table
In this step, We will create the database and table.

CREATE TABLE IF NOT EXISTS `students` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `first_name` varchar(64) NOT NULL,
  `last_name` varchar(64) NOT NULL,
  `address` text NOT NULL,
  `email` varchar(64) NOT NULL,
  `mobile` varchar(12) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=15 ;

CREATE TABLE IF NOT EXISTS `students` (

`id` int(11) NOT NULL AUTO_INCREMENT,

`first_name` varchar(64) NOT NULL,

`last_name` varchar(64) NOT NULL,

`address` text NOT NULL,

`email` varchar(64) NOT NULL,

`mobile` varchar(12) NOT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=15 ;

Step 4: Connect to Database
Go to “app/Config/Database.php” folder and open database.php file some changes in this file like as hostname, database username, database password and database name.

	public $default = [
		'DSN'      => '',
		'hostname' => 'localhost',
		'username' => 'root',
		'password' => '',
		'database' => 'codeigniter4_crud',
		'DBDriver' => 'MySQLi',
		'DBPrefix' => '',
		'pConnect' => false,
		'DBDebug'  => (ENVIRONMENT !== 'production'),
		'cacheOn'  => false,
		'cacheDir' => '',
		'charset'  => 'utf8',
		'DBCollat' => 'utf8_general_ci',
		'swapPre'  => '',
		'encrypt'  => false,
		'compress' => false,
		'strictOn' => false,
		'failover' => [],
		'port'     => 3306,
	];

public $default = [

'DSN' => '',

'hostname' => 'localhost',

'username' => 'root',

'password' => '',

'database' => 'codeigniter4_crud',

'DBDriver' => 'MySQLi',

'DBPrefix' => '',

'pConnect' => false,

'DBDebug' => (ENVIRONMENT !== 'production'),

'cacheOn' => false,

'cacheDir' => '',

'charset' => 'utf8',

'DBCollat' => 'utf8_general_ci',

'swapPre' => '',

'encrypt' => false,

'compress' => false,

'strictOn' => false,

'failover' => [],

'port' => 3306,

];

Step 5: Create Controller and Model
In this step, we will a create “Student.php” controller and “StudentModel.php” model.
app/Controllers/Student.php

<?php namespace App\Controllers;
 
use CodeIgniter\Controller;
use App\Models\StudentModel;
 
class Student extends Controller
{
 
    public function index()
    {    
        $model = new StudentModel();
 
        $data['students_detail'] = $model->orderBy('id', 'DESC')->findAll();
        
        return view('list', $data);
    }    
 
    public function create()
    {    
        return view('add');
    }
 
    public function store()
    {  
 
        helper(['form', 'url']);
         
        $model = new StudentModel();
		
        $data = [
            'first_name' => $this->request->getVar('txtFname'),
            'last_name'  => $this->request->getVar('txtLname'),
            'address'  => $this->request->getVar('txtAddress'),
            'email'  => $this->request->getVar('txtEmail'),
            'mobile'  => $this->request->getVar('txtMobile'),
            ];
        $save = $model->insert($data);
		return redirect()->to( base_url('student') );
    }
 
    public function edit($id = null)
    {
      
     $model = new StudentModel();
 
     $data['student'] = $model->where('id', $id)->first();
 
     return view('edit', $data);
    }
 
    public function update()
    {  
 
		helper(['form', 'url']);
		 
		$model = new StudentModel();

		$id = $this->request->getVar('id');

		 $data = [
			'first_name' => $this->request->getVar('txtFname'),
			'last_name'  => $this->request->getVar('txtLname'),
			'address'  => $this->request->getVar('txtAddress'),
			'email'  => $this->request->getVar('txtEmail'),
			'mobile'  => $this->request->getVar('txtMobile'),
			];

		$save = $model->update($id,$data);

		return redirect()->to( base_url('student') );
    }
 
    public function delete($id = null){
		$model = new StudentModel();
		$data['user'] = $model->where('id', $id)->delete();
		return redirect()->to( base_url('student') );
    }
}

?>

<?php namespace App\Controllers;

use CodeIgniter\Controller;

use App\Models\StudentModel;

class Student extends Controller

{

public function index()

{

$model = new StudentModel();

$data['students_detail'] = $model->orderBy('id', 'DESC')->findAll();

return view('list', $data);

}

public function create()

{

return view('add');

}

public function store()

{

helper(['form', 'url']);

$model = new StudentModel();

$data = [

'first_name' => $this->request->getVar('txtFname'),

'last_name' => $this->request->getVar('txtLname'),

'address' => $this->request->getVar('txtAddress'),

'email' => $this->request->getVar('txtEmail'),

'mobile' => $this->request->getVar('txtMobile'),

];

$save = $model->insert($data);

return redirect()->to( base_url('student') );

}

public function edit($id = null)

{

$model = new StudentModel();

$data['student'] = $model->where('id', $id)->first();

return view('edit', $data);

}

public function update()

{

helper(['form', 'url']);

$model = new StudentModel();

$id = $this->request->getVar('id');

$data = [

'first_name' => $this->request->getVar('txtFname'),

'last_name' => $this->request->getVar('txtLname'),

'address' => $this->request->getVar('txtAddress'),

'email' => $this->request->getVar('txtEmail'),

'mobile' => $this->request->getVar('txtMobile'),

];

$save = $model->update($id,$data);

return redirect()->to( base_url('student') );

}

public function delete($id = null){

$model = new StudentModel();

$data['user'] = $model->where('id', $id)->delete();

return redirect()->to( base_url('student') );

}

app/Models/StudentModel.php

<?php namespace App\Models;
use CodeIgniter\Database\ConnectionInterface;
use CodeIgniter\Model;
 
class StudentModel extends Model
{
    protected $table = 'Students';
 
    protected $allowedFields = ['first_name','last_name','address','email', 'mobile'];
}
?>

<?php namespace App\Models;

use CodeIgniter\Database\ConnectionInterface;

use CodeIgniter\Model;

class StudentModel extends Model

{

protected $table = 'Students';

protected $allowedFields = ['first_name','last_name','address','email', 'mobile'];

}

Step 6: Create Views Files
Finally, we will create the list.php, add.php, and edit.php in the app/views directory.
app/views/list.php

<html>
<head>
	<title>Codeigniter 4 CRUD (Create Read Update Delete) Tutorial For Beginners - XpertPhp</title>
	  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
	  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
	  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script
</head>
<body>
<div style="clear:both; margin-top:0em; margin-bottom:1em;"><a href="https://xpertphp.com/laravel-one-to-many-eloquent-relationship-tutorial-example/" target="_blank" rel="nofollow" class="u57d58a1f659c4fbff4a8645a6650fee9"><style>.u57d58a1f659c4fbff4a8645a6650fee9{padding:0;margin:0;padding-top:1em!important;padding-bottom:1em!important;width:100%;display:block;font-weight:700;background-color:#eaeaea;border:0!important;border-left:4px solid #34495E!important;box-shadow:0 1px 2px rgba(0,0,0,.17);-moz-box-shadow:0 1px 2px rgba(0,0,0,.17);-o-box-shadow:0 1px 2px rgba(0,0,0,.17);-webkit-box-shadow:0 1px 2px rgba(0,0,0,.17);text-decoration:none}.u57d58a1f659c4fbff4a8645a6650fee9:active,.u57d58a1f659c4fbff4a8645a6650fee9:hover{opacity:1;transition:opacity 250ms;webkit-transition:opacity 250ms;text-decoration:none}.u57d58a1f659c4fbff4a8645a6650fee9{transition:background-color 250ms;webkit-transition:background-color 250ms;opacity:1.11;transition:opacity 250ms;webkit-transition:opacity 250ms}.u57d58a1f659c4fbff4a8645a6650fee9 .ctaText{font-weight:700;color:#464646;text-decoration:none;font-size:16px}.u57d58a1f659c4fbff4a8645a6650fee9 .postTitle{color:#000;text-decoration:underline!important;font-size:16px}.u57d58a1f659c4fbff4a8645a6650fee9:hover .postTitle{text-decoration:underline!important}</style><div style="padding-left:1em; padding-right:1em;"><span class="ctaText">See also</span>  <span class="postTitle">Laravel one to many eloquent relationship tutorial example</span></div></a></div>
<table border="1" align="center">
    <tr>
        <td colspan="5" align="right"><a href="<?php echo site_url('student/create') ?>">Add</a></td>
    </tr>

	<tr>
		<td>First Name</td>
		<td>Last Name</td>
		<td>Email</td>
		<td>Mobile</td>
		<td>Action</td>
	</tr>
	<?php
	 foreach($students_detail as $sd){
		?>
		<tr>
			<td><?php echo $sd['first_name']; ?></td>
			<td><?php echo $sd['last_name']; ?></td>
			<td><?php echo $sd['email']; ?></td>
			<td><?php echo $sd['mobile']; ?></td>
			<td><a  href="<?php echo base_url(); ?>/student/edit/<?php echo $sd['id']; ?>">Edit</a>&nbsp;<a  href="<?php echo base_url(); ?>/student/delete/<?php echo $sd['id']; ?>">Delete</a></td>
		</tr>
		<?php
	}
	?>
 </table>
</body>
</html>

<html>

<head>

<title>Codeigniter 4 CRUD (Create Read Update Delete) Tutorial For Beginners - XpertPhp</title>

</head>

<body>

<tr>

</tr>

<tr>

<td>First Name</td>

<td>Email</td>

<td>Mobile</td>

<td>Action</td>

</tr>

<?php

foreach($students_detail as $sd){

<tr>

<td><a href="<?php echo base_url(); ?>/student/edit/<?php echo $sd['id']; ?>">Edit</a> <a href="<?php echo base_url(); ?>/student/delete/<?php echo $sd['id']; ?>">Delete</a></td>

</tr>

<?php

}

</table>

</body>

</html>

app/views/add.php

<form method="post" name="frmAdd" action="<?php echo site_url('student/store');?>">
        <table align="center">
            <tr>
                <td colspan="2" align="center">Add Record</td>
            </tr>

            <tr>
                <td>First Name</td>
                <td><input type="text" name="txtFname"> </td>
            </tr>
            <tr>
                <td>Last Name</td>
                <td><input type="text" name="txtLname"> </td>
            </tr>
            <tr>
                <td>Address</td>
                <td><textarea name="txtAddress" rows="4" cols="16"></textarea> </td>
            </tr>
            <tr>
                <td>Email</td>
                <td><input type="text" name="txtEmail"> </td>
            </tr>
            <tr>
                <td>Mobile</td>
                <td><input type="text" name="txtMobile"> </td>
            </tr>
            <tr>
                <td colspan="2" align="center"><input type="submit" value="Add" name="btnadd"> </td>
            </tr>
        </table>
</form>

<tr>

<td colspan="2" align="center">Add Record</td>

</tr>

<tr>

<td>First Name</td>

</tr>

<tr>

</tr>

<tr>

<td>Address</td>

</tr>

<tr>

<td>Email</td>

</tr>

<tr>

<td>Mobile</td>

</tr>

<tr>

</tr>

</table>

</form>

app/views/edit.php

<form method="post" name="frmEdit" action="<?php echo base_url('student/update');?>">
	<table align="center">
		<tr>
			<td colspan="2" align="center">Edit Record</td>
		</tr>
		<input type="hidden" name="id" class="form-control" id="id" value="<?php echo $student['id'] ?>">
		<tr>
			<td>First Name</td>
			<td><input type="text" name="txtFname" value="<?php echo $student['first_name']; ?>"> </td>
		</tr>
		<tr>
			<td>Last Name</td>
			<td><input type="text" name="txtLname" value="<?php echo $student['last_name']; ?>"> </td>
		</tr>
		<tr>
			<td>Address</td>
			<td><textarea name="txtAddress" rows="4" cols="16"><?php echo $student['address']; ?></textarea> </td>
		</tr>
		<tr>
			<td>Email</td>
			<td><input type="text" name="txtEmail" value="<?php echo $student['email']; ?>"> </td>
		</tr>
		<tr>
			<td>Mobile</td>
			<td><input type="text" name="txtMobile" value="<?php echo $student['mobile']; ?>"> </td>
		</tr>
		<tr>
			<td colspan="2" align="center"><input type="submit" value="Edit" name="btnEdit"> </td>
		</tr>
	</table>
</form>

<tr>

<td colspan="2" align="center">Edit Record</td>

</tr>

<tr>

<td>First Name</td>

</tr>

<tr>

</tr>

<tr>

<td>Address</td>

</tr>

<tr>

<td>Email</td>

</tr>

<tr>

<td>Mobile</td>

</tr>

<tr>

</tr>

</table>

</form>

Step 7: Run The Application
Now we will run our example using the below Url in the browser.

http://localhost/codeigniter4_crud/student

1	http://localhost/codeigniter4_crud/student

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