Codegnitorppt

Submitted By
Reshma vijayan .R

 Introduction
 Why Framework not Scratch?
 MVC ( Model View Controller) Architecture
 What is CodeIgniter ????
 Application Flow of CodeIgniter
 CodeIgniter URL
 Controllers
 Views
 Models
 CRUD operations
 Session starting
 Form validation
 Q/A
 Reference

 Key Factors of a Development
 Interface Design
 Business Logic
 Database Manipulation
 Advantage of Framework
 Provide Solutions to Common problems
 Abstract Levels of functionality
 Make Rapid Development Easier
 Disadvantage of Scratch Development
 Make your own Abstract Layer
 Solve Common Problems Yourself
 The more Typing Speed the more faster

 Separates User Interface From Business Logic
 Model - Encapsulates core application data and functionality Business
Logic.
 View - obtains data from the model and presents it to the user.
 Controller - receives and translates input to requests on the model or the
view
Figure : 01

 An Open Source Web Application Framework
 Nearly Zero Configuration
 MVC ( Model View Controller ) Architecture
 Multiple DB (Database) support
 Caching
 Modules
 Validation
 Rich Sets of Libraries for Commonly Needed Tasks
 Has a Clear, Thorough documentation

Figure : 2 [ Application Flow of CodeIgniter]

URL in CodeIgniter is Segment Based.
www.your-site.com/news/article/my_article
Segments in a URI
www.your-site.com/class/function/ID
CodeIgniter Optionally Supports Query String URL
www.your-site.com/index.php?c=news&m=article&ID=345

A Class file resides under “application/controllers”
www.your-site.com/index.php/first
<?php
class First extends CI_Controller{
function First() {
parent::Controller();
}
function index() {
echo “<h1> Hello CUET !! </h1> “;
}
}
?>
// Output Will be “Hello CUET!!”
• Note:
• Class names must start with an Uppercase Letter.
• In case of “constructor” you must use “parent::Controller();”

In This Particular Code
www.your-site.com/index.php/first/bdosdn/world
<?php
class First extends Controller{
function index() {
echo “<h1> Hello CUET !! </h1> “;
}
function bdosdn( $location ) {
echo “<h2> Hello $location !! </h2>”;
}
}
?>
// Output Will be “Hello world !!”
• Note:
• The ‘Index’ Function always loads by default. Unless there is a second
segment in the URL

 A Webpage or A page Fragment
 Should be placed under “application/views”
 Never Called Directly
10
web_root/myci/system/application/views/myview.php
<html>
<title> My First CodeIgniter Project</title>
<body>
<h1> Welcome ALL … To My .. ::: First Project ::: .
. . </h1>
</body>
</html>

Calling a VIEW from Controller
$this->load->view(‘myview’);
Data Passing to a VIEW from Controller
function index() {
$var = array(
‘full_name’ => ‘Amzad Hossain’,
‘email’ => ‘tohi1000@yahoo.com’
);
$this->load->view(‘myview’, $var);
}
<html>
<title> ..::Personal Info::.. </title>
<body>
Full Name : <?php echo $full_name;?> <br />
E-mail : <?=email;?> <br />
</body>
</html>

Designed to work with Information of Database
Models Should be placed Under “application/models/”
<?php
class Mymodel extend Model{
function Mymodel() {
parent::Model();
}
function get_info() {
$query = $this->db->get(‘name’, 10);
/*Using ActiveRecord*/
return $query->result();
}
}
?>
Loading a Model inside a Controller
$this->load->model(‘mymodel’);
$data = $this->mymodel->get_info();

CRUD OPERATIONS IN MVC
➢Create
➢Read
➢Update
➢Delete

DATABASE CREATION
//Create
CREATE TABLE ùser` (
ìd` INT( 50 ) NOT NULL AUTO_INCREMENT
,
ùsername` VARCHAR( 50 ) NOT NULL ,
èmail` VARCHAR( 100 ) NOT NULL ,
`password` VARCHAR( 255 ) NOT NULL ,
PRIMARY KEY ( ìd` )
)

DATABASE CONFIGURATION
Open application/config/database.php
$config['hostname'] = "localhost";
$config['username'] = "root";
$config['password'] = "";
$config['database'] = "mydatabase";
$config['dbdriver'] = "mysql";

CONFIGURATION
Then open application/config/config.php
$config['base_url'] = 'http://localhost/ci_user';
Open application/config/autoload.php
$autoload['libraries'] = array('session','database');
$autoload['helper'] = array('url','form');
Open application/config/routes.php, change
default controller to user controller

Creating our view page
Create a blank document in the views file (application ->
views) and name it Registration.php /Login.php
Using HTML and CSS create a simple registration
form

public function add_user()
{
$data=array
(
'FirstName' => $this->input-
>post('firstname'),
'LastName'=>$this->input-
>post('lastname'),
'Gender'=>$this->input->post('gender'),
'UserName'=>$this->input-
>post('username'),
'EmailId'=>$this->input->post('email'),
'Password'=>$this->input-
>post('password'));
$this->db->insert('user',$data);
}

//select
public function doLogin($username, $password)
{
$q = "SELECT * FROM representative WHERE
UserName= '$username' AND Password =
'$password'";
$query = $this->db->query($q);
if($query->num_rows()>0)
{
foreach($query->result() as $rows)
{
//add all data to session
$newdata = array('user_id' => $rows-
>Id,'username' => $rows->UserName,'email' => $rows-
>EmailId,'logged_in' => TRUE);
}
$this->session->set_userdata($newdata);
return true;
}
return false;
}

//Update
$this->load->db();
$this->db->update('tablename',$data);
$this->db->where('id',$id);
//delete
$this->load->db();
$this->db->delete('tablename',$data);
$this->db->where('id',$id);

SESSION STARTING
<?php
Session start();
$_session['id']=$id;
$_session['username']=$username;
$_session['login true']='valid';
if($-session['login true']=='valid')
{
$this->load->view('profile.php');
}
else
{
$this->load->view('login.php');
}

FORM VALIDATION
public function registration()
{
$this->load->library('form_validation');
// field name, error message, validation rules
$this->form_validation->set_rules('firstname', 'First
Name', 'trim|required|min_length[3]|xss_clean');
$this->form_validation->set_rules('lastname', 'Last
Name', 'trim|required|min_length[1]|xss_clean');
$this->form_validation->set_rules('username', 'User
Name','trim|required|min_length[4]|xss_clean|
is_unique[user.UserName]');
}

if($this->form_validation->run() == FALSE)
{
$this->load->view('Register_form');
}
else
{
$this->load->model('db_model');
$this->db_model->add_user();
}

USEFUL LINKS
 www.codeigniter.com

 User Guide of CodeIgniter
 Wikipedia
 Slideshare

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