Codeigniter 101

Codeigniter 101

#Structure

important folder inside application folder

1)model folder

2)view folder

3)controller folder

4)config-->routes.php

#Calling Default Controller and its view

1)http://ihostidea.com/ci/

or

2)http://ihostidea.com/ci/index.php/welcome

//To create own Controller

Site.php    #inside application/controller folder

class Site extends CI_Controller {

function index(){

echo "Hello Site index";

}

}

?>

//Calling of Site Controller

http://ihostidea.com/ci/index.php/site

//creating  constructor method

class Site extends CI_Controller {

function index(){

echo "Hello Site index";

}

function myMethod(){

echo "Hello from myMethod";

}

}

?>

//Calling MyMethod

http://ihostidea.com/ci/index.php/site/mymethod

//To change default controller

config->route.php

$route['default_controller'] = "site";

//After changing Site can be called directly

http://ihostidea.com/ci/

Note: 1)name of controller class  must start with upper case

        2)controller file name must be same as of controller class name

//Creating view

//create myView.php file in application/view folder

  
    
  

  
     My View  
  

//loading view via controller constructor method

Syntax :
  $this->load->view('directory-name/name');

Site.php code

class Site extends CI_Controller {
function index(){
echo "Hello Site index";
}
function myMethod(){

  $this->load->view('myView');
}
}

?>

//calling myView method

http://ihostidea.com/ci/index.php/site/mymethod

//Creating model

Math.php inside application/model folder

class Math extends CI_Model{

public function add(){

echo 2+3;

}

}

?>

// To call math model inside controller->myMethod

function myMethod(){

  //$this->load->view('myView');
 $this->load->model('math');
  echo $this->math->add();
}

//To pass data from controller to view

function myMethod(){    //Controller method

$data['title']='My Site';

$this->load->view('myView,$data);

}

//Basic Calculator controller passes data to model model adds and subtracts and then views shows the result

out put

5+2=7

5-2=3

// Controller  Site.php

function myMethod(){

$data['title']='My Site';

$data['var1']=5;

$data['var2']=2;

$this->load->model('math');

$data['add']=$this->math->add($data['var1'],$data['var2']);

$data['sub']=$this->math->sub($data['var1'],$data['var2']);

$this->load->view('myView,$data);

}

}

// Views : myView.php

echo "Output";

echo "$var1+$var2=$add";

echo "$var1-$var2=$sub";

?>

//Models : math.php

class Math extends CI_Model{

public function add($x,$y){

return $x+$y;

}

public function sub($x,$y){

return $x-$y;

}

}

//Assignment

function index()

{

$data['title'] = "My Web Page";

$this->load->view('header', $data);

$this->load->view('navigation');

$this->load->view('content');

$this->load->view('footer');

}

//Now create Home and Aboutus Controller and Views

Changes in view_home.php and about_us.php

Home

About us

To remove index.php from middle

GoTo  https://ellislab.com/forums/viewthread/179699/

Step 1.    update system/.htaccess file

with here is my htaccess configuration  and do update

  RewriteEngine On

  RewriteBase /c_intro/

….. rest all same

Step 2. do rewrite module on

Step 3.  Goto config.php

$config['index_page'] = '  ';// Remove index.php

//Database

Goto Config folder-> autoload.php

Do changes

Step 1.$autoload['libraries'] = array('database');// Now database will be load automatically

Step 2. Goto config->database.php

         provide username and password

$db['default']['hostname'] = 'localhost';

$db['default']['username'] = 'root';

$db['default']['password'] = '';

$db['default']['database'] = 'my_db';

//Getting values from database

//output

a@gmail.com1234

b@gmail.com1234

Controller Name= view

Controller : get_info()

function get_info(){

$this->load->model('get_db');

$data['result']=$this->get_db->get();

$this->load->view('view_db',$data);

}

Model: get_db

class Get_db extends CI_Model{

public function get(){

   $query=$this->db->query('select * from info');

return $query->result();

}

}

views: view_db

//print_r($result);

foreach($result as $row){

echo $row->emailid;

echo $row->password;

echo "

";

}

?>

//Insert into database

Controller:

function insert_info(){

$this->load->model('get_db');

$newRow=array('emailid'=>'c@gmail.com','password'=>'1234');

$this->get_db->insert1($newRow);

}

Model:

public function insert1($data){

  $this->db->insert('info',$data);//info is table name  returns true or false

}

Another way to add multiple record

Controller Changes:

$newRow=array(

array('emailid'=>'f@gmail.com','password'=>'1234'),

array('emailid'=>'g@gmail.com','password'=>'1234')

);

Model Changes: get_db

$this->db->insert_batch('info',$data)

Updating Values

To change password where email id like g@gmail.com

Controller:

function update_info(){

$this->load->model('get_db');

$newRow=array('password'=>'g@');//set password g@

$this->get_db->update1($newRow);

}

Model: get_db

public function update1($data){

  if($this->db->update('info',$data,'emailid = "g@gmail.com"'))//info is table name

echo "Record Updated";

}

//Update multiple rows

use update_batch()

Deleting Values

Controller:

function delete_info(){

$this->load->model('get_db');

$newRow=array('emailid'=>'a@gmail.com');//Delete record a@gmail.com

$this->get_db->delete1($newRow);

}

Model: get_db

public function delete1($data){

  if($this->db->delete('info',$data))

echo "Records Deleted";

}

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