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Database connectivity from MySQL to CI?
.........................................................................................

steps1st:-

create database and table from MySQL database using PHPMyAdmin

step2nd:-

open project folder and edit config/database.php

and edit username, password, database

username='root'
password=' '
database= 'dbname'

step3rd:-

create controller and load view and create an action method in the controller

step4th

create view form according to the table in the view file

step5th

create a model class and define a method for data insertion under the model folder

class Modelname extends CI_Model
{
      function methodname()
      {

      }   

}


step6:-

load database.php file under model class constructor

function __construct()
{
   parent::__construct();
   $this->load->database();
}

step7:-

create a method on the model and write data insertion code

step8:-

call model method from the controller action method.

first load model then call a model class method

$this->load->model('modelname');
$this->modelname->method(param,..)

Show record
9) create another method in the controller and load view

10) create another method in the model and write data selection code

11) call a model method from the controller

12) send model data into view from the controller


Complete Code for Data Operation

Code of Database.php what will be changed:
'hostname' => 'localhost',
'username' => 'root',
'password' => '',
'database' => 'phpdb2',

Code of Controller:-

<?php
class Student extends CI_Controller
{

function index()
{

$this->load->view('stuview');
}

    function stuadd()
    {
    $this->load->model('Stumodel');
    $r = $this->input->post('txtrno');
    $s = $this->input->post('txtname');
    $b = $this->input->post('txtbranch');
    $f = $this->input->post('txtfees');
    $res=$this->Stumodel->stuinsert($r,$s,$b,$f);
    if($res==1)
    $data['res']= "data inserted successfully";
    else
    $data['res']= "problem in insertion";
    $this->load->view('stuview',$data);
    }
    function stushow()
    {
    $this->load->model('Stumodel');
    $data['res']=$this->Stumodel->showstudent();
    $this->load->view('viewstudent',$data);
    }

}


?>

.............................................*....................................................................
Code of View:-
....................................................................................................
stuview.php

<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<h1>Welcome in Student Information</h1>

<form action="<?php echo site_url(); ?>/Student/stuadd" method="post">

<input type="text" name="txtrno" placeholder="enter rno" />
<br>
<br>
<input type="text" name="txtname" placeholder="enter name" />
<br>
<br>
<input type="text" name="txtbranch" placeholder="enter branch" />
<br>
<br>
<input type="text" name="txtfees" placeholder="enter fees" />
<br>
<br>
<input type="submit" name="btnsubmit" value="Insert" />
</form>
<?php
echo @$res;
?>
</body>
</html>

Code for Display View:-
viewstudent.php

<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<center>
<h1>Student Information</h1>
<?php
//print_r($res);
echo "<table border='1'><tr><th>Rno</th><th>Sname</th><th>Branch</th><th>Fees</th></tr>";
foreach($res as $k)
{
echo "<tr>";
foreach ($k as $v) {
echo "<td>$v"."</td>";
}
echo "</tr>";
}
echo "</table>";
?>
</center>
</body>
</html>

Code of Complete Model Class:-
<?php
class Stumodel extends CI_Model
{
    function __construct()
    {
    parent::__construct();
    $this->load->database();
    }

    function stuinsert($r,$s,$b,$f)
    {
    $this->db->insert('student',array('rno'=>$r,'name'=>$s,'branch'=>$b,'fees'=>$f));
    return $this->db->affected_rows();
    }
    function showstudent()
    {
    $res = $this->db->get('student');
    return $res->result_array();
    }

}





?>

Database Schema:-




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