how to retrive data from database using codeigniter 2

Blog_view.php
<?php

class Blog_model extends CI_Model
{
    function __construct()
    {
        parent::__construct();
    }
   
public function getall()
{
    $this->load->database();//used to load database
$query=$this->db->get('student_details');//used to fetch data from student_details
return $query->result_array();//used to return the result
   
}
}
?>