How to upload image file in Database by codeigniter

CodeIgniter Image and File Upload

public function insertblog()

{

$title = $this->input->post('title');

$author = $this->input->post('author');

$date = $this->input->post('date');

$description = $this->input->post('description');

$status = $this->input->post('status');

$images_count = count($_FILES['userfile']['name']);

$_FILES['image']['name'] = $_FILES['userfile']['name'];

      $_FILES['image']['type']     = $_FILES['userfile']['type'];

        $_FILES['image']['tmp_name'] = $_FILES['userfile']['tmp_name'];

        $_FILES['image']['error']    = $_FILES['userfile']['error'];

        $_FILES['image']['size']     = $_FILES['userfile']['size'];

        $config['upload_path']   = 'uploads';

$config['allowed_types'] = 'gif|jpg|jpeg|png';

      $this->load->library('upload', $config);

      $this->upload->initialize($config);

        if($this->upload->do_upload('userfile')){

        $data = array('upload_data' => $this->upload->data());

        $img[] = $data['upload_data']['file_name'];

        }

          $product = array(

       

      'title'  => $title,

      'author'     => $author,

      'date' => $date,

      'description' => $description,

      'status' => $status,

      'image' => implode(",",$img),

      );

         

        if ($this->admin_blog_model->insertblog($product))

            {                             

                redirect('admin/all_blog');            

            }

            else

            {                

               redirect('admin/add_new_blog');

            }

            $this->admin_blog_model->insertblog($data);

            $this->load->view('admin/edit_new_blog', $data);

              redirect ('admin/add_new_blog');

}