Codeigniter:Update Image and Display

Question

I\'m stuck on a problem with updating image. I\'ve created image upload which works fine but I also want it to be updated. When I add a need image it updates correctly but I

Answer 1

    public function update()
    {
        $id=$this->input->post("id");

        $s_em=$this->input->post("s_em");
        $s_na=$this->input->post("s_na");


 if($_FILES[file]['name']!="")
            {
    $config['upload_path'] = './uploads/';
        $config['allowed_types'] =     'gif|jpg|png|jpeg|jpe|pdf|doc|docx|rtf|text|txt';
        $this->load->library('upload', $config);
        if ( ! $this->upload->do_upload('file'))
        {
            $error = array('error' => $this->upload-   >display_errors());
        }
        else
        {
            $upload_data=$this->upload->data();
            $image_name=$upload_data['file_name'];
        }
    }
    else{
                $image_name=$this->input->post('old');
            }
$data=array('s_em'=>$s_em,'s_na'=>$s_na,'file'=>$image_name);
$this->Students_m->db_update($data,$id);
}

in the view file add the following

try this..let me know this works or not.