i want my password to be md5 using the codes posted, after execution i checked db content and its not in md5 format

[eluser]Alpha[/eluser]
i want my password to be md5 using the codes posted below, after execution i checked db content and its not in md5 format, is there something i missed? tnx

$this->form_validation->set_rules('password', 'Password', 'trim|required|matches[passconf]|md5');
$this->form_validation->set_rules('email', 'Email', 'trim|required|valid_email');

$this->db->query("INSERT INTO users (email, password) VALUES ('".$this->input->post('email')."', '".$this->input->post('password')."')");