how to check if username already exists in codeigniter my error - codeigniter

Question

My controler cod is:
function register()
{
if(isset($_POST['register'])){
$this->form_validation->set_rules('username','Username','required');
$this->form_validation->set_rules('email','Email','required');
$this->form_validation->set_rules('password','Password','required');
//
if($this->form_validation->run () == true){
echo 'Form Validate';
$data = array(
'username'=>$_POST['username'],
'email'=>$_POST['email'],
'password'=>strtoupper(hash('whirlpool',$_POST['password']))
);
$this->db->insert('accounts',$data);
$this->load->model("usuarios_model");
if($this->usuarios_model->check_user_exist($data['username'])){
echo "already user exist";
}{
$this->db->insert('accounts',$data);
redirect("painel/index");
}
}
}
$this->load->view("painel/register");
}
[![enter image description here][2]][2]
It registers an user even though the username already exists.
Where is the mistake?

Answer 1

You can use is_unique rule in your form_validation library.
$this->form_validation->set_rules('username','Username','required|is_unique[table.column]');

Answer 2

You have mistake in your model in where condition it will be small later of username but you used Username.
use this code in your model.
function check_user_exist($username){
$this->db->wehre('username',$username);
$this-db->from('accounts');
$query= $this->db->get();
if($query->num_rows() > 0){
return true;
}else{
return false;
}
}
and also controller data insert after user check:
if($this->usuarios_model->check_user_exist($data['username'])){
echo "already user exist";
}{
$this->db->insert('accounts',$data);
redirect("painel/index");
}

Answer 3

You can easily achieve this using call_back function in validation. From Codeigniter Docs
Controller
function register() {
if ($this->input->post('register')) {
$this->form_validation->set_rules('username','Username','required|callback_checkUserName');
$this->form_validation->set_rules('email','Email','required');
$this->form_validation->set_rules('password','Password','required');
//
if ($this->form_validation->run() == true) {
$data = array(
'username '=> $this->input->post('username'),
'email' => $this->input->post('email'),
'password' => strtoupper(hash('whirlpool', $this->input->post('password')))
);
$this->db->insert('accounts',$data);
echo 'success';
exit();
} else {
echo validation_errors(); die; // check errors
}
}
$this->load->view("painel/register");
}
// call back validate function
function checkUserName($userName){
if ($this->usuarios_model->checkUserexist($userName) == false) {
return true;
} else {
$this->form_validation->set_message('checkUserName', 'This userName already exist!');
return false;
}
}
MODEL
function checkUserexist($userName) {
$this->db->where('username', $userName);
$this-db->from('accounts');
$query = $this->db->get();
if ($query->num_rows() > 0) {
return true;
}
return false;
}

Answer 4

This my code which I used in one of my projects replace the words with your code:
$this->form_validation->set_rules('companyname','Company Name','trim|required|callback_companyname_exist');
Here is above callback function:
function companyname_exist($str) {
$this->db->where('company_name', $str);
$this->db->where('user_type','Shop');
$prod = $this->db->get('grs_user');
if ($prod->row()) {
$this->form_validation->set_message('companyname_exist', 'This Company name is already Available.');
return FALSE;
} else
return TRUE;
}
You can used this for already register email check also.