how to check if username already exists in codeigniter

Question

I am working on a site in codeigniter.I am not so expert using framework.Here I have to check if email already exists in database.I have coded the required functionality but

Answer 1

Just add is_unique[tablename.fieldname] rules to the form validation. for Example:

 array('field' => 'email', 'label' => 'Email', 'rules' => 'trim|required|valid_email|is_unique[users.email]'));

Answer 2

Your Model is like

$this->db->select('id');
$this->db->where('email', $email);

please tell the mysql from which table you want to get the record.

$this->db->from('tablename');

it would be like

$this->db->select('id');
$this->db->from('tablename');
$this->db->where('email', $email);