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

You have an error in the mysql query:-

SELECT * WHERE ` = 'muraddnw@gmail.com' LIMIT 1

Your code has not specified which table to query from. So use following:-

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

Hope this helps.

Answer 2

$this->form_validation->set_rules('username', 'userName', 'required|callback_exists_username');


#uniqueness of username
    function exists_username($str)
    {
        $record_id = $this->input->post('record_id');
        $condition = array('user_id !='=>$record_id,'username'=>$str);
        $value =GetAllRecord('user_master',$condition,$is_single=true);
        if (count($value) == 0)
        {
            return TRUE;
        }
        else
        {
            $this->form_validation->set_message('exists_username', 'username already exists!');
            return FALSE;
        }
    }

Answer 3

Use is_unique[table.field] add table name and field.

$this->form_validation->set_rules(
    'email', 'Email', 'trim|required|valid_email|is_unique[table.field]|callback_isEmailExist'
);

Answer 4

you can check if a field is unique or not by using form_validator function is_unique[table_name.field_name]

Answer 5

no need to a make a special function, this is enough

$this->form_validation->set_rules(
    'email', 'Email', 'trim|required|valid_email|is_unique'
);

Answer 6

Your problem is in the set_rules line. Here you use both is_unique and a callback function. You have to use anyone of that. If you use a call_back function to check duplicate data; doesn't need to use is_unique. For this wrong you get that error Just remove the is_unique from there.

$this->form_validation->set_rules('email','Email','trim|required|valid_email|callback_isEmailExist'); // removed is_unique

Try this out and let me know.