Select query in codeigniter not working with mysqli - codeigniter

Question

Mysql query executed in mysql but not in mysqli and mysql is deprecated so what syntax I have to use for mysqli in codeigniter:
$sql = "SELECT admin_email
FROM `tbl_admin`
WHERE `admin_email` = '" . $username . "' and `admin_password` = '" . $password . "'";
$query = $this->db->query($sql);

Answer 1

You can use Codeigniter Query Bulider
$this->db->select('admin_email');
$this->db->from('tbl_admin');
$this->db->where('admin_email', $username);
$this->db->where('admin_password', $password);
$query = $this->db->get();

Answer 2

I hope it works...
$this->db->select('*');
$this->db->from('tbl_admin');
$this->db->where('admin_email', $username);
$this->db->where('admin_password', $password);
$query = $this->db->get();
$result = $query->row();
return $result;

Answer 3

Try ...
$this->db->select('admin_email');
$this->db->where(
array(
'admin_email' => $username,
'admin_password' => $password
));
$query = $this->db->get('tbl_admin');
$result = $query->row();
Hopefully it works in your end...

Answer 4

$this->db->where('admin_email',$email);
$this->db->where('admin_password',$password);
$qry = $this->db->get('tbl_admin');
if($qry->num_rows() > 0){
return true;
}else{
return false;
}

Answer 5

It will work fine only if you set your Query in the Model then load that model in your controller. Directly setting the query from Controller seems to have this issue.
Example:
From the Model: Example 'Users.php'
class Users extends CI_Model {
public function __construct() {
parent::__construct();
}
function check_username($username) {
$query = $this->db->query("select * from `user_login` where `username`='$username'")
$query_result = $query->result_array;
if (!empty($query_result)) {
return $query_result;
}
return[];
}
}
From the Controller: Example 'Userauth.php'
class Userauth extends CI_Controller {
public function process_forgot(){
$CI =& get_instance();
$CI->load->model('Users'); //Model loaded here
$username = $this->input->post('username');
$check = $CI->Users->check_username($username);
echo '<pre>';
print_r($check);
echo '</pre>';
}
}
Try it.