为什么CodeIgniter以数组的形式返回SQL查询，且其中包含一个对象？

Question

I have constructed a model within codeigniter named 'Profile_model' which contains the following sql queries, and is supposed to return the user_name of the user with a given id ( 'userpdata' is the table which contains this info) :

public function get_username($id)
{
  $query = $this->db->select('user_name')
                    ->where('id', $id)
                    ->get('userpdata');
  return $query->result();
}

I have passed in the $id of the current user from the controller like so (model is referred to as 'profile' ):

$userId = strval($this->ion_auth->get_user_id());
$data = array(
    'username' => $this->profile->get_username($userId)
    );

$this->load->view('user/profile', $data);

user/profile view:

<?php 
  print_r($username);
?>

This returns the string:

Array ( [0] => stdClass Object ( [user_name] => hish ) )

Which appears to be an array containing an object. How can I retrieve just the user_name 'hish' ?

Answer 1

Change $query->result(); to $query->row(); so that you don't get an array. The result() method returns an array of rows, each of which is an object. The row() method returns the first object of the result set.

public function get_username($id)
{
  $query = $this->db->select('user_name')
                    ->where('id', $id)
                    ->get('userpdata');
  return $query->row();
}

You will end up with the object that contains the property user_name . You could either get the value of it in the controller.

$user = $this->profile->get_username($userId);
$data = array(
    'username' => $user->user_name
);

Or you could get it in the view without changing the controller and use this $username->user_name .

Codeigniter - Generating Query Results