Hello, so I am working on an MVC application. The problem that I’m having is with the database and connecting to it. So when I extends my controller, this is what it keeps saying.
Fatal error: Call to a member function grab_records() on a non-object in F:\htdocs\model\records.php on line 43
Then if I change it from Controller to Model, this is what it says.
Notice: Undefined property: Default_Records::$db in F:\htdocs\model\model.php on line 81
Fatal error: Call to a member function prepare() on a non-object in F:\htdocs\model\model.php on line 81
For the first part, I believe it’s doing that because the model is where the $this->db is located, but then it should already be included in the controller because in the controller I have.
<?php
class Controller {
public $db = null;
public $model = null;
function __construct() {
$this->database();
$this->model();
}
private function database() {
$this->db = new mysqli('localhost', 'root', 'root', 'sample_database');
}
public function model() {
require_once('model/model.php');
$this->model = new Model($this->db);
}
}
Here is my model.php file
<?php
class Model {
public $model = null;
function __construct($db) {
try {
$this->db = $db;
} catch (mysqli_sql_exception $e) {
exit('Database connection could not be established.');
}
}
// $grab_title and $grab_artist are user inputs. Basically searching the database with the title and artist the user typed in.
public function grab_records($grab_title, $grab_artist) {
$stmt = $this->db->prepare("SELECT id, title, artist FROM records WHERE title = ? AND artist = ? LIMIT 1");
$stmt->bind_param("ss", $grab_title, $grab_artist);
$stmt->execute();
$stmt->store_result();
if($stmt->num_rows) {
$stmt->bind_result($record_id, $record_title, $record_artist, $record_date, $record_sold);
while($stmt->fetch()) {
return $record_id;
return $record_title;
return $record_artist;
return $record_date;
return $record_sold;
}
} else {
$no_records = "Sorry, but there seems to be no records with that title and artist.";
return $no_records;
}
}
}
So I don’t know why using
class Default_Records extends Controller {
should be any problem. So I decided to extends the Model instead because I was thinking that maybe it’s because the controller requiring the Model class once. This time for the second part, I found out that it’s because anything that isn’t within the function __construct(), it won’t load up. I’ve tried actually include call my function via the construct operator and it works fine because the database is processing the query. However if I don’t use the construct to call for the function then I get either one of those errors.
Thank you so much. With your help, I got it to work. I had to call the parent constructor from the Controller.
Very nice. Thanks a lot.