Fatal error: Uncaught Error ( php mysql ) - php

Question

I am learning php oop with mysql and I am having trouble fixing this code.
I have checked it twice and also checked this platform to confirm.
<?php
require 'databasesclass.php';
$database = new Database();
$database->query('SELECT * FROM users');
$rows = $database->resultset();
print_r($rows);
and my data base class are
<?php
class Database{
private $host = 'localhost:8889';
private $user = 'root';
private $pass = 'root';
private $dbname = 'register';
private $dbh;
private $error;
private $stmt;
public function __construct(){
// Set the DSN
$dsn = 'mysql:host='. $this->host . ';dbname=' . $this->dbname . $this->user . $this->pass;
// set options
$options = array(
PDO::ATTR_PERSISTENT => true,
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION );
try {
$this->dbh = new PDO($dsn, $this->user, $this->pass, $options);
} catch (PDOException $e) {
$this->error = $e->getMessage();
}
}
public function query($query){
$this->stmt = $this->dbh->prepare($query);
}
public function bind($pram, $value, $type = null){
if (is_null($type)){
switch(true) {
case is_int($value):
$type = PDO::PRAM_INT;
break;
case is_bool($value):
$type = PDO::PRAM_BOOL;
break;
case is_null($value):
$type = PDO::PRAM_NULL;
break;
default:
$type = PDO::PRAM_STR;
}
}
$this->stmt->bindValue($parm, $value, $type);
}
public function execute(){
return $this->stmt->execute();
}
public function resultset(){
$this->execute();
return $this->stmt->fetchALL(PDO::FETCH_ASSOC);
}
}
Fatal error: Uncaught Error: Call to a member function prepare() on
null in C:\MAMP\htdocs\Practice\databasesclass.php:31 Stack trace: #0
C:\MAMP\htdocs\Practice\index.php(7): Database->query('SELECT * FROM
u...') #1 {main} thrown in C:\MAMP\htdocs\Practice\databasesclass.php
on line 31
And the Line 31 is:
$this->stmt = $this->dbh->prepare($query);

Answer 1

No need to pass $this->user and $this->pass into your $dns variable. Remove them from there.
So $dns variable will be
from
$dsn = 'mysql:host=' . $this->host . ';dbname=' . $this->dbname . $this->user . $this->pass;
to
$dsn = 'mysql:host=' . $this->host . ';dbname=' . $this->dbname;
Please check and let me if you see any error there.

Answer 2

In the moment that you are executing the $database->query('SELECT * FROM users') the $this->dbh is null. You could check if it is an instance of PDO before do the prepare.