PHP Code not selecting from database - php

Question

UPDATE: There was no issue with the code used in counting. There was just a typo error in connecting to database
$this->conn = new PDO("mysql:host=". $this->host . ";db_name=" . $this->db_name, $this->username, $this->password);
the db_name should be dbname. So its something like
$this->conn = new PDO("mysql:host=". $this->host . ";dbname=" . $this->db_name, $this->username, $this->password);
I am try a PHP REST api with mysql database but this doesn't seem to be working as i have tried to select from my database as the first step but this returns no result despite there being a record in the database
Below are my codes
database.php
<?php
class Database
{
//Database Credentials
private $host = "localhost";
private $username = "root";
private $password = "password";
private $db_name = "rtmdb";
public $conn;
//Get Database Connection
public function getConnection()
{
$this->conn = null;
//Try connection
try
{
$this->conn = new PDO("mysql:host=". $this->host . ";db_name=" . $this->db_name, $this->username, $this->password);
$this->conn->exec("set names utf8");
}
catch(PDOException $exception)
{
echo "Connection error:" . $exception->getMessage();
}
return $this->conn;
}
}
admin.php to select from database
<?php
class Admin
{
//Database Connection and Table name
private $conn;
private $table_name = "admin";
//object properties
public $id;
public $fname;
public $lname;
public $oname;
public $uname;
public $email;
public $idnumber;
public $password;
public $profimage;
public $datecreated;
public $modifiedby;
public $datemodified;
public $status;
//Construct $db as database connection
public function __construct($db)
{
$this->conn = $db;
}
public function crawl()
{
$query = "SELECT * FROM " . $this->table_name;
$stmt = $this->conn->prepare($query);
$stmt->execute();
return $stmt;
}
}
crawl.php file to get data and json_encode results
//Include database and object files
include_once "../config/database.php";
include_once "../objects/admin.php";
$database = new Database();
$db = $database->getConnection();
$admin = new Admin($db);
//Query Admin
$stmt = $admin->crawl();
$num = $stmt->rowCount();
echo json_encode($num);
if($num > 0)
{
while ($row = $stmt->fetch(PDO::FETCH_ASSOC))
{
extract($row);
$admin_list = array(
"id" => $id,
"uname" => $uname
);
array_push($admin_arr['records'], $admin_list);
}
echo json_encode($admin_arr);
}
else
{
echo json_encode(
array("message" => "No registered admin found.")
);
}
But i get rowCount() as 0 and "no registered admin" despite having records
Below are screenshots of my table structures
the database structure
I also have only one data in the database
But these seem to give me no result. Please what the issue and how do i fix?