Simple MySqli Php Library Connnection database

database.php

<?php
	
	/**
	* 
	*/
	class database 
	{
		private $connection;
		
		public function __construct($hostname=DB_HOST, $database=DB_NAME, $username=DB_USER, $password=DB_PASS, $port = '3306') {
			$this->connection = new \mysqli($hostname, $username, $password, $database, $port);
			if ($this->connection->connect_errno) {
				throw new \Exception('Error: ' . $this->connection->connect_error . '<br />Error No: ' . $this->connection->connect_errno);
			}
			$this->connection->set_charset("utf8");
			$this->connection->query("SET SQL_MODE = ''");
		}
		public function query($sql) {
			$query = $this->connection->query($sql);
			if (!$this->connection->errno) {
				if ($query instanceof \mysqli_result) {
					$data = array();
					while ($row = $query->fetch_assoc()) {
						$data[] = $row;
					}
					$result = new \stdClass();
					$result->num_rows = $query->num_rows;
					$result->row = isset($data[0]) ? $data[0] : array();
					$result->rows = $data;
					$query->close();
					return $result;
				} else {
					return true;
				}
			} else {
				throw new \Exception('Error: ' . $this->connection->error  . '<br />Error No: ' . $this->connection->errno . '<br />' . $sql);
			}
		}
		public function escape($value) {
			return $this->connection->real_escape_string($value);
		}
		
		public function countAffected() {
			return $this->connection->affected_rows;
		}
		public function getLastId() {
			return $this->connection->insert_id;
		}
		
		public function connected() {
			return $this->connection->ping();
		}
		
		public function __destruct() {
			$this->connection->close();
		}
		
	}	

?>