1) tạo một config.php
define('DBUSER','username');
define('DBPWD','password');
define('DBHOST','localhost');
define('DBNAME','database name');
2) db.php
<?php
include('config.php');
class db extends mysqli {
// single instance of self shared among all instances
private static $instance = null;
// db connection config vars
private $user = DBUSER;
private $pass = DBPWD;
private $dbName = DBNAME;
private $dbHost = DBHOST;
//This method must be static, and must return an instance of the object if the object
//does not already exist.
public static function getInstance() {
if (!self::$instance instanceof self) {
self::$instance = new self;
}
return self::$instance;
}
// The clone and wakeup methods prevents external instantiation of copies of the Singleton class,
// thus eliminating the possibility of duplicate objects.
public function __clone() {
trigger_error('Clone is not allowed.', E_USER_ERROR);
}
public function __wakeup() {
trigger_error('Deserializing is not allowed.', E_USER_ERROR);
}
private function __construct() {
parent::__construct($this->dbHost, $this->user, $this->pass, $this->dbName);
if (mysqli_connect_error()) {
exit('Connect Error (' . mysqli_connect_errno() . ') '
. mysqli_connect_error());
}
parent::set_charset('utf-8');
}
public function dbquery($query)
{
if($this->query($query))
{
return true;
}
}
public function get_result($query)
{
$result = $this->query($query);
if ($result->num_rows > 0){
$row = $result->fetch_assoc();
return $row;
} else
return null;
}
}
?>
3) sử dụng
require 'db.php';
$query="select * from tbl_session";
$sockets = db::getInstance()->get_result($query);
hoặc bất kỳ truy vấn nào khác
$query="insert into `tbl_chats` (coloum_name) values('".$val."')";
$wisherID = db::getInstance()->dbquery($query);
