<?php

class DBConnection
{
    const DEFAULT_SQL_DB_NAME = 'blog';
    const DEFAULT_SQL_HOST = 'localhost';
    const DEFAULT_SQL_USER = 'root';
    const DEFAULT_SQL_PASS = '';

    private static $instance = null;
    private $PDOInstance = null;

    private function __construct()
    {
        $this->PDOInstance = new PDO('mysql:dbname=' . self::DEFAULT_SQL_DB_NAME . ';host=' . self::DEFAULT_SQL_HOST . ';charset=UTF8', self::DEFAULT_SQL_USER, self::DEFAULT_SQL_PASS);
    }

    public static function getInstance()
    {
        if (is_null(self::$instance)) {
            self::$instance = new DBConnection();
        }
        return self::$instance;
    }

    public function getPdo() {
        return $this->PDOInstance;
    }

    public function Prepare($sql){
        return $this->PDOInstance->prepare($sql);
    }

}