<?php

class Database extends SQLite3 {
    function __construct() {
        $this->open('database.db');
    }
}

$db = new Database();
$db->exec('create table dolgok (valami string);
$db->exec("insert into dolgok (valami) values ('Teszt dolog')");

$result = $db->query('select valami from dolgok');
var_dump($result->fetchArray());
$db->close();