```php
<?php

require('vendor/autoload.php');

use DDLWrapper\Wrapper as Wrapper;

$pdo = new \PDO('sqlite:database.sqlite3');
$pdo->driver = 'sqlite';

$pdo->exec('CREATE TABLE coisa (id integer)');

Wrapper::set_driver($pdo);
Wrapper::begin();

$table = Wrapper::get_table('Coisa');

$table->addColumn('ida','integer');
$table->addColumn('idb','integer');

$table->removeColumn('idb');

$table->save();
Wrapper::commit();
```