데이터베이스 트랜잭션 - Laravel

// Create Account
$newAcct = Account::create([
    'accountname' => Input::get('accountname'),
]);

// Create User
$newUser = User::create([
    'username' => Input::get('username'),
    'account_id' => $newAcct->id,
]);

// Start transaction
beginTransaction();

// Run Queries
$acct = createAccount();
$user = createUser();

// If there's an error
//    or queries don't do their job,
//    rollback!
if( !$acct || !$user )
{
    rollbackTransaction();
} else {
    // Else commit the queries
    commitTransaction();
}

DB::transaction(function()
{
    $newAcct = Account::create([
        'accountname' => Input::get('accountname')
    ]);

    $newUser = User::create([
        'username' => Input::get('username'),
        'account_id' => $newAcct->id,
    ]);

    if( !$newUser )
    {
        throw new \Exception('User not created for account');
    }
});

// Start transaction!
DB::beginTransaction();

try {
    // Validate, then create if valid
    $newAcct = Account::create( ['accountname' => Input::get('accountname')] );
} catch(ValidationException $e)
{
    // Rollback and then redirect
    // back to form with errors
    DB::rollback();
    return Redirect::to('/form')
        ->withErrors( $e->getErrors() )
        ->withInput();
} catch(\Exception $e)
{
    DB::rollback();
    throw $e;
}

try {
    // Validate, then create if valid
    $newUser = User::create([
        'username' => Input::get('username'),
        'account_id' => $newAcct->id
    ]);
} catch(ValidationException $e)
{
    // Rollback and then redirect
    // back to form with errors
    DB::rollback();
    return Redirect::to('/form')
        ->withErrors( $e->getErrors() )
        ->withInput();
} catch(\Exception $e)
{
    DB::rollback();
    throw $e;
}

// If we reach here, then
// data is valid and working.
// Commit the queries!
DB::commit();