事务中的rollback方法可以省略吗 [ 2.0 版本 ]

$transaction = Customer::getDb()->beginTransaction();
try {
    $customer = new Customer();
    $customer->id = 1;
    $customer->save();
    
    $customer = new Customer();
    $customer->id = 2;
    $customer->save();
    
    $customer = new Customer();
    $customer->id = 3;
    $customer->save();
    
    $transaction->commit();
} catch(\Exception $e) {
    $transaction->rollBack();
    throw $e;
}

如上代码，$transaction->rollBack(); 这行代码感觉可有可无，去掉之后，如果数据库执行异常了，所有try里面的数据库操作都不会被执行