Transactions in the Repository Pattern

Question

How do I encapsulate the saving of more than one entity in a transactional manner using the repository pattern? For example, what if I wanted to add an order and update the

Answer 1

I would look at using some type of Transaction Scope / Context system. So you might have the following code which is roughly based on .Net & C#.

public class OrderService
{

public void CreateNewOrder(Order order, Customer customer)
{
  //Set up our transactional boundary.
  using (TransactionScope ts=new TransactionScope())
  {
    IOrderRepository orderRepos=GetOrderRespository();
    orderRepos.SaveNew(order);
    customer.Status=CustomerStatus.OrderPlaced;

    ICustomerRepository customerRepository=GetCustomerRepository();
    customerRepository.Save(customer)
    ts.Commit();   
   }
}
}

TransactionScope can nest so let's say you had an action which crossed multiple services your application would create a TransactionScope as well. Now in the current .net if you use the TransactionScope they have you risk escallating to a DTC but this will be resolved in the future.

We had created our own TransactionScope class which basically managed our DB connections and used local SQL transactions.