Question

I would like to know how to deal with nested transactions e.g. Between
one begin and commit, I have another begin and commit. The reason I am
asking you is because in my ApplicationServices project I have
services that depends on other services. And a method of a parent
service begins a transaction and depending upon some logic, it might
have to call one of the methods of the dependent child services, that
also in turn perform begin and commit. The Child services method are
also being used independently as well directly from the controllers,
therefore I have to use begin and commit in the child services.

So in short, basically I will end up having something like this

   using( Repository1.DbContext.BeginTransaction() )
   {
      try
      {
         .....
         .....
         using( Repository2.DbContext.BeginTransaction() )
         {
            try
            {
               .....
               .....
               Repository2.DbContext.CommitTransaction()
            }
            catch
            {
               Repository2.DbContext.RollBack();
               throw;
            }
        }
        Repository1.DbContext.CommitTransaction()
      }
      catch
      {
         Repository1.DbContext.RollBack();
         throw;
      }
   }

So there are nested begins and commits. I would like to know

-what would be the behavior, when the nested Repository2 gets
committed successfully but the parent Repository1 is rollbacked ?

How can I control this behavior in code e.g.

-if I don’t want to make child transaction part of the parent
transaction.
-how to figure out wether a transaction is already running before
creating a child transaction

or if there is another elegant solution to this problem?

Thanks
Nabeel

Answer 1

NHibernate does not support nested transactions. Is the DbContext is the same for both Repository1 and Repository2? If that’s the case then they can participate in the same transaction. If not, you’ll have to split the transactions into two methods or look at the System.Transactions namespace.