Question

I’m having difficulty to figure out NH exception:

Batch update returned unexpected row count from update; actual row
count: 0; expected: 1

My Dal code:

 public T Save(T item)
        {
            using (ISession session = NHibernateHelper.GetSession())
            {
                using (var transaction = session.BeginTransaction())
                {
                    session.SaveOrUpdate(item);

                    transaction.Commit();

                    return item;
                }
            }
        }

My log4net file:

command 0:UPDATE Metadata_FriendDetails SET UserId = @p0, Email = @p1,
Name = @p2 WHERE FriendId = @p3;@p0 =
a358ab9d-d481-4bdd-8cb2-18ddc8898c70 [Type: Guid (0)], @p1 =
‘[e-mail]’ [Type: String (4000)], @p2 = ‘myFriend’ [Type: String
(4000)], @p3 = 2ea35658-edb1-43e3-b848-e1915d1042df [Type: Guid (0)]

2011-12-02 13:06:49,750 [Agent: adapter run thread for test
‘SaveFriendDetails_Test’ with id
‘17016e48-1ff4-4dea-8536-6aa3b24e5fb7’] DEBUG
NHibernate.AdoNet.AbstractBatcher – Closed IDbCommand, open
IDbCommands: 0 2011-12-02 13:06:49,751 [Agent: adapter run thread for
test ‘SaveFriendDetails_Test’ with id
‘17016e48-1ff4-4dea-8536-6aa3b24e5fb7’] ERROR
NHibernate.Event.Default.AbstractFlushingEventListener – Could not
synchronize database state with session
NHibernate.StaleStateException: Batch update returned unexpected row
count from update; actual row count: 0; expected: 1

Does anyone see the problem?

TIA

Answer 1

the problem was that on Save I shouldn’t supply the id value and on update I must supply it.