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我无法在 nhibernate 的上下文中执行以下更新。

using(ITransaction transaction = session.BeginTransaction())
{
    // FIRST I'm GETTING A LIST OF ITEMS IN A MANNER LIKE THIS
    var itemsToDelete = session.QueryOver<Item>()
                                   .Where(i => i.ReferenceObject.Id == otherIdValue)
                                   .List<Item>();

    // THEN I"M LOOPING THROUGH THEM
    for(itemToDelete in itemsToDelete)
    {

        session.Delete(itemToDelete);

        using (iDB2Command command = (iDB2Command)_session.Connection.CreateCommand())
        {
            command.CommandText = "update TABLE_NAME set sequence = (sequence - 1) where id = @someId and sequence > @sequenceNumberDeleted";
            command.DeriveParameters();
            command.Parameters["@someId"].Value = idValue;
            command.Parameters["@sequenceNumberDeleted"].Value = itemToDelete.Sequence;
        }
    }

    transaction.commit()
}

问题似乎出在序列 = (sequence - 1) 上。每次调用例程时，NHibernate 都会抛出“意外的行数”异常。在研究我发现与此异常相关的大多数文章时，是由更新其他行的表上的触发器引起的。在这种情况下，表上没有任何触发器。此外，如果我替换 sequence = 5 或其他一些常量，更新语句将毫无问题地执行。

DATE TIME [10] ERROR App.Controllers.AController - Unexpected row count: 2; expected: 1
DATE TIME [10] ERROR App.Controllers.AController -    at NHibernate.AdoNet.Expectations.BasicExpectation.VerifyOutcomeNonBatched(Int32 rowCount, IDbCommand statement)
   at NHibernate.AdoNet.NonBatchingBatcher.AddToBatch(IExpectation expectation)
   at NHibernate.Persister.Entity.AbstractEntityPersister.Delete(Object id, Object version, Int32 j, Object obj, SqlCommandInfo sql, ISessionImplementor session, Object[] loadedState)
   at NHibernate.Persister.Entity.AbstractEntityPersister.Delete(Object id, Object version, Object obj, ISessionImplementor session)
   at NHibernate.Action.EntityDeleteAction.Execute()
   at NHibernate.Engine.ActionQueue.Execute(IExecutable executable)
   at NHibernate.Engine.ActionQueue.ExecuteActions(IList list)
   at NHibernate.Engine.ActionQueue.ExecuteActions()
   at NHibernate.Event.Default.AbstractFlushingEventListener.PerformExecutions(IEventSource session)
   at NHibernate.Event.Default.DefaultFlushEventListener.OnFlush(FlushEvent event)
   at NHibernate.Impl.SessionImpl.Flush()
   at NHibernate.Transaction.AdoTransaction.Commit()
   at App.Controllers.AController.AMethod(Int32[] otherIdValues, Int32 someIdValue, String someReferenceValue) in    <path>\App\Controllers\AController.cs:line 117

有人可以帮我指出正确的方向吗？

编辑：迭戈是完全正确的。这就是我急于求成的结果。对该代码的实际调用是在事务内部，然后我在事务上调用提交。

4

1 回答 1

0

从那以后，我找到了问题的原因。实际的语句并没有像我想象的那样按顺序生成。相反，更新命令在删除命令之前执行，因此删除命令抛出了意外的行计数异常，而不是我之前认为的更新命令。

于 2012-10-03T14:45:13.130 回答