Nhibernate why use transaction

NHibernate assumes that all access to the database is done under a transaction, and strongly discourages any use of the session without a transaction. Essentially TransactionScope doesn't track your Adapter's, what it does is it tracks database connections. When you open a DB connection the connections will looks if there is an ambient transaction Transaction Scope and if so enlist with it.

Caution if there are more the one connection to the same SQL server this will escalate to a Distribtued Transaction. What happens since you're using a using block you are ensuring dispose will be called even if an exception occurs. So if dispose is called before txScope. Short-circuiting can improve performance by not evaluating an expression that cannot alter the result of the logical operation.

However, if that expression performs additional actions, short-circuiting skips those actions. For example, if the expression includes a call to a Function procedure, that procedure is not called if the expression is short-circuited, and any additional code contained in the Function does not run. If your program logic depends on any of that additional code, you should probably avoid short-circuiting operators.

Basically nothing in threading should be done blindly. Think about where it actually makes sense to parallelize. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

This site uses Akismet to reduce spam. Learn how your comment data is processed. Real world advice from someone who appreciates the common stumbling points in learning this challenging sport. This operation cascades to associated instances. If there is no persistent instance currently associated with. Return the persistent instance.

If the. The given instance does not become associated with the session. This operation cascades to associated. This method is, however, useful in certain special circumstances. ITransaction BeginTransaction ;. It does nothing if it is already. ICriteria CreateCriteria System. Type persistentClass ;.

Type persistentClass , string alias ;. ICriteria CreateCriteria string entityName ;. ICriteria CreateCriteria string entityName , string alias ;. IQuery CreateQuery string queryString ;. IQuery CreateFilter object collection , string queryString ;. Evict all loaded instances and cancel all pending.

Do not close open enumerables or instances of. Type clazz , object id ;. Obtain the specified lock mode if the instance. Type clazz , object id , LockMode lockMode ;. The difficulty relates to how to reliable automatically flush changes at the end of TransactionScope , and without getting stuck in deadlock. In our project we need to have transaction on file operations. They use TransactionScope. When we want to use "best practice" the code would look like this:.

Problem with this code is that when the exception will be thrown in tx. Complete then NH transaction already commited all DB changes and of course the transaction is broken files operations will be rollbacked. From my point of view we cannot have two Commits in the code, so basically only TransactionScope.

Complete should be invoked and this operation should commit all DB and file operations. I wonder if there is some issue with using the correction transaction factory etc. With the default transaction factory in e.

Committing the NH transaction should result in NH flushing changes, but the DB transaction should still be alive and not actually committed until the transaction scope is completed. Assert at the end of this test fails because workerCount is 1 and should be 0 because we dispose TransactionScope. Maximilian Haru Raditya added a comment — 15th November ,