NMemory Transaction
Introduction
Transaction is a unit of work that is performed against a database.
- If a transaction is successful, all the data modifications made during the transaction are committed and become a permanent part of the database.
- If a transaction encounters errors and must be canceled or rolled back, then all the data modifications are erased.
Transaction Scope
Commit Data
Execute and commit data operation within a transaction scope.
MyDatabase database = new MyDatabase(); using (TransactionScope tran = new TransactionScope()) { database.Members.Insert(new Member { Id = "A" }); tran.Complete(); }
Rollback Data
Execute and rollback data operation within a transaction scope.
MyDatabase database = new MyDatabase(); // 'false' indicates that it will vote 'Rollback' FakeEnlistmentNotification enlistment = new FakeEnlistmentNotification(false); try { using (TransactionScope tran = new TransactionScope()) { Transaction.Current.EnlistVolatile(enlistment, EnlistmentOptions.EnlistDuringPrepareRequired); database.Members.Insert(new Member { Id = "A" }); tran.Complete(); } } catch { }
Fake Enlistment Notification
The transaction has to be committed, and the true value in the FakeEnlistmentNotification constructor indicates that it will vote Commit.
MyDatabase database = new MyDatabase(); // 'true' indicates that it will vote 'Commit' FakeEnlistmentNotification enlistment = new FakeEnlistmentNotification(true); try { using (TransactionScope tran = new TransactionScope()) { Transaction.Current.EnlistVolatile(enlistment, EnlistmentOptions.EnlistDuringPrepareRequired); database.Members.Insert(new Member { Id = "A" }); tran.Complete(); } } catch { }
External Transaction
Enlist the transaction to a manually created external Transaction object that propagates Commit.
MyDatabase database = new MyDatabase(); CommittableTransaction external = new CommittableTransaction(); NMemory.Transactions.Transaction transaction = NMemory.Transactions.Transaction.Create(external); database.Members.Insert(new Member { Id = "A" }, transaction); external.Commit();