transactions

问题 I have a requirement to do a task after execution of a function. I have used Aspect for this. but I have some confusion. I have a function A() in a spring service. @Transactional(readOnly = false, isolation = Isolation.DEFAULT, propagation = Propagation.REQUIRED, rollbackFor = {Exception.class}) void A() { //Do Something } I have an @Afterreturning aspect on this function. @AfterReturning(pointcut = "execution(Sevice.saverecord(..)) ") public void processNotifications(JoinPoint jp) {} I want

问题 I have a requirement to do a task after execution of a function. I have used Aspect for this. but I have some confusion. I have a function A() in a spring service. @Transactional(readOnly = false, isolation = Isolation.DEFAULT, propagation = Propagation.REQUIRED, rollbackFor = {Exception.class}) void A() { //Do Something } I have an @Afterreturning aspect on this function. @AfterReturning(pointcut = "execution(Sevice.saverecord(..)) ") public void processNotifications(JoinPoint jp) {} I want

问题 Can I apply the @Transactional tag to an aspect advice? I'm trying to wrap all calls to the service layer (com.mycompany.app.myapp.service.*) in a transaction using aspects. My aspect is properly intercepting the calls to the service layer, but I can't figure out how to start a transaction. I thought I could apply the @Transactional tag and because I've got the tag, it'd pick it up and begin the transaction. What am I missing? XML configuration: <bean id="systemArchitectureAspect" class="com

问题 I need an example to implement transactions in MongoDB with GoLang. I'm using this golang driver for mongodb https://github.com/mongodb/mongo-go-driver There is no clear documentation for how to implement transactions. Can anyone help me? 回答1: It can be confusing. Below is a simple example. if session, err = client.StartSession(); err != nil { t.Fatal(err) } if err = session.StartTransaction(); err != nil { t.Fatal(err) } if err = mongo.WithSession(ctx, session, func(sc mongo.SessionContext)

问题 I am trying to understand how to safely increment a counter column, that may be incremented simultaneously by many users (It's a Web API for a mobile app). I've read the popular questions in SO for strategies dealing with the issue but I can't seem to figure what's wrong with using a simple: UPDATE Table SET Counter = Counter + 1 I've built the following code sample to try and get inconsistent values and prove myself that using only this simple update statement is not good practice: class

问题 I have a web application that is using the absolute latest version (3.3) and is using session-by-request session management within a HttpModule, so there are no problems with multiple session conflicts. Unfortunately, I am finding that the session is getting automatically closed immediately after I perform a Transaction.Commit which I only do when I am actually performing a Create, Update or Delete. I am finding this within my NHibernate log. I know for a fact that I am not doing it, because

问题 The rollback of my transaction doesn't work. How do I set autocommit to false (or 0) in the php script using PDO (I have InnoDB 5.7.18) ? Here is my code: global $bdd; //defined with PDO try { $bdd->beginTransaction(); /* my requests */ $bdd->commit(); } catch (Exception $e) { $bdd->rollBack(); return $e->getMessage(); } return true; } 回答1: $db = new PDO('mysql:dbname=employee'); $db->setAttribute(PDO::ATTR_AUTOCOMMIT,0); var_dump($db->query('SELECT @@autocommit')->fetchAll()); 回答2: I solved

问题 The rollback of my transaction doesn't work. How do I set autocommit to false (or 0) in the php script using PDO (I have InnoDB 5.7.18) ? Here is my code: global $bdd; //defined with PDO try { $bdd->beginTransaction(); /* my requests */ $bdd->commit(); } catch (Exception $e) { $bdd->rollBack(); return $e->getMessage(); } return true; } 回答1: $db = new PDO('mysql:dbname=employee'); $db->setAttribute(PDO::ATTR_AUTOCOMMIT,0); var_dump($db->query('SELECT @@autocommit')->fetchAll()); 回答2: I solved

问题 From another question, clearly the Intel TSX read/write set is hidden. And this is understandable, especially since it allows them to screw with design and implementation and possibly try things like bloom filters or whatever. But when a transaction aborts, it would be good to see what address - or cache line - caused it (when such a thing was the reason for the abort). Is the address exposed anywhere? 回答1: After talking to folks at Intel, there is no way to do this [citation]. The address is

问题 From another question, clearly the Intel TSX read/write set is hidden. And this is understandable, especially since it allows them to screw with design and implementation and possibly try things like bloom filters or whatever. But when a transaction aborts, it would be good to see what address - or cache line - caused it (when such a thing was the reason for the abort). Is the address exposed anywhere? 回答1: After talking to folks at Intel, there is no way to do this [citation]. The address is