transactions

问题 My question is related to use of nhibernate transactions Is the transaction.Begin() below a problem? or just redundant? using (var transaction = session.BeginTransaction()) { transaction.Begin(); action(); transaction.Commit(); } 回答1: After checking the source, transaction.Begin() is in fact redundant - a harmless no-op. link to source 回答2: beginTransaction as it states begins a transaction, on the other hand session.Transaction will return the current active transaction if null will create

问题 My question is related to use of nhibernate transactions Is the transaction.Begin() below a problem? or just redundant? using (var transaction = session.BeginTransaction()) { transaction.Begin(); action(); transaction.Commit(); } 回答1: After checking the source, transaction.Begin() is in fact redundant - a harmless no-op. link to source 回答2: beginTransaction as it states begins a transaction, on the other hand session.Transaction will return the current active transaction if null will create

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . Does someone knows a good book where transaction isolation levels are explained with a lot of examples and advices in what case what

问题 I'm using Wildfly 8.2 and fire a series of DB requests when a certain web page is opened. All queries are invoked thru JPA Criteria API, return results as expected - and - none of them delivers a warning, error or exception. It all runs in Parallel Plesk. Now, I noticed that within 2 to 3 days the following error appears and the site becomes unresponsive. I restart and I wait approx another 3 days till it happens again (depending on the number of requests I have). I checked the tcpsndbuf on

问题 I have a model file that uses a post_save signal to create a linked row in another table. In typical fashion, I can create a page from one of my views which is decorated with @transaction.atomic. I would like to know if this decorator will put the creation of the Page object and the SharedPage object in the same transaction. It is not clear from the django docs that signals are a part of this atomic transaction. models.py class Page(models.Model): name = models.CharField(default='My default

问题 I have a web application that uses the Entity Framework - we make use of the TransactionScope class to provide ambient transactions. Is there any way to tell EF to use a standard T-SQL transaction in preference to DTC transaction? Quite often we make a number of queries to different tables inside one EntityContext and one TransactionScope instance, however this seems to always promote the transaction to DTC I have put a short example together, see below. The query to the individual table

问题 Recently, I've been checking out RabbitMQ over C# as a way to implement pub/sub. I'm more used to working with NServiceBus. NServiceBus handles transactions by enlisting MSMQ in a TransactionScope . Other transaction aware operations can also enlist in the same TransactionScope (like MSSQL) so everything is truly atomic. Underneath, NSB brings in MSDTC to coordinate. I see that in the C# client API for RabbitMQ there is a IModel.TxSelect() and IModel.TxCommit() . This works well to not send

问题 I am trying Spring 3(.0.2.RELEASE) and JPA2 and Hibernate 3.5.1-Final... One thing upsets me is that spring seems only accept a transaction Manager named "transactionManager" If I don't name it "transactionManager" , Spring will throws NoSuchBeanDefinitionException: No bean named 'transactionManager' is defined. Here is my config : <context:component-scan base-package="destiny.data.mining"/> <context:annotation-config/> <bean id="miningEntityManagerFactory" class="org.springframework.orm.jpa

问题 Have a typed dataset with several related tables, and relations defined between those tables. As I process a datafeed, I'm adding, modifying, and removing records, then calling update on each table. Requests Reapprovals UserRole RequestId ----- RequestId ----- RoleId Reason RoleId ----/ UserId The reason for using a typed dataset is that I have to check existing data to determine whether I'm adding, modifying, or removing records... so I need the full dump of everything I'm working with (the

问题 In the Spring Framework manual they state that for a PROPAGATION_REQUIRES_NEW the current transaction will be suspended. What does that "suspended transaction"? The timer for the timeout stops counting on the current transaction? What are the actual implication of such suspension? Thank you, Asaf 回答1: It doesn't mean anything special, a suspended transaction is just a transaction that is temporarily not used for inserts, updates, commit or rollback, because a new transaction should be created