如何在Entity框架中维护并发？

问题描述

在我的在线考试项目中， WCF 有4种方法：



1）GetSections ------ --------------仅选择部分

2）GetExamDetails --------------- - 从数据库中选择考试详情

3）GetQuestionsAndInsert ----------选择问题并在考试表中插入

4）UpdateAttempt ------------------更新db中的尝试



这些方法在用户点击考试链接时执行。当2个或更多用户点击该链接时，检查页面会成功加载，但如果 2个用户同时点击同一个链接，那么任何一个方法中的任何一个或两个都会从上面获得错误。交易失败等错误，在其他交易正在运行时无法读取数据等。



我在项目中使用了实体框架。我知道它是并发问题但我无法解决它。请告诉我如何解决这个问题。



请尽快回复。



谢谢。

In my online exam project there are 4 methods in WCF:

1)GetSections--------------------Select only sections
2)GetExamDetails-----------------Select exam details from db
3)GetQuestionsAndInsert----------Select questions and insert in Exam table
4)UpdateAttempt------------------Update attempts in db

These methods are executed when user click on exam link. When 2 or more users click on that link exam page get load successfully but if 2 users click on same link at same time then any one of then or both get error from above any 1 method. Errors like transaction failed,can not 'read' data while other transaction is running etc.

I used Entity Framework in my project. I know it is concurrency issue but I am not able to resolve it. Please tell me how to manage this problem.

Please reply ASAP.

Thank you.

推荐答案

My problem resolved. I have declared entity object globally so that I got this error. Now I declare separate object in each method and my problem is solved.
 
Explanation : As entity object is globally declared all methods run on same object. They are not able to do operations on database by same object and transaction get failed.

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