问题描述
我必须开发一个银行系统，允许用户存入或取出账户。
我已经实现了整个逻辑，现在的要求是账户不能有负余额，我卡住了这里。
多个用户可以从一个帐户中抽奖。如何在多个并发用户（或请求）的情况下实现负余额？
例如用户A和B同时抽签，用户A的请求先完成，账户得到负余额那么我该如何向用户B提出错误？
我尝试过：
我用两种存款和取款方法创建了WCF Restful服务。我正在使用绘图时检查帐户余额。
I have to develop a banking system which allows users to deposit or withdraw in accounts.
I have implemented the whole logic,now the requirement is that an account cannot have negative balance,I am stuck here.
Multiple users can with-draw from a single account. How can I implement the negative balance in-case of multiple concurrent users(or requests)?
eg User A and B with-draws at same time, User A's request finish first and the account got negative balance,then how can I give error to user B?
What I have tried:
I have created WCF Restful service with two methods for deposit and withdrawal. I am checking account balance while with-drawing.
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