使用嵌套事务范围更新数据库

时间:2016-07-01 09:52:53

标签: c# database transactionscope

在我的应用程序中,我有两种方法:GetPaymentToDateRemovePayment

public Payment RemovePayment(int paymentId)
{
    Payment payment;
    using (var transaction = new TransactionScope(TransactionScopeOption.RequiresNew,
        new TransactionOptions { IsolationLevel = IsolationLevel.Serializable }))
    {
        //some staff
        m_staffContext.SaveChanges();
        transaction.Complete();
    }
    return payment;
}

public Payment GetPaymentToDate(DateTime paymentDate)
{
    var payment = new Payment
    {
        //initialize properties
    };
    using (var transaction = new TransactionScope(TransactionScopeOption.RequiresNew,
        new TransactionOptions { IsolationLevel = IsolationLevel.Serializable }))
    {
        m_staffContext.Payments.Add(payment);
        m_staffContext.SaveChanges();
        transaction.Complete();
    }
    return payment;
}

不,我需要实现 Update 方法。此方法的逻辑是删除旧方法,然后创建新的付款。所以我想在一个父事务范围和角色返回嵌套事务中执行它,如果另一个失败。我将从现有方法中删除TransactionScopeOption.RequiresNew选项,并在update方法中编写如下内容:

public Payment UpdatePayment(int paymentId)
{
    Payment newPayment;
    using (var transaction = new TransactionScope(TransactionScopeOption.RequiresNew,
        new TransactionOptions { IsolationLevel = IsolationLevel.Serializable }))
    {
        var removedPayment = RemovePayment(paymentId);
        var newPayment = GetPaymentToDate(removedPayment.Date);
        m_staffContext.SaveChanges();
        transaction.Complete();
    }
    return newPayment;        
}

我的代码是否正确?

1 个答案:

答案 0 :(得分:1)

你不应该调用这些方法,而是使用块来实现更新付款中的实际逻辑:

using( var transaction = .....)
{
   var payment = m_staffContext.Payments.Get(paymentId);
   m_staffContext.Payments.Remove(payment);
   m_staffContext.Payments.Add(payment);
   m_staffContext.SaveChanges();
}

但为什么不更新现有付款。 在AddNewPayment方法中,Payment对象的初始化可以在单独的方法中完成,以便重用。

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