嵌套交易范围.net

Question

我正在使用SQL Server 2008 R2，并尝试使用事务。

首先是有关.net和SQL Server中事务的问题。 如果我有这样的事情

try {
    var transactionOption = new TransactionOptions();
    transactionOption.IsolationLevel = IsolationLevel.ReadCommitted;
    transactionOption.Timeout = TransactionManager.MaximumTimeout;

    using (var scope = new TransactionScope(TransactionScopeOption.RequiresNew, transactionOption)) {
        //create question this creates a new question in the database
        Helpers.CreateQuestionBankItem(ref mappedOldNewQuestionItemGuid, missingQuestionBankItems);
        //question created

        //query database for the code of the newly inserted question, will the database give me the code since Complete has not been called as yet?    



        scope.Complete();
    }
}
catch (Exception ex) {
    throw;
}

//query database for the code of the newly inserted question,  will the database give me the code since Complete has been called as now?    

在这一点上，我应该致电数据库询问新插入的问题的代码。 现在是我的第二个问题，在我问这个链接之前，我已找到嵌套事务 。 根据以上链接，我仍然想问一下我是否有这样的东西

try {
    var transactionOption = new TransactionOptions();
    transactionOption.IsolationLevel = IsolationLevel.ReadCommitted;
    transactionOption.Timeout = TransactionManager.MaximumTimeout;

    using (var outerscope = new TransactionScope(TransactionScopeOption.RequiresNew, transactionOption)) {
        try {
            var transactionOption = new TransactionOptions();
            transactionOption.IsolationLevel = IsolationLevel.ReadCommitted;
            transactionOption.Timeout = TransactionManager.MaximumTimeout;

            using (var innerscope = new TransactionScope(TransactionScopeOption.RequiresNew, transactionOption)) {
                //create question this creates a new question in the database
                Helpers.CreateQuestionBankItem(ref mappedOldNewQuestionItemGuid, missingQuestionBankItems);
                //question created

                //query database for the code of the newly inserted question, will the database give me the code since Complete has not been called as yet?    

                innerscope.Complete();
            }
        }
        catch (Exception ex) {
        }

        //query database for the code of the newly inserted question,  will the database give me the code since Complete has been called as now?    

        outerscope.Complete();
    }
}
catch (Exception ex) {
    throw;
}

如果我的innerscope完成，将查询SQL Server给我新创建的问题的代码。

如果内部范围引发异常并且我吞噬了该异常，那么外部范围也会被丢弃怎么办？

调用innerscope.Complete（）是否可以完成该内部作用域？

Answer 1

如果要在事务上下文中从故障中恢复，则需要使用事务保存点 。 不幸的是，托管System.Transaction不支持保存点。 不仅如此，如果您使用事务作用域，则将无法甚至直接使用保存点，因为事务作用域将升级为分布式事务，并且保存点在分布式上下文中不起作用。

您可以使用支持Save()的保存点的特定于平台的SqlTransaction 。 有关异常处理的异常处理的示例，请参见异常处理和嵌套事务 。