Question

我们正在尝试使用以下代码进行间接嵌套事务，.NET 3.5和＆amp; SQL Server 2005.

MSDN说，当使用TransactionScope时，只要应用程序在事务中打开第二个连接（甚至是同一个数据库），事务就会升级。

void RootMethod()
{
   using(TransactionScope scope = new TransactionScope())
   {
      /* Perform transactional work here */
      FirstMethod();
      SecondMethod();
      scope.Complete();
   }
 }

void FirstMethod()
{
    using(TransactionScope scope = new TransactionScope(TransactionScopeOption.Required))
   {
     using (SqlConnection conn1 = new SqlConnection("Data Source=(local);Initial Catalog=Northwind;Integrated Security=SSPI")) 
       {
     string insertString = @"
             insert into Categories
             (CategoryName, Description)
             values ('Laptop1', 'Model001')";
         conn1.Open();
         SqlCommand cmd = new SqlCommand(insertString, conn1);
         cmd.ExecuteNonQuery();
        }
      scope.Complete();
    }
 }

 void SecondMethod()
 {
    using(TransactionScope scope = new TransactionScope(TransactionScopeOption.Required))
   {
       using (SqlConnection conn2 = new SqlConnection("Data Source=(local);Initial Catalog=Northwind;Integrated Security=SSPI")) 
       {
     string insertString = @"
             insert into Categories
             (CategoryName, Description)
             values ('Laptop2', 'Model002')";

         conn2.Open();  //Looks like transactionabortedException is happening here
         SqlCommand cmd = new SqlCommand(insertString, conn2);
         cmd.ExecuteNonQuery();
        }
        scope.Complete();
    }
  }

有时候，交易失败了，没有提升到DTC，我们得到以下内部堆栈跟踪，

System.Transactions.TransactionAbortedException: The transaction has aborted. ---> 
System.Transactions.TransactionPromotionException: Failure while attempting to promote transaction. ---> 
System.InvalidOperationException: The requested operation cannot be completed because the connection has been broken.     
at System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransaction(TransactionRequest transactionRequest, String name, IsolationLevel iso, SqlInternalTransaction internalTransaction, Boolean isDelegateControlRequest)     
at System.Data.SqlClient.SqlDelegatedTransaction.Promote()     --- End of inner exception stack trace ---     
at System.Data.SqlClient.SqlDelegatedTransaction.Promote()     
at System.Transactions.TransactionStatePSPEOperation.PSPEPromote(InternalTransaction tx)     
at System.Transactions.TransactionStateDelegatedBase.EnterState(InternalTransaction tx)     
--- End of inner exception stack trace ---     
at System.Transactions.TransactionStateAborted.CreateAbortingClone(InternalTransaction tx)     
at System.Transactions.DependentTransaction..ctor(IsolationLevel isoLevel, InternalTransaction internalTransaction, Boolean blocking)     
at System.Transactions.Transaction.DependentClone(DependentCloneOption cloneOption)     
at System.Transactions.TransactionScope.SetCurrent(Transaction newCurrent)     
at System.Transactions.TransactionScope.PushScope()     
at System.Transactions.TransactionScope..ctor(TransactionScopeOption scopeOption)

有人可以帮我弄清楚这次失败的原因吗？

Answer 1

如果你使用TransactionScope：

打开多个与数据库的连接，
正在连接到SQL Server 2005服务器

交易将升级为DTC。检查另一个问题：TransactionScope automatically escalating to MSDTC on some machines?

解决方案是：

使用SQL Server 2008或

使用SqlTransaction代替TransactionScope，就像前面的答案所示：

using (var conn = new SqlConnection(connectionString))
{  
    using (var tx = conn.BeginTransaction())
    {
        FirstMethod(conn);
        SecondMethod(conn);
        tx.Commit();
    }
}

Answer 2

我可以向您建议一个更好的方法来实现您的目标。每个连接应该有2个DB调用的单个事务。

它应该像

using (SqlConnection conn1 = new SqlConnection("Data Source=(local);Initial Catalog=Northwind;Integrated Security=SSPI"))
{ 
    using (conn1.BeginTransaction()
    {
        try
        {
            FirstMethod(Conn1);
            SecondMethod(Conn2);
        }
        catch()
        {
        }
    }
}

使用TransactionScope：System.Transactions.TransactionAbortedException：事务已中止

2 个答案: