2008-12-04 74 views
2

我在问自己是否有可能检查ADO.NET中是否可以回滚当前事务。ADO.NET检查是否可能回滚

在MSDN提出以下建议执行:

private static void ExecuteSqlTransaction(string connectionString) 
{ 
    using (SqlConnection connection = new SqlConnection(connectionString)) 
    { 
     connection.Open(); 

     SqlCommand command = connection.CreateCommand(); 
     SqlTransaction transaction; 

     // Start a local transaction. 
     transaction = connection.BeginTransaction("SampleTransaction"); 

     // Must assign both transaction object and connection 
     // to Command object for a pending local transaction 
     command.Connection = connection; 
     command.Transaction = transaction; 

     try 
     { 
      command.CommandText = 
       "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')"; 
      command.ExecuteNonQuery(); 
      command.CommandText = 
       "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')"; 
      command.ExecuteNonQuery(); 

      // Attempt to commit the transaction. 
      transaction.Commit(); 
      Console.WriteLine("Both records are written to database."); 
     } 
     catch (Exception ex) 
     { 
      Console.WriteLine("Commit Exception Type: {0}", ex.GetType()); 
      Console.WriteLine(" Message: {0}", ex.Message); 

      // Attempt to roll back the transaction. 
      try 
      { 
       transaction.Rollback(); 
      } 
      catch (Exception ex2) 
      { 
       // This catch block will handle any errors that may have occurred 
       // on the server that would cause the rollback to fail, such as 
       // a closed connection. 
       Console.WriteLine("Rollback Exception Type: {0}", ex2.GetType()); 
       Console.WriteLine(" Message: {0}", ex2.Message); 
      } 
     } 
    } 
} 

此外,还有注:回滚当一个事务 的try/catch异常处理应始终使用。如果连接终止或者事务已在服务器上回滚,则回滚会生成InvalidOperationException。

但我不能真正相信try/catch是推荐的解决方案来检查回滚是否可能。

我知道在SQL Server实现中,如果事务是“僵尸”,则SQLTransaction对象在Connection属性上返回null。

但是,这是相当具体的实现,它只适用于SQL Server。

那么,是否有一个数据库独立的方式来检测事务是否可以回滚?

TIA 马丁

回答

1

很多这种复杂性是通过使用在“使用”的声明一个TransactionScope对象处理 - 检查出来的MSDN。有一点需要注意的是,一旦TransactionScope被认为是必要的,TransactionScope会自动“扩大”使用分布式事务 - 有时这是需要的,而其他时间则不是这样,因此如果您嵌套TransactionScopes,请小心。

0

问题是,在非SQL 2005中,transactionscope被提升为分布式事务,这是相当的开销。