ADO.NET检查是否可以回滚

时间:2008-12-04 12:24:53

标签: sql-server ado.net transactions rollback

我问自己是否可以检查ADO.NET中是否可以回滚当前事务。

msdn建议采用以下实现:

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);
            }
        }
    }
}

此外还有注释: 回滚事务时应始终使用Try / Catch异常处理。如果连接终止或者事务已在服务器上回滚,则Rollback会生成InvalidOperationException。

但我真的不相信try / catch是推荐的解决方案来检查是否可以回滚。

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。

但这是特定于实现的,它只适用于SQL Server。

是否有一种与数据库无关的方法来检测事务是否可以回滚?

TIA 马丁

2 个答案:

答案 0 :(得分:1)

很多这种复杂性是通过在“using”语句中使用TransactionScope对象来处理的 - 在MSDN上查看它。需要注意的是,TransactionScope会在认为必要时自动“向上扩展”以使用分布式事务 - 有时这是可取的,有时则不是,所以如果要嵌套TransactionScopes,请小心。

答案 1 :(得分:0)

问题是在非SQL 2005中,transactioncope被提升为分布式事务,这是一个相当大的开销。