-1

我正在尝试运行此代码

public Exception SetData(string Data , long NoOfColumnsAllowed)
    {
        try
        {
            con = new SqlCeConnection(conectionstring);
            con.Open();
            transaction = con.BeginTransaction();
            com = new SqlCeCommand();
            com.Transaction = transaction;
            com.CommandText = "Select  count(*) from [Copy]";
            com.Connection = con;
            sdr = com.ExecuteReader();
            while (sdr.Read())
            {
                noOfColumns = sdr.GetInt32(0);
            }


            if (noOfColumns > NoOfColumnsAllowed)
            {
                long NoOfColumsToBeDeleted = noOfColumns - NoOfColumnsAllowed;
                com.CommandText = "delete from [Copy] where Sno<=@sno";
                com.Parameters.AddWithValue("@sno", NoOfColumsToBeDeleted);
                com.ExecuteNonQuery();
            }

            com.CommandText = "Insert into [Copy] (Data) values (@data)";
            com.Parameters.AddWithValue("@data", Data);
            com.ExecuteNonQuery();
            transaction.Commit();
            con.Close();

            return null;
        }
        catch (Exception ex)
        {
            try
            {
                transaction.Rollback();
            }
            catch (Exception)
            {

            }
            con.Close();
            return ex;
        }


    }

发生异常 -

system.invalidoperationexception:如果在此事务的范围内有任何打开的游标,则无法提交该事务。确保在提交更改之前明确关闭所有数据读取器/结果集。

我是事务新手,无法找到有关打开游标的任何有价值的解决方案。代码有问题吗,或者我必须明确关闭数据阅读器,如果是,请告诉我怎么做?

4

1 回答 1

2

只需调用 sdr.Close(); 在while循环之后,因为这就是错误所抱怨的。

于 2013-03-23T12:03:18.190 回答