我是VFP开发人员，试图拿起C＃。确定最快的学习方法是做，我为自己做了一个小练习。
目标
将某些事务从“实时”数据库移动到存档数据库中。
一般的想法是：
一开始就没事了，然后我突然碰到了一堵砖墙......
问题
我有一个名为RefCombo的变量，我用它来存储父键的主键，它存储在while (READ())语句之后和foreach循环之前。
在四个记录的测试数据库中，RefCombo字段应为：
read（）结果：Job1
预先列出的预定列表中的子表格
处理ChildTable1
处理ChildTable2
处理ChildTable3
处理ChildTable4
处理ChildTable5
然后重复Job2，Job3和Job4。
让我疯狂的是我得到了这个：
read（）结果：Job1
预先列出的预定列表中的子表格
处理ChildTable1
SKIP其他ChildTables，RefCombo（主键）成为Job2，循环回while read()
问题是，一旦它改变为Job2，它就会像我预期的那样继续工作，为每个剩余的父记录循环遍历每个子表。
我也得到了“当前的TransactionScope已经完成”。每隔一次我运行网页时出错。这发生在程序开始时的connection.open()部分，但很难确定，因为它不会一直发生。
我已经将代码发布在底部，它的排序很随意，但是任何帮助都会非常感激。我已经在这个工作了2天，真的买不起脱发，哈哈。
对我的代码的任何评论也会更受欢迎，我真的是C＃的新手并且每一点都有帮助：P
提前致谢。
#region Declaration
DateTime FromDate = Convert.ToDateTime("01/01/2011");
DateTime ToDate = Convert.ToDateTime("01/03/2011");
string conStrSource = @"Data Source=HOME\SQLEXPRESS;Initial Catalog=MCC_Live;Integrated Security=True";
// Declare a list of child tables to check and move together with the Job
List<String> TablesToMove = new List<String>();
{
TablesToMove.Add("JobItems");
TablesToMove.Add("JobTerms");
TablesToMove.Add("JobMessages");
TablesToMove.Add("JobCalcs");
TablesToMove.Add("JobContainers");
TablesToMove.Add("JobMetrics");
}
#endregion
#region Set SQL String
string QueryString =
"SELECT " +
"JobMaster.BranchID, JobMaster.JobNo, " +
"JobMaster.ImportDate, PermitStatus.CurrentStatus " +
"FROM JobMaster. " +
"INNER JOIN PermitStatus ON " +
"JobMaster.BranchID = PermitStatus.BranchID AND " +
"JobMaster.JobNo = PermitStatus.JobNo " +
"WHERE " +
"(JobMaster.ImportDate BETWEEN @FromDate AND @ToDate) AND " +
"PermitStatus.currentStatus NOT IN ('HT0', 'HT1', 'HT2')";
#endregion
// Display on web page for reference
ASPxFromDate.Value = FromDate;
ASPxToDate.Value = ToDate;
ASPxMemo1.Value = QueryString;
#region Open Connection, Get List of filtered Master Jobs
using (SqlConnection connection = new SqlConnection(conStrSource))
{
int JobCount = 0;
ASPxListBox1.Items.Clear();
ASPxListBox2.Items.Clear();
ASPxListBox3.Items.Clear();
ASPxListBox1.Columns.Clear();
SqlCommand command = new SqlCommand(QueryString, connection);
{
command.Parameters.Add(new SqlParameter("@FromDate", FromDate));
command.Parameters.Add(new SqlParameter("@ToDate", ToDate));
}
connection.Open();
SqlDataReader FilteredJobList = command.ExecuteReader();
#endregion
try // Process MasterJob File
{
// Process individual jobs one by one so I won't tie up memory and have better logging
while (FilteredJobList.Read())
{
#region Declare variables
string RefCombo = (string)FilteredJobList[0] + (string)FilteredJobList[1]; //Get primary key
JobCount = JobCount + 1;
ASPxTextBox2.Value = JobCount;
ASPxListBox2.Items.Add(RefCombo);
#endregion
// Start transaction scope
TransactionScope TranScope = new TransactionScope();
{
try
{
// Loop through child tables
foreach (string CurrentTable in TablesToMove)
{
#region Transfer child tables
// update list so I know which part its working on
ASPxListBox1.Items.Add(CurrentTable);
RefCombo = (string)FilteredJobList[0] + (string)FilteredJobList[1];
string RefTableNow = (string)CurrentTable;
bool CancelTrans = false;
MoveChild(ref RefCombo, ref RefTableNow, ref conStrSource, ref CancelTrans);
if (CancelTrans == false)
{ //LogFailure();
break;
}
DelChild(ref RefCombo, ref RefTableNow, ref conStrSource, ref CancelTrans);
if (CancelTrans == false)
{ //LogFailure();
break;
}
#endregion
// Remove remaing entries
//MoveLatestStatus();
//DeleteLatestStatus();
//MoveMasterJob();
//DeleteMasterJob();
//LogSuccess();
TranScope.Complete();
}
catch
{
//LogFailure();
}
}
}
finally
{
FilteredJobList.Close();
}
}
}
//------------------------------------------------------------------------------------------------
private void MoveChild(ref string RefCombo, ref string CurrentTable, ref string conStrSource, ref bool CancelTrans)
{
#region Define Insert String
string InsertSqlString =
"INSERT INTO [MCC_History].[dbo].[" + @CurrentTable + "]" +
" SELECT * FROM [MCC_Live].[dbo].[" + @CurrentTable + "] s" +
" WHERE NOT EXISTS" +
" (SELECT 1 FROM [MCC_History].[dbo].[" + @CurrentTable + "] t2" +
" WHERE t2.BranchID + t2.JobNo = s.BranchID + s.JobNo)" +
" AND s.BranchID + s.JobNo = @RefCombo";
#endregion
#region Open connection and execute query
using (SqlConnection MoveConnect = new SqlConnection(conStrSource))
{
try
{
SqlCommand InsertCommand = new SqlCommand(InsertSqlString, MoveConnect);
{
InsertCommand.Parameters.Add(new SqlParameter("@RefCombo", RefCombo));
}
MoveConnect.Open();
InsertCommand.ExecuteNonQuery();
}
catch
{
CancelTrans = true;
}
}
#endregion
}
//------------------------------------------------------------------------------------------------
private void DeleteChild(ref string RefCombo, ref string CurrentTable, ref string conStrSource, ref bool CancelTrans)
{
#region Define Delete query
string DeleteSqlString =
" DELETE FROM [MCC_Live].[dbo].[" + @CurrentTable + "]" +
" WHERE [MCC_Live].[dbo].[" + @CurrentTable +
"].BranchID + [MCC_DB].[dbo].[" + @CurrentTable + "].JobNo = @RefCombo";
#endregion
#region Execute Delete query
using (SqlConnection MoveConnect = new SqlConnection(conStrSource))
{
try
{
SqlCommand InsertCommand = new SqlCommand(DeleteSqlString, MoveConnect);
{
InsertCommand.Parameters.Add(new SqlParameter("@RefCombo", RefCombo));
}
MoveConnect.Open();
InsertCommand.ExecuteNonQuery();
}
catch
{
CancelTrans = true;
}
}
#endregion
}
答案 0 :(得分：0)
问题在于您拥有TranScope.Complete();声明。它在你的foreach循环内部，它在你的Foreach块退出后属于它。您在列表的第一次迭代结束时完成交易。这可以防止您通过此事务再发出任何命令。