C#如何捕获错误并调试准备好的语句
本文关键字:准备好 语句 调试 何捕获 错误 | 更新日期: 2023-09-27 18:25:44
嗨,下面是我的带有多插入语句的C#代码片段。我把它们放在一个事务括号中,并使用预先准备好的语句。例如,我的挑战是,我知道我现在在cmdText3中遇到了问题,但没有生成任何错误消息。在这种情况下,我应该如何添加额外的try-and-catch来帮助我调试并提醒我错误?在准备好的语句中,我能看到用数据执行的确切查询是什么吗?
myCon getMyCon1=新建myCon();MySqlConnection con=getMyCon1.GetConnection();
using (MySqlTransaction trans = con.BeginTransaction())
{
try
{
long rID = 0;
String cmdText1 = "INSERT INTO record1(fiscalPeriod,financialYear) VALUES(@fiscalPeriod,@financialYear)";
using (MySqlCommand cmd = new MySqlCommand(cmdText1, con, trans))
{
cmd.Parameters.AddWithValue("@fiscalPeriod", fiscalPeriod.SelectedValue);
cmd.Parameters.AddWithValue("@financialYear", financialYear.SelectedValue);
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
rID = cmd.LastInsertedId;
}
foreach (object line in linesC)
{
if (line.GetType() == typeof(TypeC))
{
TypeC typesC = (TypeC)line;
String companyName = typesC.comName;
String periodStart = typesC.periodStart;
String periodEnd = typesC.periodEnd;
String cmdText2 = "INSERT INTO record2(rID,companyName,,periodStart,periodEnd,) VALUES(@rID,@companyName,@periodStart,@periodEnd)";
using (MySqlCommand cmd = new MySqlCommand(cmdText2, con, trans))
{
cmd.Parameters.AddWithValue("@rID", rID);
cmd.Parameters.AddWithValue("@companyName", companyName);
cmd.Parameters.AddWithValue("@periodStart", periodStart);
cmd.Parameters.AddWithValue("@periodEnd", periodEnd);
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
}
}
}
foreach (object line in linesP)
{
if (line.GetType() == typeof(TypeP))
{
TypeP typesP = (TypeP)line;
String supplierName = typesP.supName;
String invoiceDate = typesP.invoiceDate;
String invoiceNo = typesP.invoiceNo;
String cmdText3 = "INSERT INTO record2(rID,supplierName,invoiceDate,invoiceNo) VALUES(@rID,@supplierName,@invoiceDate,@invoiceNo,)";
using (MySqlCommand cmd = new MySqlCommand(cmdText3, con, trans))
{
cmd.Parameters.AddWithValue("@rID", rID);
cmd.Parameters.AddWithValue("@supplierName", supplierName);
cmd.Parameters.AddWithValue("@invoiceDate", invoiceDate);
cmd.Parameters.AddWithValue("@invoiceNo", invoiceNo);
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
}
}
}
trans.Commit();
}
catch (Exception ex)
{
trans.Rollback();
}
}
con.Close()
您可以使用Sql Profiler应用程序查看确切的查询。这将允许您查看生成的查询和来自Sql Server的响应。
https://msdn.microsoft.com/en-us/library/ms181091.aspx
以下内容:
String cmdText3 = "INSERT INTO record2(rID,supplierName,invoiceDate,invoiceNo) VALUES(@gafID,@supplierName,@invoiceDate,@invoiceNo,)";
与您在此处指定的第一个参数不一致:
cmd.Parameters.AddWithValue("@rID", rID);
cmd.Parameters.AddWithValue("@supplierName", supplierName);
cmd.Parameters.AddWithValue("@invoiceDate", invoiceDate);
cmd.Parameters.AddWithValue("@invoiceNo", invoiceNo);
替换:
VALUES(@gafID,@supplierName,@invoiceDate,@invoiceNo,)
带有:
VALUES(@rID,@supplierName,@invoiceDate,@invoiceNo)
或者,您可以重新命名:
cmd.Parameters.AddWithValue("@rID", rID);
收件人:
cmd.Parameters.AddWithValue("@gafID", rID);