c# - SQL INSERT 奇怪地跳过第一条记录

Question

我正在从另一个类中获取对象列表，并在我的插入查询中使用它。

不知怎么的，我得到了一个奇怪的“错误”，因为列表中的第一个对象没有被插入。

如果有人能发现我的错误，我会很高兴!一段时间以来，我一直在用头敲打键盘......

        var ActNoParam = new SqlParameter();
        ActNoParam.ParameterName = "@ActNo";
        ActNoParam.SqlDbType = SqlDbType.Int;
        cmd.Parameters.Add(ActNoParam);

        var CustNoParam = new SqlParameter();
        CustNoParam.ParameterName = "@CustNo";
        CustNoParam.SqlDbType = SqlDbType.Int;
        cmd.Parameters.Add(CustNoParam);

        var DelpriParam = new SqlParameter();
        DelpriParam.ParameterName = "@DelPri";
        DelpriParam.SqlDbType = SqlDbType.Int;
        cmd.Parameters.Add(DelpriParam);

        var CustPrg3Param = new SqlParameter();
        CustPrg3Param.ParameterName = "@CustPrg3";
        CustPrg3Param.SqlDbType = SqlDbType.Int;
        cmd.Parameters.Add(CustPrg3Param);

        var NmParam = new SqlParameter();
        NmParam.ParameterName = "@Nm";
        NmParam.SqlDbType = SqlDbType.VarChar;
        cmd.Parameters.Add(NmParam);

        var Gr6Param = new SqlParameter();
        Gr6Param.ParameterName = "@Gr6";
        Gr6Param.SqlDbType = SqlDbType.Int;
        cmd.Parameters.Add(Gr6Param);

        var CreUsrParam = new SqlParameter();
        CreUsrParam.ParameterName = "@CreUsr";
        CreUsrParam.SqlDbType = SqlDbType.VarChar;
        cmd.Parameters.Add(CreUsrParam);

        var CreDtParam = new SqlParameter();
        CreDtParam.ParameterName = "@CreDt";
        CreDtParam.SqlDbType = SqlDbType.Int;
        cmd.Parameters.Add(CreDtParam);

        for (int i = 1; i < customers.Count; i++)
        {
            cmd.CommandText =
            @"IF NOT EXISTS (SELECT 1 FROM dbo.Actor WHERE DelPri = @DelPri AND CustPrg3 = @CustPrg3) 
                     INSERT INTO dbo.Actor(ActNo, CustNo, DelPri, CustPrg3, Nm, Gr6, CreDt, CreUsr) 
                     VALUES(@ActNo, @CustNo, @DelPri, @CustPrg3, @Nm, @Gr6, @CreDt, @CreUsr);";


            ActNoParam.Value = customers[i].ActNo; //   <<< THIS IS WHERE YOUR NUMERIC VALUE GOES. 
            CustNoParam.Value = customers[i].CustNo; //   <<< THIS IS WH ERE YOUR NUMERIC VALUE GOES. 
            DelpriParam.Value = Int32.Parse(customers[i].DelPri); //   <<< THIS IS WHERE YOUR NUMERIC VALUE GOES.
            CustPrg3Param.Value = customers[i].CustPrg3; //   <<< THIS IS WHERE YOUR NUMERIC VALUE GOES.
            NmParam.Value = customers[i].Nm; //   <<< THIS IS WHERE YOUR NUMERIC VALUE GOES. 
            Gr6Param.Value = customers[i].Gr6; //   <<< THIS IS WHERE YOUR NUMERIC VALUE GOES. 

            CreDtParam.Value = customers[i].CreDt; //   <<< THIS IS WHERE YOUR NUMERIC VALUE GOES. 
            CreUsrParam.Value = customers[i].CreUsr; //   <<< THIS IS WHERE YOUR NUMERIC VALUE GOES. 

           cmd.ExecuteNonQuery();
    }

我知道第一个对象被传递给了类，我已经尝试在循环中打印出当前对象的值，所以数据就在那里，但在插入时被跳过了。

此外，我很确定这不是由于 if not exists 查询引起的，因为我只检查了 12 位客户，我跑过他们来发现任何冲突。

我到底做错了什么？

感谢任何帮助! :)

Answer 1

您从索引 1 开始 for 循环，而 c# 是一种索引为 0 的语言。这意味着您实际上是从第二条记录开始的。

将您的 for 循环更改为:

for (int i = 0; i < customers.Count; i++)