Question

我正在创建一个新的应用程序，并且试图将DateTime数据类型插入SQLServer。错误显示

从字符串转换日期和/或时间时转换失败。

代码：

string Insertcmd = "INSERT INTO PatientPay (PatientID, Cash, AmountPaid, 
PaymentDate, Reseaon, StaffID) Values (@StaffID, @Cash, @AmountPaid, 
        @type, @PaymentDate, @StaffID)";
        cmd = new SqlCommand(Insertcmd, con);

        SqlParameter[] param = new SqlParameter[6];
        param[0] = new SqlParameter("@PatientID", SqlDbType.Int);
        param[0].Value = PatientID;

        param[1] = new SqlParameter("@Cash", SqlDbType.Float);
        param[1].Value = Cash;

        param[2] = new SqlParameter("@AmountPaid", SqlDbType.Float);
        param[2].Value = AmountPaid;

        param[3] = new SqlParameter("@type", SqlDbType.NVarChar, 255);
        param[3].Value = type;

        param[4] = new SqlParameter("@PaymentDate", SqlDbType.DateTime);
        param[4].Value = Convert.ToDateTime( DateTime.Now.ToString("yyyy- 
        MM-dd 00:00:00"));  // Error

        param[5] = new SqlParameter("@StaffID", SqlDbType.Int, 255);
        param[5].Value = StaffID;
        //Open the connection to database
        con.Open();

        try
        {
            if (con.State == System.Data.ConnectionState.Open)
            {
                //Execute the Adding process
                cmd.Parameters.AddRange(param);
                cmd.ExecuteNonQuery();
             }
         }catch{}

Answer 1

只需使用

param[4].Value = DateTime.Now;

代替

param[4].Value = Convert.ToDateTime( DateTime.Now.ToString("yyyy- 
    MM-dd 00:00:00"));

如果您需要删除时间部分，请使用：

param[4].Value = DateTime.Now.Date;

或作为评论中提到的 @DBro

param[4].Value = DateTime.Today;

更新1

如果您在传递date参数时遇到问题，请尝试使用以下sql命令而不传递PaymentDate参数：

string Insertcmd = "INSERT INTO PatientPay (PatientID, Cash, AmountPaid, 
PaymentDate, Reseaon, StaffID) Values (@StaffID, @Cash, @AmountPaid, 
        @type, DATEADD(dd, DATEDIFF(dd, 0, getdate()), 0), @StaffID)";

整个代码将是：

string Insertcmd = "INSERT INTO PatientPay (PatientID, Cash, AmountPaid, 
PaymentDate, Reseaon, StaffID) Values (@StaffID, @Cash, @AmountPaid, 
        @type, DATEADD(dd, DATEDIFF(dd, 0, getdate()), 0), @StaffID)";
    cmd = new SqlCommand(Insertcmd, con);

    SqlParameter[] param = new SqlParameter[5];
    param[0] = new SqlParameter("@PatientID", SqlDbType.Int);
    param[0].Value = PatientID;

    param[1] = new SqlParameter("@Cash", SqlDbType.Float);
    param[1].Value = Cash;

    param[2] = new SqlParameter("@AmountPaid", SqlDbType.Float);
    param[2].Value = AmountPaid;

    param[3] = new SqlParameter("@type", SqlDbType.NVarChar, 255);
    param[3].Value = type;

    param[4] = new SqlParameter("@StaffID", SqlDbType.Int, 255);
    param[4].Value = StaffID;
    //Open the connection to database
    con.Open();

    try
    {
        if (con.State == System.Data.ConnectionState.Open)
        {
            //Execute the Adding process
            cmd.Parameters.AddRange(param);
            cmd.ExecuteNonQuery();
         }
     }catch{}

参考

Best approach to remove time part of datetime in SQL Server

更新2

由于您要在PaymentDate列中插入thr @type参数，因此必须对SQL命令中的参数进行重新排序。

如何解决该错误“从字符串转换日期和/或时间时转换失败”

1 个答案: