C# 将数据从excel导入数据库mysql-如何以yyyy MM dd HH:MM:ss格式插入cmd DateTime参数

这次我在excel工作簿中创建了类似“Sheet5”的内容：

当我将数据从这个excel加载到datagridview时，我得到了这个视图（当然是在datagridview中）：

然后我想在MYSQL数据库中插入：

for (int i = 0; i < datagrdStatus_order.Rows.Count; i++)
{
MySqlCommand cmd = new MySqlCommand("INSERT INTO project1.order_status(ID_WORKER, ID_ORDER, ID_MODULE, ID_PROJECT, AMOUNT_OF_PRODUCTS, BEGIN_DATE, END_DATE) SELECT workers.ID_WORKER, orders.ID_ORDER, module.ID_MODULE, projects.ID, @AMOUNT_OF_PRODUCTS, @BEGIN_DATE, @END_DATE FROM project1.workers INNER JOIN project1.orders INNER JOIN project1.modules INNER JOIN project1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND orders.ORDER_DESC = @ORDER_DESC AND orders.ORDER_NUMBER = @ORDER_NUMBER AND modules.NAME = @MODULES_NAME AND projects.PROJECT_NAME = @PROJECT_NAME", connection);
cmd.Parameters.Add("@FNAME", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[0].Value.ToString();
cmd.Parameters.Add("@LNAME", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[1].Value.ToString();
cmd.Parameters.Add("@ORDER_DESC", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[2].Value.ToString();
cmd.Parameters.Add("@ORDER_NUMBER", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[3].Value.ToString();
cmd.Parameters.Add("@MODULES_NAME", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[4].Value.ToString();
cmd.Parameters.Add("@PROJECT_NAME", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[5].Value.ToString();
cmd.Parameters.Add("@AMOUNT_OF_PRODUCTS", MySqlDbType.Int64).Value = datagrdStatus_order.Rows[i].Cells[6].Value.ToString();
cmd.Parameters.AddWithValue("@BEGIN_DATE", MySqlDbType.DateTime).Value = datagrdStatus_order.Rows[i].Cells[7].Value.ToString();
cmd.Parameters.AddWithValue("@END_DATE", MySqlDbType.DateTime).Value = datagrdStatus_order.Rows[i].Cells[8].Value.ToString();
cmd.ExecuteNonQuery();
}

我得到一个错误：

“ToString”方法的重载不会占用以下数量的 论据：“1”

问题就在这里：

cmd.Parameters.AddWithValue("@BEGIN_DATE", MySqlDbType.DateTime).Value = datagrdStatus_order.Rows[i].Cells[7].Value.ToString("yyyy-MM-dd HH:mm:ss");
cmd.Parameters.AddWithValue("@END_DATE", MySqlDbType.DateTime).Value = datagrdStatus_order.Rows[i].Cells[8].Value.ToString("yyyy-MM-dd HH:mm:ss");

我不知道我能做什么？我能指望有人帮忙吗？Thx提前

这是我的代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
using System.Collections;
using System.Data.OleDb;
using System.IO;
using System.Configuration;

namespace ControlDataBase
{
    public partial class New_Tables : Form
    {
        public New_Tables()
        {
            InitializeComponent();
        }
        Form1 frm1 = (Form1)Application.OpenForms["Form1"];

        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void ImportData_Click(object sender, EventArgs e)
        {
            using (OpenFileDialog ofd = new OpenFileDialog() { Filter = "Excel Files|*.xlsx;*.xlsm;*.xlsb;*.xltx;*.xltm;*.xls;*.xlt;*.xls;*.xml;*.xml;*.xlam;*.xla;*.xlw;*.xlr;", ValidateNames = true })
            {
                if (ofd.ShowDialog() == DialogResult.OK)
                {
                    FileInfo fi = new FileInfo(ofd.FileName);
                    string FileName1 = ofd.FileName;

                    string excel = fi.FullName;

                    if (ofd.FileName.EndsWith(".xlsx"))
                    {
                        StrConn = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + excel + ";Extended Properties=\"Excel 12.0;\"";
                    }

                    if (ofd.FileName.EndsWith(".xls"))
                    {
                        StrConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + excel + ";Extended Properties=\"Excel 1.0;HDR=Yes;IMEX=1\"";
                    }
                    OleDbConnection oledbconn = new OleDbConnection(StrConn);

                    OleDbDataAdapter dta5 = new OleDbDataAdapter("SELECT * FROM [Sheet5$]", oledbconn);
                    oledbconn.Open();

                    DataSet dsole5 = new DataSet();
                    dta5.Fill(dsole5, "Sheet5$");
                    datagrdStatus_order.DataSource = dsole5.Tables["Sheet5$"];

                    oledbconn.Close();

                    MySqlConnection connection = new MySqlConnection("datasource=localhost;port=3306;username=root;password=");
                    connection.Open();

                    for (int i = 0; i < datagrdStatus_order.Rows.Count; i++)
                    {
                        MySqlCommand cmd = new MySqlCommand("INSERT INTO project1.order_status(ID_WORKER, ID_ORDER, ID_MODULE, ID_PROJECT, AMOUNT_OF_PRODUCTS, BEGIN_DATE, END_DATE) SELECT workers.ID_WORKER, orders.ID_ORDER, module.ID_MODULE, projects.ID, @AMOUNT_OF_PRODUCTS, @BEGIN_DATE, @END_DATE FROM project1.workers INNER JOIN project1.orders INNER JOIN project1.modules INNER JOIN project1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND orders.ORDER_DESC = @ORDER_DESC AND orders.ORDER_NUMBER = @ORDER_NUMBER AND modules.NAME = @MODULES_NAME AND projects.PROJECT_NAME = @PROJECT_NAME", connection);
                        cmd.Parameters.Add("@FNAME", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[0].Value.ToString();
                        cmd.Parameters.Add("@LNAME", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[1].Value.ToString();
                        cmd.Parameters.Add("@ORDER_DESC", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[2].Value.ToString();
                        cmd.Parameters.Add("@ORDER_NUMBER", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[3].Value.ToString();
                        cmd.Parameters.Add("@MODULES_NAME", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[4].Value.ToString();
                        cmd.Parameters.Add("@PROJECT_NAME", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[5].Value.ToString();
                        cmd.Parameters.Add("@AMOUNT_OF_PRODUCTS", MySqlDbType.Int64).Value = datagrdStatus_order.Rows[i].Cells[6].Value.ToString();
                        cmd.Parameters.AddWithValue("@BEGIN_DATE", MySqlDbType.DateTime).Value = datagrdStatus_order.Rows[i].Cells[7].Value.ToString("yyyy-MM-dd HH:mm:ss");
                        cmd.Parameters.AddWithValue("@END_DATE", MySqlDbType.DateTime).Value = datagrdStatus_order.Rows[i].Cells[8].Value.ToString("yyyy-MM-dd HH:mm:ss");
                        cmd.ExecuteNonQuery();
                    }
                    connection.Close();
                    MessageBox.Show("The data are imported correctly");

                    loaddataalldatagridview();
                }
            }
        }

        private void loaddataalldatagridview()
        {
            frm1.loaddata5();
        }
    }
}

---

这次我能指望得到帮助吗？谢谢大家!

可能

datagrdStatus_order.Rows[i].Cells[X].Value

返回该列的

对象，而不是
DateTime
。因为没有将字符串作为参数的重载，所以会出现此错误

“ToString”方法的重载不会占用以下数量的
论据：“1”

这就是为什么您需要首先强制转换它-如果您不能，解析它-然后您需要像这样分配它

if(datagrdStatus_order.Rows[i].Cells[7].Value is DateTime)
   cmd.Parameters.AddWithValue("@BEGIN_DATE", MySqlDbType.DateTime).Value = 
                                 (DateTime)datagrdStatus_order.Rows[i].Cells[7].Value;

或者你可以直接解析它（最好是使用
DateTime.ParseExact
），这对格式很重要。
好的，我正在考虑这个解决方案，我刚刚在我自己的thx上找到了它（在下面）寻求帮助：）

for（int i=0；i
您的意思是要修改“for datagrdStatus_order”循环中的最后两行代码吗？请稍候-我已将这些“for循环”中的最后两行代码修改为：`if（datagrdStatus_zl.Rows[i].Cells[7]。值为DateTime）cmd.Parameters.AddWithValue（@BEGIN_DATE），MySqlDbType.DateTime）。值=（DateTime）datagrdStatus_zl.Rows[i]。单元格[7]。值；if（datagrdStatus_zl.Rows[i]。单元格[8]。值为DateTime）cmd.Parameters.AddWithValue（@END_DATE），MySqlDbType.DateTime）。值=（DateTime）datagrdStatus_zl.Rows[i]。单元格[8].Value；`然后我得到`System.InvalidCastException:从'DateTime'元素到'Int32'元素的投影不正确。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
using System.Collections;
using System.Data.OleDb;
using System.IO;
using System.Configuration;

namespace ControlDataBase
{
    public partial class New_Tables : Form
    {
        public New_Tables()
        {
            InitializeComponent();
        }
        Form1 frm1 = (Form1)Application.OpenForms["Form1"];

        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void ImportData_Click(object sender, EventArgs e)
        {
            using (OpenFileDialog ofd = new OpenFileDialog() { Filter = "Excel Files|*.xlsx;*.xlsm;*.xlsb;*.xltx;*.xltm;*.xls;*.xlt;*.xls;*.xml;*.xml;*.xlam;*.xla;*.xlw;*.xlr;", ValidateNames = true })
            {
                if (ofd.ShowDialog() == DialogResult.OK)
                {
                    FileInfo fi = new FileInfo(ofd.FileName);
                    string FileName1 = ofd.FileName;

                    string excel = fi.FullName;

                    if (ofd.FileName.EndsWith(".xlsx"))
                    {
                        StrConn = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + excel + ";Extended Properties=\"Excel 12.0;\"";
                    }

                    if (ofd.FileName.EndsWith(".xls"))
                    {
                        StrConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + excel + ";Extended Properties=\"Excel 1.0;HDR=Yes;IMEX=1\"";
                    }
                    OleDbConnection oledbconn = new OleDbConnection(StrConn);

                    OleDbDataAdapter dta5 = new OleDbDataAdapter("SELECT * FROM [Sheet5$]", oledbconn);
                    oledbconn.Open();

                    DataSet dsole5 = new DataSet();
                    dta5.Fill(dsole5, "Sheet5$");
                    datagrdStatus_order.DataSource = dsole5.Tables["Sheet5$"];

                    oledbconn.Close();

                    MySqlConnection connection = new MySqlConnection("datasource=localhost;port=3306;username=root;password=");
                    connection.Open();

                    for (int i = 0; i < datagrdStatus_order.Rows.Count; i++)
                    {
                        MySqlCommand cmd = new MySqlCommand("INSERT INTO project1.order_status(ID_WORKER, ID_ORDER, ID_MODULE, ID_PROJECT, AMOUNT_OF_PRODUCTS, BEGIN_DATE, END_DATE) SELECT workers.ID_WORKER, orders.ID_ORDER, module.ID_MODULE, projects.ID, @AMOUNT_OF_PRODUCTS, @BEGIN_DATE, @END_DATE FROM project1.workers INNER JOIN project1.orders INNER JOIN project1.modules INNER JOIN project1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND orders.ORDER_DESC = @ORDER_DESC AND orders.ORDER_NUMBER = @ORDER_NUMBER AND modules.NAME = @MODULES_NAME AND projects.PROJECT_NAME = @PROJECT_NAME", connection);
                        cmd.Parameters.Add("@FNAME", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[0].Value.ToString();
                        cmd.Parameters.Add("@LNAME", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[1].Value.ToString();
                        cmd.Parameters.Add("@ORDER_DESC", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[2].Value.ToString();
                        cmd.Parameters.Add("@ORDER_NUMBER", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[3].Value.ToString();
                        cmd.Parameters.Add("@MODULES_NAME", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[4].Value.ToString();
                        cmd.Parameters.Add("@PROJECT_NAME", MySqlDbType.VarChar).Value = datagrdStatus_order.Rows[i].Cells[5].Value.ToString();
                        cmd.Parameters.Add("@AMOUNT_OF_PRODUCTS", MySqlDbType.Int64).Value = datagrdStatus_order.Rows[i].Cells[6].Value.ToString();
                        cmd.Parameters.AddWithValue("@BEGIN_DATE", MySqlDbType.DateTime).Value = datagrdStatus_order.Rows[i].Cells[7].Value.ToString("yyyy-MM-dd HH:mm:ss");
                        cmd.Parameters.AddWithValue("@END_DATE", MySqlDbType.DateTime).Value = datagrdStatus_order.Rows[i].Cells[8].Value.ToString("yyyy-MM-dd HH:mm:ss");
                        cmd.ExecuteNonQuery();
                    }
                    connection.Close();
                    MessageBox.Show("The data are imported correctly");

                    loaddataalldatagridview();
                }
            }
        }

        private void loaddataalldatagridview()
        {
            frm1.loaddata5();
        }
    }
}

for (int i = 0; i < datagrdStatus_order.Rows.Count; i++)
                    {
                        MySqlCommand cmd = new MySqlCommand("INSERT INTO project1.order_status(ID_WORKER, ID_ORDER, ID_MODULE, ID_PROJECT, AMOUNT_OF_PRODUCTS, BEGIN_DATE, END_DATE) SELECT workers.ID_WORKER, orders.ID_ORDER, module.ID_MODULE, projects.ID, @AMOUNT_OF_PRODUCTS, @BEGIN_DATE, @END_DATE FROM project1.workers INNER JOIN project1.orders INNER JOIN project1.modules INNER JOIN project1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND orders.ORDER_DESC = @ORDER_DESC AND orders.ORDER_NUMBER = @ORDER_NUMBER AND modules.NAME = @MODULES_NAME AND projects.PROJECT_NAME = @PROJECT_NAME", connection);
                        cmd.Parameters.AddWithValue("@FNAME", datagrdStatus_order.Rows[i].Cells[0].Value);
                        cmd.Parameters.AddWithValue("@LNAME", datagrdStatus_order.Rows[i].Cells[1].Value);
                        cmd.Parameters.AddWithValue("@ORDER_DESC", datagrdStatus_order.Rows[i].Cells[2].Value);
                        cmd.Parameters.AddWithValue("@NUMBER_ORDER", datagrdStatus_order.Rows[i].Cells[3].Value);
                        cmd.Parameters.AddWithValue("@MODULES_NAME", datagrdStatus_order.Rows[i].Cells[4].Value);
                        cmd.Parameters.AddWithValue("@PROJECT_NAME", datagrdStatus_order.Rows[i].Cells[5].Value);
                        cmd.Parameters.AddWithValue("@AMOUNT_OF_PRODUCTS", datagrdStatus_order.Rows[i].Cells[6].Value);
                        cmd.Parameters.AddWithValue("@BEGIN_DATE", (DateTime)datagrdStatus_order.Rows[i].Cells[7].Value);
                        cmd.Parameters.AddWithValue("@END_DATE", (DateTime)datagrdStatus_order.Rows[i].Cells[8].Value);
                    }

cmd.Parameters.AddWithValue("@BEGIN_DATE", (DateTime)datagrdStatus_order.Rows[i].Cells[7].Value);

if(datagrdStatus_order.Rows[i].Cells[7].Value is DateTime)
   cmd.Parameters.AddWithValue("@BEGIN_DATE", MySqlDbType.DateTime).Value = 
                                 (DateTime)datagrdStatus_order.Rows[i].Cells[7].Value;

for (int i = 0; i < datagrdStatus_order.Rows.Count; i++)
                    {
                        MySqlCommand cmd = new MySqlCommand("INSERT INTO project1.order_status(ID_WORKER, ID_ORDER, ID_MODULE, ID_PROJECT, AMOUNT_OF_PRODUCTS, BEGIN_DATE, END_DATE) SELECT workers.ID_WORKER, orders.ID_ORDER, module.ID_MODULE, projects.ID, @AMOUNT_OF_PRODUCTS, @BEGIN_DATE, @END_DATE FROM project1.workers INNER JOIN project1.orders INNER JOIN project1.modules INNER JOIN project1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND orders.ORDER_DESC = @ORDER_DESC AND orders.ORDER_NUMBER = @ORDER_NUMBER AND modules.NAME = @MODULES_NAME AND projects.PROJECT_NAME = @PROJECT_NAME", connection);
                    DateTime begin_date = Convert.ToDateTime(datagrdStatus_zl.Rows[i].Cells[7].Value);
                    DateTime end_date = Convert.ToDateTime(datagrdStatus_zl.Rows[i].Cells[8].Value);
                        cmd.Parameters.AddWithValue("@FNAME", datagrdStatus_order.Rows[i].Cells[0].Value);
                        cmd.Parameters.AddWithValue("@LNAME", datagrdStatus_order.Rows[i].Cells[1].Value);
                        cmd.Parameters.AddWithValue("@ORDER_DESC", datagrdStatus_order.Rows[i].Cells[2].Value);
                        cmd.Parameters.AddWithValue("@NUMBER_ORDER", datagrdStatus_order.Rows[i].Cells[3].Value);
                        cmd.Parameters.AddWithValue("@MODULES_NAME", datagrdStatus_order.Rows[i].Cells[4].Value);
                        cmd.Parameters.AddWithValue("@PROJECT_NAME", datagrdStatus_order.Rows[i].Cells[5].Value);
                        cmd.Parameters.AddWithValue("@AMOUNT_OF_PRODUCTS", datagrdStatus_order.Rows[i].Cells[6].Value);
                        cmd.Parameters.AddWithValue("@BEGIN_DATE", begin_date);
                        cmd.Parameters.AddWithValue("@END_DATE", end_date);
                    }