将数据从（大）文件Excel导入到datagridview，然后再导入数据库-为什么要插入数据库这么长时间并且不保存所有数据？

Question

将数据从（大）文件Excel导入到datagridview，然后再导入数据库-为什么要插入数据库这么长时间并且不保存所有数据？

Pro*_*991 3 c# mysql excel datetime large-data

在这种情况下，我将数据从大文件（大约37 MB）导入到datagridview中。Excel文件中的表在下面：

从Excel将数据加载到datagridview后，我将该数据插入MySQL数据库：

foreach (DataGridViewRow row in datagrdStatus_order.Rows)
{
    string constring = "datasource = localhost; port = 3306; username = root; password = ";
    using (MySqlConnection con = new MySqlConnection(constring))
    {
        using (MySqlCommand cmd = new MySqlCommand("INSERT IGNORE INTO try1.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 try1.workers INNER JOIN try1.orders INNER JOIN try1.modules INNER JOIN try1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND workers.ID_WORKER = @ID_WORKER AND orders.DESC_ORDER = @DESC_ORDER AND orders.ORDER_NUMBER = @ORDER_NUMBER AND modules.NAME = @MODULES_NAME AND projects.PROJECT_NAME = @PROJECT_NAME", con))
        {
            cmd.Parameters.AddWithValue("@ID_WORKER", row.Cells["ID_WORKER"].Value);
            cmd.Parameters.AddWithValue("@FNAME", row.Cells["FNAME"].Value);
            cmd.Parameters.AddWithValue("@LNAME", row.Cells["LNAME"].Value);
            cmd.Parameters.AddWithValue("@DESC_ORDER", row.Cells["DESC_ORDER"].Value);
            cmd.Parameters.AddWithValue("@ORDER_NUMBER", row.Cells["ORDER_NUMBER"].Value);
            cmd.Parameters.AddWithValue("@MODULES_NAME", row.Cells["NAME"].Value);
            cmd.Parameters.AddWithValue("@PROJECT_NAME", row.Cells["PROJECT_NAME"].Value);
            cmd.Parameters.AddWithValue("@AMOUNT_OF_PRODUCTS", row.Cells["AMOUNT_OF_PRODUCTS"].Value);
            cmd.Parameters.AddWithValue("@BEGIN_DATE", row.Cells["BEGIN_DATE"].Value);
            cmd.Parameters.AddWithValue("@END_DATE", row.Cells["END_DATE"].Value);
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
        }
    }
}

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稍后，当我执行此导入代码时，该问题就开始了。

尽管已关闭ContextSwitchDeadlock异常（仅可插入1个表），但插入此数据大约需要10分钟。
尽管未在程序中调用任何错误或异常，但它不会插入所有数据。在那种情况下，我看到我仅导入了8个状态，而并非全部（11个状态）。

我有一个问题：为什么插入数据库需要这么长时间并且不保存所有数据？如何减少将数据插入MySQL数据库并保存所有数据？

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 [Order_status$]", oledbconn);
                    oledbconn.Open();

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

                    oledbconn.Close();

foreach (DataGridViewRow row in datagrdStatus_order.Rows)
{
    string constring = "datasource = localhost; port = 3306; username = root; password = ";
    using (MySqlConnection con = new MySqlConnection(constring))
    {
        using (MySqlCommand cmd = new MySqlCommand("INSERT IGNORE INTO try1.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 try1.workers INNER JOIN try1.orders INNER JOIN try1.modules INNER JOIN try1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND workers.ID_WORKER = @ID_WORKER AND orders.DESC_ORDER = @DESC_ORDER AND orders.ORDER_NUMBER = @ORDER_NUMBER AND modules.NAME = @MODULES_NAME AND projects.PROJECT_NAME = @PROJECT_NAME", con))
        {
            cmd.Parameters.AddWithValue("@ID_WORKER", row.Cells["ID_WORKER"].Value);
            cmd.Parameters.AddWithValue("@FNAME", row.Cells["FNAME"].Value);
            cmd.Parameters.AddWithValue("@LNAME", row.Cells["LNAME"].Value);
            cmd.Parameters.AddWithValue("@DESC_ORDER", row.Cells["DESC_ORDER"].Value);
            cmd.Parameters.AddWithValue("@ORDER_NUMBER", row.Cells["ORDER_NUMBER"].Value);
            cmd.Parameters.AddWithValue("@MODULES_NAME", row.Cells["NAME"].Value);
            cmd.Parameters.AddWithValue("@PROJECT_NAME", row.Cells["PROJECT_NAME"].Value);
            cmd.Parameters.AddWithValue("@AMOUNT_OF_PRODUCTS", row.Cells["AMOUNT_OF_PRODUCTS"].Value);
            cmd.Parameters.AddWithValue("@BEGIN_DATE", row.Cells["BEGIN_DATE"].Value);
            cmd.Parameters.AddWithValue("@END_DATE", row.Cells["END_DATE"].Value);
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
        }
    }
}
                    connection.Close();
                    MessageBox.Show("The data are imported correctly");

                    loaddataalldatagridview();
                }
            }
        }

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

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编辑：

我已经修改了基于@Matt_Johnson答案的代码行：

1）在for循环中：

            string constring = "datasource = localhost; port = 3306; username = root; password = ";
            string query5 = "INSERT IGNORE INTO try1.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 try1.workers INNER JOIN try1.orders INNER JOIN try1.modules INNER JOIN try1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND workers.ID_WORKER = @ID_WORKER AND orders.DESC_ORDER = @DESC_ORDER AND orders.ORDER_NUMBER = @ORDER_NUMBER AND modules.NAME = @MODULES_NAME AND projects.PROJECT_NAME = @PROJECT_NAME";

            using (MySqlConnection con = new MySqlConnection(constring))
            {
                using (MySqlCommand cmd = new MySqlCommand(query5, con))
                {
                    cmd.Parameters.Add("@ID_WORKER", MySqlDbType.Int32);
                    cmd.Parameters.Add("@FNAME", MySqlDbType.VarChar);
                    cmd.Parameters.Add("@LNAME", MySqlDbType.VarChar);
                    cmd.Parameters.Add("@DESC_ORDER", MySqlDbType.VarChar);
                    cmd.Parameters.Add("@ORDER_NUMBER", MySqlDbType.VarChar);
                    cmd.Parameters.Add("@MODULES_NAME", MySqlDbType.VarChar);
                    cmd.Parameters.Add("@PROJECT_NAME", MySqlDbType.VarChar);
                    cmd.Parameters.Add("@AMOUNT_OF_PRODUCTS", MySqlDbType.Int32);
                    cmd.Parameters.Add("@BEGIN_DATE", MySqlDbType.DateTime);
                    cmd.Parameters.Add("@END_DATE", MySqlDbType.DateTime);
                    con.Open();

                    for (int i = 0; i < datagrdStatus_order.Rows.Count + 1; i++)
                    {
                        cmd.Parameters["@ID_WORKER"].Value = datagrdStatus_order.Rows[i].Cells[0].Value;
                        cmd.Parameters["@FNAME"].Value = datagrdStatus_order.Rows[i].Cells[1].Value;
                        cmd.Parameters["@LNAME"].Value = datagrdStatus_order.Rows[i].Cells[2].Value;
                        cmd.Parameters["@DESC_ORDER"].Value = datagrdStatus_order.Rows[i].Cells[3].Value;
                        cmd.Parameters["@ORDER_NUMBER"].Value = datagrdStatus_order.Rows[i].Cells[4].Value;
                        cmd.Parameters["@MODULES_NAME"].Value = datagrdStatus_order.Rows[i].Cells[5].Value;
                        cmd.Parameters["@PROJECT_NAME"].Value = datagrdStatus_order.Rows[i].Cells[6].Value;
                        cmd.Parameters["@AMOUNT_OF_PRODUCTS"].Value = datagrdStatus_order.Rows[i].Cells[7].Value;
                        cmd.Parameters["@BEGIN_DATE"].Value = datagrdStatus_order.Rows[i].Cells[8].Value;
                        cmd.Parameters["@END_DATE"].Value = datagrdStatus_order.Rows[i].Cells[9].Value;
                        cmd.ExecuteNonQuery();
                    }
                    con.Close();
                }
            }
            MessageBox.Show("Imported correctly");
            loaddataalldatagridview();

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2）在foreach循环中：

            string constring = "datasource = localhost; port = 3306; username = root; password = ";
            string query5 = "INSERT IGNORE INTO try1.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 try1.workers INNER JOIN try1.orders INNER JOIN try1.modules INNER JOIN try1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND workers.ID_WORKER = @ID_WORKER AND orders.DESC_ORDER = @DESC_ORDER AND orders.ORDER_NUMBER = @ORDER_NUMBER AND modules.NAME = @MODULES_NAME AND projects.PROJECT_NAME = @PROJECT_NAME";

            using (MySqlConnection con = new MySqlConnection(constring))
            {
                using (MySqlCommand cmd = new MySqlCommand(query5, con))
                {
                    cmd.Parameters.Add("@ID_WORKER", MySqlDbType.Int32);
                    cmd.Parameters.Add("@FNAME", MySqlDbType.VarChar);
                    cmd.Parameters.Add("@LNAME", MySqlDbType.VarChar);
                    cmd.Parameters.Add("@DESC_ORDER", MySqlDbType.VarChar);
                    cmd.Parameters.Add("@ORDER_NUMBER", MySqlDbType.VarChar);
                    cmd.Parameters.Add("@MODULES_NAME", MySqlDbType.VarChar);
                    cmd.Parameters.Add("@PROJECT_NAME", MySqlDbType.VarChar);
                    cmd.Parameters.Add("@AMOUNT_OF_PRODUCTS", MySqlDbType.Int32);
                    cmd.Parameters.Add("@BEGIN_DATE", MySqlDbType.DateTime);
                    cmd.Parameters.Add("@END_DATE", MySqlDbType.DateTime);
                    con.Open();

                    foreach (DataGridViewRow row in datagrdStatus_order.Rows)
                    {
                        cmd.Parameters.AddWithValue("@ID_WORKER", row.Cells["ID_WORKER"].Value);
                        cmd.Parameters.AddWithValue("@FNAME", row.Cells["FNAME"].Value);
                        cmd.Parameters.AddWithValue("@LNAME", row.Cells["LNAME"].Value);
                        cmd.Parameters.AddWithValue("@DESC_ORDER", row.Cells["DESC_ORDER"].Value);
                        cmd.Parameters.AddWithValue("@ORDER_NUMBER", row.Cells["ORDER_NUMBER"].Value);
                        cmd.Parameters.AddWithValue("@MODULES_NAME", row.Cells["NAME"].Value);
                        cmd.Parameters.AddWithValue("@PROJECT_NAME", row.Cells["PROJECT_NAME"].Value);
                        cmd.Parameters.AddWithValue("@AMOUNT_OF_PRODUCTS", row.Cells["AMOUNT_OF_PRODUCTS"].Value);
                        cmd.Parameters.AddWithValue("@BEGIN_DATE", row.Cells["BEGIN_DATE"].Value);
                        cmd.Parameters.AddWithValue("@END_DATE", row.Cells["END_DATE"].Value);
                        cmd.ExecuteNonQuery();
                    }
                    con.Close();
                }
            }
            MessageBox.Show("Imported correctly");
            loaddataalldatagridview();

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而且我仍然没有有效的答案。我发送了指向共享文件的链接以进行下载：https : //drive.google.com/file/d/1LE7phZwyT7VR3NJc6bA-n1reCJ_-X3u9/view?usp=sharing

也许有帮助。

Answer 1

Mat*_*int 5

在查看会影响性能的代码时，有两点对我很重要：

AddWithValue之所以昂贵，是因为它使用反射，有时它做错了事。而是使用其名称和数据类型添加参数，而不提供值。然后，根据需要提供值。

您正在为每一行连接和断开与数据库的连接。就网络资源而言，这是非常昂贵的。相反，您应该连接一次数据库，然后执行命令，然后关闭连接。您甚至可以重新使用该命令，只需更改每一行的参数即可。

using (MySqlConnection con ...)
{
    using (MySqlCommand cmd ...)
    {
        ... define the parameters and add them to the command, 
        ... without adding values to them yet

        con.Open();
        foreach (...)
        {
            ... now set values of the parameters for the row

            cmd.ExecuteNonQuery();
        }

        con.Close();
    }
}

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请注意，我故意没有提供完整的代码，因为其他Stack Overflow答案，外部网站和产品文档中已经提供了很多代码。我认为，如果您尝试一下，您应该就能完成难题。祝好运。

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