Question

我有一个与Access数据库（accdb）交互的C＃Windows窗体项目。我有一个表单可以很好地读取数据库，并将其显示在DataGridView中。我有另一种表单，可以将文本框信息提交到数据库中。

我有另一种表格（见下图），允许用户点击按钮（按钮1）打开CSV文件，使用“openFileDialog”，并在表格上的dataGridView中显示所选文件的内容（示例如下所示）。

我的目标：我希望在同一表单上有一个按钮（按钮3），将dataGridView的显示结果提交到前面提到的Access数据库中。

好像我拥有了我需要的所有组件。感觉我离我不太远，但我的代码中似乎仍然存在错误和/或缺失。几周以来，我一直在努力实现这一目标。请帮助!!!

以下是表单的屏幕截图和表单的完整代码。非常感谢所有帮助！

enter image description here

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Globalization;
using System.Configuration;
using System.Data.OleDb;

namespace csvToGrid
{
    public partial class Import : Form
        {
            public Import()
                {
                    InitializeComponent();
                }
        public void button1_Click(object sender, EventArgs e)
            {
                string delimiter = ",";
                string tablename = "medTable";
                DataSet dataset = new DataSet();
                OpenFileDialog openFileDialog1 = new OpenFileDialog();
                openFileDialog1.Filter = "CSV Files (*.csv)|*.csv|All Files (*.*)|*.*";
                openFileDialog1.FilterIndex = 1;
                if (openFileDialog1.ShowDialog() == DialogResult.OK)
                    {
                        if (MessageBox.Show("Are you sure you want to import the data from \n " + openFileDialog1.FileName + "?", "Are you sure?", MessageBoxButtons.YesNo) == DialogResult.Yes)
                            {
                                filename = openFileDialog1.FileName;
                                StreamReader sr = new StreamReader(filename);
                                string csv = File.ReadAllText(openFileDialog1.FileName);
                                dataset.Tables.Add(tablename);
                                dataset.Tables[tablename].Columns.Add("Prescription");
                                dataset.Tables[tablename].Columns.Add("Customer Name");
                                dataset.Tables[tablename].Columns.Add("Medication");
                                dataset.Tables[tablename].Columns.Add("Quantity");
                                dataset.Tables[tablename].Columns.Add("Date Filled");

                                string allData = sr.ReadToEnd();
                                string[] rows = allData.Split("\r".ToCharArray());

                                foreach (string r in rows)
                                    {
                                        string[] items = r.Split(delimiter.ToCharArray());
                                        dataset.Tables[tablename].Rows.Add(items);
                                    }
                                this.dataGridView1.DataSource = dataset.Tables[0].DefaultView;
                                MessageBox.Show(filename + " was successfully imported. \n Please review all data before sending it to the database.", "Success!", MessageBoxButtons.OK);
                            }
                        else
                            {
                                this.Close();
                            }
                }
            }

        public string filename { get; set; }


        private void openFileDialog1_FileOk(object sender, CancelEventArgs e)
            {

            }

        private void Import_Load(object sender, EventArgs e)
            {

            }

        private void button4_Click(object sender, EventArgs e)
        {
            Application.Exit();

        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void button3_Click(object sender, EventArgs e)

            //remove the semicolon, and add brackets below after line
            {   
                //create the connection string
                string connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Search\\Database.accdb";
                //create the database query
                string query = "SELECT * FROM script_Orders";
                //create an OleDbDataAdapter to execute the query
                OleDbDataAdapter dAdapter = new OleDbDataAdapter(query, connString);
                //create a command builder
                OleDbCommandBuilder cBuilder = new OleDbCommandBuilder(dAdapter);
                //create a DataTable to hold the query results
                DataTable dTable = new DataTable();
                //fill the DataTable
                dAdapter.Fill(dTable);
                //the DataGridView
                DataGridView dataGridView1 = new DataGridView();
                //BindingSource to sync DataTable and DataGridView
                BindingSource bSource = new BindingSource();
                //set the BindingSource DataSource
                bSource.DataSource = dTable;
                //set the DataGridView DataSource
                dataGridView1.DataSource = bSource;
                // An update function to get the changes back into the database.
                dAdapter.Update(dTable);
            }

        }
    }

enter image description here

欢迎举例！

Answer 1

当CSV文件在Access数据库外部时，使用数据集对象处理数据是一项挑战。要解决此问题，您可以以编程方式将更新从DataGridView持久保存到Access数据库。

插入示例

DataRow anyRow = DatasetName.ExistingTable.NewRow();
anyRow.FirstName = "Jay";
anyRow.LastName = "Stevens";
ExistingTable.Rows.Add(anyRow);

更新示例

dsCustomers1.Customers[4].CompanyName = "Wingtip Toys";
dsCustomers1.Customers[4].City = "Buffalo";

删除示例

dsCustomers1.Customers.Rows[0].Delete();

希望这会有所帮助。欢呼声。

Answer 2

您需要查看为数据适配器创建UPDATE命令。

下面的本指南将帮助您更好地了解数据适配器： -

http://msdn.microsoft.com/en-us/library/33y2221y.aspx

祝你好运!!

Answer 3

假设您要做的就是获取CSV的内容并将它们插入到表中，您可以循环访问数据集并调用insert命令（当然还有参数化查询）

var AccessCnn = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Persist Security Info=False;", @"C:\YOURDBNAME.accdb");

using (OleDbConnection accessCnn = new OleDbConnection(AccessCnn))
{


    //Create The Command
    var accessCmd = new OleDbCommand(@"INSERT INTO script_Orders  
                                       (Prescription, [Customer Name], Medication, Quantity, [Date Filled])
                                    VALUES (?,?,?,?,?)", accessCnn);

   foreach(var row in dataset.Tables["medTable"].Rows)
   {
      accessCmd.Parameters.Clear();

      accessCmd.Parameters.AddWithValue("?", row["Prescription"]);
      accessCmd.Parameters.AddWithValue("?", row["Customer Name"]);
      accessCmd.Parameters.AddWithValue("?", row["Medication"]);
      accessCmd.Parameters.AddWithValue("?", row["Quantity"]);
      accessCmd.Parameters.AddWithValue("?", row["Date Filled"]);

      ccessCmd.ExecuteNonQuery();
   }


}

您需要将DataSet移动为类级变量

public partial class Import : Form
{
     DataSet dataset;

然后在button1_Click中分配它而不是声明并分配它

string tablename = "medTable";
dataset = new DataSet();

使用C＃用CSV文件填充DataGridView，并使用结果更新Access数据库

3 个答案: