Question

我一直关注此处的文档：

http://msdn.microsoft.com/en-us/library/0f92s97z%28v=vs.100%29.aspx

但是，我无法让我的申请工作！

请参阅我的简短视频： https://www.youtube.com/watch?v=zpOCaT6NaGs

我的应用程序无法正常工作，我正在做恶梦，试图让它正常运行。

我想制作一个股票管理系统＆＃39;

要求：

浏览产品（名称，价格）
将产品添加到表中
编辑现有产品
删除现有产品
保存对表的更改
创建一个订单表单，该表单允许列出所选产品并提供所选数量并显示成本
打印结果。

我似乎无法将数据保存到数据库表而没有问题。

我的系统：

Windows 7 - SP1 Visual Studio 2010 Professional 使用Microsoft Access数据库（DataSet） 1表连接 3个字段：＆＃34; ID，proName，proPrice＆＃34;

非常欢迎任何帮助，谢谢。

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.Windows.Forms;
using System.Data.OleDb;

namespace KanadaStockControl
{
    public partial class frmProducts : Form
    {
        stockDataSet dsoc;
        OleDbConnection conn;
        OleDbDataAdapter da;

        public frmProducts()
        {
            InitializeComponent();
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            ////Adding the items to the database
            //dboKanadaDataSetProducts.ProductsRow newProductsRow;
            //newProductsRow = dboKanadaDataSetProducts.Products.NewProductsRow();
            ////Setting the Product Name
            //newProductsRow.ProductName = txtItem.Text;
            ////Setting the Product Price
            //newProductsRow.ListPrice = txtPrice.Text;
            ////Adding the new row to the table
            //this.dboKanadaDataSetProducts.Products.Rows.Add(newProductsRow);
            ////Saving the new row to the database
            //this.productsTableAdapter.Update(this.dboKanadaDataSetProducts.Products);            
            //Old NON WORKING DATABASE ADD CODE:
            //dboKanadaDataSetProductsTableAdapters.ProductsTableAdapter productsTableAdapter = new dboKanadaDataSetProductsTableAdapters.ProductsTableAdapter();
            //productsTableAdapter.Insert("9", "NA", "0", txtPrice.Text, "Software");

            //lstPrice.Items.Add(txtPrice.Text);
            //lstItem.Items.Add(txtItem.Text);
            stockDataSetTableAdapters.stockTableAdapter stockTableAdaptor = new stockDataSetTableAdapters.stockTableAdapter();
            stockTableAdapter.Insert(txtItem.Text, txtPrice.Text);
        }

        //private void lstItem_SelectedIndexChanged(object sender, EventArgs e)
        //{
        //    int x = lstItem.SelectedIndex;
        //    lstPrice.SelectedIndices.Add(x);
        //}

        //private void lstPrice_SelectedIndexChanged(object sender, EventArgs e)
        //{
        //    int x = lstPrice.SelectedIndex;
        //    lstItem.SelectedIndices.Add(x);
        //}

        private void btnRemove_Click(object sender, EventArgs e)
        {
            if(1==1/*lstItem.SelectedItem == null*/)
            {
                MessageBox.Show("You must select an Item first, Before you are able to delete it!");
            }
            else
            {


                //Finding the row to delete in the database
                //dboKanadaDataSetProducts.ProductsRow delProductsRow;
                //delProductsRow = dboKanadaDataSetProducts.Products.FindByProductsID(string ProductName);

                //START -------
                // Locate the row to delete.
                //NorthwindDataSet.RegionRow oldRegionRow;
                //oldRegionRow = northwindDataSet.Region.FindByRegionID(5);

                // Delete the row from the dataset
                //oldRegionRow.Delete();

                // Delete the row from the database 
                //this.regionTableAdapter.Update(this.northwindDataSet.Region);
                //END -------

                //lstPrice.Items.Remove(lstPrice.SelectedItem);
                //lstItem.Items.Remove(lstItem.SelectedItem);
            }
        }
//I cannot be bothered to add spaces to this code, hence the misaligned code.
    private void btnClear_Click(object sender, EventArgs e)
    {
        //lstItem.Items.Clear();
        //lstPrice.Items.Clear();
    }

    private void txtPrice_TextChanged(object sender, EventArgs e)
    {
        //string context = this.txtPrice.Text;
        //for (int i = 0; i < context.Length; i++)
        //{
        //    if (!char.IsNumber(context[i]))
        //    {
        //        MessageBox.Show("Only numbers are allowed in this field!");
        //        txtPrice.Text = txtPrice.Text.Remove(txtPrice.TextLength - 1);
        //    }
        //}
    }

    private void button2_Click(object sender, EventArgs e)
    {
        /*
        if (MessageBox.Show("Are you sure that you want to DELETE ALL LISTED ITEMS?", "WARNING: Delete All Records",
     MessageBoxButtons.YesNo, MessageBoxIcon.Warning)
     == DialogResult.Yes)
        {
            int j = lstPrice.Items.Count;
            for (int i = lstItem.Items.Count; i > 0; )
            {

                lstItem.Items.Remove(lstItem.Items[--i]);
                lstPrice.Items.Remove(lstPrice.Items[--j]);
            }
        }*/
    }

    private void button1_Click(object sender, EventArgs e)
    {
        this.Hide();
        frmOrder makeOrder = new frmOrder();
        makeOrder.Show();
    }

    //private void frmProducts_Load(object sender, EventArgs e)
    //{
    //    // TODO: This line of code loads data into the 'dboKanadaDataSetProducts.Products' table. You can move, or remove it, as needed.
    //    //this.productsTableAdapter.Fill(this.dboKanadaDataSetProducts.Products);

    //}

    private void frmProducts_Load_1(object sender, EventArgs e)
    {
        // TODO: This line of code loads data into the 'stockDataSet.stock' table. You can move, or remove it, as needed.
        //this.stockTableAdapter.Fill(this.stockDataSet.stock);
        dsoc = new stockDataSet();
        conn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\stock.accdb");
        da = new OleDbDataAdapter("Select * from stock", conn);
        OleDbCommandBuilder cmdBl = new OleDbCommandBuilder(da);
        da.Fill(dsoc, "stock");
        dataGridView2.DataSource = dsoc;
        dataGridView2.DataMember = "stock";
    }


    private void btnSave_Click(object sender, EventArgs e)
    {
        try
        {
            //this.Validate();
            //this.stockBindingSource.EndEdit();
            //this.stockTableAdapter.Update(this.stockDataSet.stock);
            //MessageBox.Show("Update successful");
            //da.Update(stockDataSet.Tables["stock"]);

            System.Data.OleDb.OleDbConnection oledb1 = new System.Data.OleDb.OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\stock.accdb");
            System.Data.OleDb.OleDbCommand cmd = new System.Data.OleDb.OleDbCommand();
            cmd.CommandType = System.Data.CommandType.Text;
            cmd.CommandText = "INSERT stock (proName, proPrice) VALUES ("+ txtItem.Text +", " + txtPrice.Text + ")";
            cmd.Connection = oledb1;

            oledb1.Open();
            cmd.ExecuteNonQuery();
            oledb1.Close();

        }
        catch (System.Exception ex)
        {
            MessageBox.Show("Update failed");
        }



        //this.dataGridView1.EndEdit();
    }

    private void btnMenu_Click(object sender, EventArgs e)
    {
        this.Hide();
        frmMenu showMenu = new frmMenu();
        showMenu.Show();
    }
}
}

Answer 1

cmd.CommandText =“INSERT INTO stock（proName，proPrice）VALUES（”+ txtItem.Text +“，”+ txtPrice.Text +“）”;

Answer 2

它会起作用。但数据将保存为bin/debug文件夹中的数据库副本。

转到解决方案资源管理器并更改数据库的属性。设置"Copy to output Directory=Copy if newer"，然后尝试。祝你好运。

将数据保存到数据库（单表）C＃

2 个答案: