问题描述

有什么简单的方法可以将列表框中的项目保存到数据库中.我正在使用 Windows 窗体的访问数据库，用户从组合框中选择项目并将其添加到列表框中.

Is there any easy way to save the items in listbox to the database. I am using access database for windows form where user selects items from the combobox and adds it to the list box.

现在我想将列表框中的所有项目添加到用逗号分隔的数据库中.我该怎么做?

Now i want to add all the items in the listbox to the database separated with comma. How can i perform this?

这是类的代码

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 System.Data.OleDb;

namespace Purchase_Management
{
    public partial class Form1 : Form
    {

        string connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Amrit\Desktop\Database.accdb ;Persist Security Info=False;";
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            comboBox1.SelectedText = "Mr";
            comboBox1.Items.Add("Mr");
            comboBox1.Items.Add("Mrs");
            comboBox1.Items.Add("Miss");
            DataSet ds = GetAllItems();
            comboBox2.DataSource = ds.Tables[0];
            comboBox2.DisplayMember = "Product Name";


        }

        public DataSet GetAllItems()
        {
            DataSet dataSet = new DataSet();
            // Create connection object
            OleDbConnection oleConn = new OleDbConnection(connString);
            try
            {
                oleConn.Open();
                string sql = "SELECT [Product Name] FROM [Product]";
                OleDbDataAdapter dataAdapter = new OleDbDataAdapter(sql, oleConn);
                dataAdapter.Fill(dataSet, "Product");
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
            finally
            {
                oleConn.Close();
            }
            if (dataSet.Tables.Count <= 0)
                return null;
            else
                return dataSet;
        }


        public string InsertUser(string custName, string title, string cust, string phoneNumber, string address1, string address2, string city, string postCode, string country, string itemPurchased)
        {

            // Create connection object
            int ix = 0;
            string rTurn = "";
            OleDbConnection oleConn = new OleDbConnection(connString);
            try
            {
                oleConn.Open();
                string sql = "INSERT INTO [Customer]([Customer's Ebayname], [Title],  [Customer's Name], [Phone Number], [Address 1], [Address 2], [City], [Post Code], [Country] , [Item Purchased])" +
                         "VALUES ( @custName, @title, @cust, @phoneNumber, @address1, @address2, @city, @postCode, @country , @itemPurchased)";
                OleDbCommand oleComm = new OleDbCommand(sql, oleConn);

                oleComm.Parameters.Add("@custName", OleDbType.Char).Value = custName;
                oleComm.Parameters.Add("@title", OleDbType.Char).Value = title;
                oleComm.Parameters.Add("@cust", OleDbType.Char).Value = cust;
                oleComm.Parameters.Add("@phoneNumber", OleDbType.Char).Value = phoneNumber;
                oleComm.Parameters.Add("@address1", OleDbType.Char).Value = address1;
                oleComm.Parameters.Add("@address2", OleDbType.Char).Value = address2;
                oleComm.Parameters.Add("@city", OleDbType.Char).Value = city;
                oleComm.Parameters.Add("@postCode", OleDbType.Char).Value = postCode;
                oleComm.Parameters.Add("@country", OleDbType.Char).Value = country;
                oleComm.Parameters.Add("@itemPurchased", OleDbType.Char).Value = itemPurchased;


                ix = oleComm.ExecuteNonQuery();
                if (ix > 0)
                    rTurn = "User Added";
                else
                    rTurn = "Insert Failed";
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
                rTurn = ex.ToString();
            }
            finally
            {
                oleConn.Close();
            }
            return rTurn;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            InsertUser(textBox1.Text, comboBox1.Text, textBox2.Text, textBox3.Text, textBox4.Text, textBox5.Text, textBox6.Text, textBox7.Text, textBox8.Text, comboBox2.Text);
            if (MessageBox.Show("Customer Details Saved Successfuly") == DialogResult.OK)
            {
                Form1.ActiveForm.Close();


            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            listBox1.Items.Add(comboBox2.Text);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (this.listBox1.SelectedIndex >= 0)
                this.listBox1.Items.RemoveAt(this.listBox1.SelectedIndex);
        }



    }
}

推荐答案

第一步

连接 ListBox 中的所有项目.String.Join 接受一个字符串数组值，并返回将它们连接在一起的单个字符串.考虑使用 ListBox.Items 属性其中包含您添加的所有项目.

Concatenate all the items in your ListBox. String.Join takes an array of string values, and returns a single String which concatenates them together. Consider using the ListBox.Items property which contains all the items you've added.

第 2 步

在您想要的任何数据库中插入字符串.如果您在 Product 表中重复使用itemPurchased"列，您将能够使用您在上面第 1 步中连接的字符串.

Insert the string in whichever database you want. If you're reusing the "itemPurchased" column in your Product table you'll be able to use the string you've concatenated from Step 1 above.

没有为你编写完整的代码，我不确定我们还能为你做些什么.

Short of writing the entire code for you, I'm not sure what else we can do for you here.

这篇关于将多个列表框项目添加到数据库的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！