C#之MySql新增

1.新建一個項目，windows窗體應用程序

2.創建一張User表,包括字段有：編號、用戶名、密碼

插入一條數據

3.新建一個UserForm窗體,格式如下

4.新建一個類庫（SqlHelper）

對常用操作進行封裝，這樣會減少工作量和代碼量（別忘了添加引用，這裏是mysql.data）

using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;

namespace SqlHelper
{
    public static class helper
    {
      public static string conStr = "Server=localhost;user=root;password=admin;database=test";
        public static DataTable GetList(string sql) 
        {
            using (MySqlConnection myCon = new MySqlConnection(conStr)) 
            {
                MySqlDataAdapter adapter = new MySqlDataAdapter(sql, myCon);
                DataTable table = new DataTable();
                adapter.Fill(table);
                return table;
            }
        }
        public static int Insert(string sql, params MySqlParameter[] ps) 
        {
            using (MySqlConnection myCon = new MySqlConnection(conStr))
            {
                MySqlCommand cmd = new MySqlCommand(sql, myCon);
                cmd.Parameters.AddRange(ps);
                myCon.Open();
                return cmd.ExecuteNonQuery();
            }
        }
    }
}

5.窗體加載是顯示數據，在右側填寫完數據後，點擊【添加】按鈕，將會新增一條數據，並刷新列表。

using MySql.Data.MySqlClient;
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;

namespace WindowsFormsApplication1
{
    public partial class UserForm : Form
    {
        public UserForm()
        {
            InitializeComponent();
        }
        private void UserForm_Load(object sender, EventArgs e)
        {
            LoadUser();
        }
        //刷新
        private void LoadUser() {
            string sql = "select * from user";
            DataTable dt = SqlHelper.helper.GetList(sql);
            List<User> UserList = new List<User>();
            foreach (DataRow row in dt.Rows)
            {
                UserList.Add(new User()
                {
                    user_no = Convert.ToInt32(row["user_no"]),
                    user_name = Convert.ToString(row["user_name"]),
                    user_pwd = Convert.ToString(row["user_pwd"]),
                    type = Convert.ToInt32(row["type"])
                });

            }
            dataGridView1.DataSource = UserList;
        }
        //格式化
        private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            if (e.ColumnIndex == 3) {
                switch (e.Value.ToString()) { 
                    case "0":
                        e.Value="經理";
                        break;
                    case"1":
                        e.Value = "員工";
                        break;
                }
            }
            else if (e.ColumnIndex == 2) {
                e.Value = "******";
            }

        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            User user = new User()
            {
                user_name = tbUserName.Text,
                user_pwd = tbUserPwd.Text,
                type = rbClerk.Checked ? 1 : 0
            };

            if (AddUser(user))
            {
                LoadUser();
                MessageBox.Show("新增成功");
            }
            else {
                MessageBox.Show("新增失敗，請重新嘗試");
            }

            this.tbUserName.Text = this.tbUserPwd.Text = string.Empty;
            this.rbClerk.Checked = this.rbManager.Checked = false;
        }
        //新增用戶
        private bool AddUser(User u) 
        {
            string sql = "insert into user (user_name,user_pwd,type) values(@user_name,@user_pwd,@type)";
            MySqlParameter[] ps ={
                                 new MySqlParameter("@user_name",u.user_name),
                                 new MySqlParameter("@user_pwd",u.user_pwd),
                                 new MySqlParameter("@type",u.type)

                                };
            return SqlHelper.helper.Insert(sql, ps) > 0;


        }
        //清除操作
        private void btnClear_Click(object sender, EventArgs e)
        {
            this.tbUserName.Text = this.tbUserPwd.Text = string.Empty;
            this.rbClerk.Checked = false;
            this.rbManager.Checked = false;
        }
    }
}

6.效果