ADO.NET例子

Form1.cs

using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;

namespace SqlWithAdo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// Add
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            string connectionString = ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString;
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                string sql = "";
                sql = "insert into Student(Name,Age,Gentle) values('趙五',18,'男')";
                using (SqlCommand cmd = new SqlCommand(sql, conn))
                {
                    cmd.ExecuteNonQuery();
                }
                conn.Close();
                conn.Dispose();
                MessageBox.Show(@"已添加趙五");
            }
        }
        /// <summary>
        /// Update
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            string connectionString = ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString;
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                string sql = "update Student set Name = '張張22' where id=2";
                using (SqlCommand cmd = new SqlCommand(sql, conn))
                {
                    cmd.ExecuteNonQuery();
                }
                conn.Close();
                conn.Dispose();
                MessageBox.Show(@"已修改id值爲2的姓名");
            }
        }
        /// <summary>
        /// Delete
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            string connectionString = ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString;
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                string sql = "delete from Student where id =3";
                using (SqlCommand cmd = new SqlCommand(sql, conn))
                {
                    cmd.ExecuteNonQuery();
                }
                conn.Close();
                conn.Dispose();
                MessageBox.Show(@"已刪除id值爲3的數據");
            }
        }
        /// <summary>
        /// select
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button4_Click(object sender, EventArgs e)
        {
            string connectionString = ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString;
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                string sql = "";
                sql = "select * from Student where Id = 1";
                SqlDataAdapter adapter = new SqlDataAdapter(sql, conn);
                DataTable table = new DataTable();
                adapter.Fill(table);
                if (table.Rows.Count > 0)
                {
                    MessageBox.Show(table.Rows[0]["Name"].ToString());
                }
                conn.Close();
                conn.Dispose();
            }
        }
    }
}

App.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <connectionStrings>
    <add name="MyConnectionString" connectionString="data source=HANXINHUI\SQLEXPRESS;initial catalog=TextBase;integrated security=True;" providerName="System.Data.SqlClient"/>
  </connectionStrings>
</configuration>