Cwindow窗体实现数据库连接

1、C#程序进行数据库连接，以及数据库的更新，插入，修改，查询等维护功能。步骤：1：创建windows窗体应用程序如下图放置所需要的控件：添加1个tabpage1控件，1个Lable控件，6个Button控件，2个textbox控件再按下列表格设置各控件的属性更改他们的名字；3:程序运行结果图;1：数据库连接：2：查询数据：成绩表：3：删除数据：删除前成绩表：删除后成绩表：4：插入数据：插入前成绩表：5：更新数据库：更新前成绩表：4:程序源代码using System;using System.Collections.Generic;using System.ComponentModel;usin

2、g System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Data.SqlClient;namespace DataBase public partial class Form1 : Form public Form1() InitializeComponent(); private void Form1_Load(object sender, EventArgs e) comboBox1.Items.Add("SELECT 姓名,语文 FROM 成绩表 W

3、HERE 学号= 001"); comboBox1.Items.Add("DELETE FROM 成绩表 WHERE 数学 = 115"); comboBox1.Items.Add("INSERT INTO 成绩表(姓名,学号,语文,数学,英语) VALUES(姓名,学号,语文,数学,英语)"); comboBox1.Items.Add("Update 成绩表 Set 语文= 131 WHERE 学号 =002"); private void button1_Click(object sender, EventArgs e)

4、 string connectonString = "Integrated Security=SSPI;Persist Security Info=False; Initial Catalog=sql;Data Source=I-PC;" connection = new SqlConnection(connectonString); connection.Open(); if (connection.State = ConnectionState.Open) textBox2.Text = "数据库连接成功，SqlConnection信息如下：" +

5、"rn" + " 连接状态： " + connection.State + "rn" + " SQL Server实例的名称： " + connection.DataSource + "rn" + " 数据库名称： " + connection.Database + "rn" + " SQL Server 版本： " + connection.ServerVersion + "rn" + " 数据库客户端I

6、d： " + connection.WorkstationId + "rn" + " 终止尝试并生成错误之前所等待的时间： " + connection.ConnectionTimeout + " 秒" + "rn" + " 网络数据包大小： " + connection.PacketSize + " 字节" + "rn" private void button2_Click_1(object sender, EventArgs e) textB

7、ox2.Text = null; String commandTextQuery = comboBox1.Text; / String commandTextQuery = "SELECT * FROM Region where RegionID="zhangsan""+textBox1.Text; /创建SqlCommand命令 SqlCommand cmdQuery = new SqlCommand(commandTextQuery, connection); /执行SqlCommand命令并返回结果 cmdQuery.Parameters.AddW

8、ithValue("001", textBox3.Text); SqlDataReader reader = cmdQuery.ExecuteReader(); textBox2.Text = "学号为001的学生的姓名和语文分数是：" + "rn" textBox2.Text = "姓名 tt 语文" + "rn" /Console.WriteLine("性别为女的客户的客户编号和姓名是："); / Console.WriteLine("客户编号 t 姓名&quo

9、t;); /通过循环列表显示查询结果集 while (reader.Read() string rowInfo = reader0 + "t" + reader1 + "rn" textBox2.Text = textBox2.Text + rowInfo; /Console.WriteLine(" 0 tt 1", reader0, reader1); /关闭查询结果集 reader.Close(); /Console.ReadLine(); private void button5_Click_1(object sender, E

10、ventArgs e) textBox2.Text = null; String commandTextDelete = comboBox1.Text; / 创建SqlCommand命令 SqlCommand cmdDelete = new SqlCommand(commandTextDelete, connection); cmdDelete.Parameters.AddWithValue("115", textBox3.Text); /执行SqlCommand命令并检查结果 int result = cmdDelete.ExecuteNonQuery(); if (re

11、sult = 1) textBox2.Text = "删除记录操作成功." /Console.WriteLine("删除记录操作成功."); else textBox2.Text = "删除记录操作失败." / Console.WriteLine("删除记录操作失败."); private void button3_Click_1(object sender, EventArgs e) textBox2.Text = null; String commandTextInsert = comboBox1.Text;

12、SqlCommand cmdInsert = new SqlCommand(commandTextInsert, connection); cmdInsert.Parameters.AddWithValue("姓名", "周七"); cmdInsert.Parameters.AddWithValue("学号", 005); cmdInsert.Parameters.AddWithValue("语文", 105); cmdInsert.Parameters.AddWithValue("数学", 1

13、15); cmdInsert.Parameters.AddWithValue("英语", 124); / 执行SqlCommand命令并检查结果 int result = cmdInsert.ExecuteNonQuery(); if (result = 1) textBox2.Text = "插入记录操作成功." /Console.WriteLine("插入记录操作成功."); else textBox2.Text = "插入记录操作失败." / Console.WriteLine("插入记录操作失败.

14、"); private void button4_Click_1(object sender, EventArgs e) textBox2.Text = null; String connectonString = "Server=.SQLEXPRESS;Integrated Security=SSPI;Persist Security Info=False; Initial Catalog=sql;Data Source=I-PC;" / String connectonString = "Server=.SQLEXPRESS;DataBase=C:N

15、ORTHWND.MDF; Integrated Security = SSPI;" / String connectonString = "Data Source = .SQLEXPRESS; Initial Catalog= c:NORTHWND.MDF; Integrated Security = True;", System.Data.SqlClient.SqlConnection connection1= new SqlConnection(connectonString); connection1.Open(); /String commandTextU

16、pdate = "Update Region Set RegionDescription = name WHERE RegionID = id" / 创建SqlCommand命令 SqlCommand cmdUpdate = new SqlCommand("Update 成绩表 Set 语文=语文 WHERE 学号 =学号", connection1); cmdUpdate.Parameters.AddWithValue("学号",002); cmdUpdate.Parameters.AddWithValue("语文&quo

17、t;,131); / 执行SqlCommand命令并检查结果 int result = cmdUpdate.ExecuteNonQuery(); if (result = 1) textBox2.Text = "更新记录操作成功." /Console.WriteLine("更新记录操作成功."); else textBox2.Text = "更新记录操作失败." /Console.WriteLine("更新记录操作失败."); private void button6_Click_1(object sender,

18、EventArgs e) SqlCommand cmdQuery = new SqlCommand("Ten Most Expensive Products", connection); cmdQuery.CommandType = CommandType.StoredProcedure; / 执行SqlCommand命令并返回结果 SqlDataReader reader = cmdQuery.ExecuteReader(); textBox2.Text = "Products表中最贵的10个商品的信息：" + "rn" textBox2.Text = " 产品名称 ttt单价" + "rn" /Console.WriteLine("Products表中最贵的10个商品的信息："); / Console.WriteLine(" 产品名称 ttt单价"); / 通过循环列表显示查询结果集 while (reader.Read() string rowInfo = reader0.ToString().PadRight(30) + "t" + reader1 + "rn