DataGirdView 增删改查（一）

新建一个DBconn类:

using System;

using System.Collections.Generic;

using System.Text;

using System.Data.SqlClient;

namespace test

{

public class DBConn

{

public static string connStr = ConfigurationManager.ConnectionStrings["supermarketConstring"].ToString();//首先获取连接数据库字符串 public static SqlConnection conn = new SqlConnection(connStr);

}

}

下面是窗体,有两个文本框,txtno,txtname,四个按钮增,删,改,查

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Data.SqlClient;

namespace test

{

public partial class Form2 : Form

{

public Form2()

{

InitializeComponent();

}

DataSet ds;

SqlDataAdapter ada;

string sql = null;

SqlCommand cmd;

//查询

private void btnSearch_Click(object sender, EventArgs e)

{

ShowView();

}

private void ShowView()

{

ds = new DataSet("myschool");

if (ds.Tables.Count > 0)

ds.Tables.Clear();

sql = "SELECT * FROM classinfo";

ada = new SqlDataAdapter(sql, DBConn.conn);

ada.Fill(ds);

this.dataGridView1.DataSource = ds.Tables[0];

}

//添加

private void btnAdd_Click(object sender, EventArgs e)

{

sql = string.Format("INSERT classInfo VALUES ({0},'{1}')", int.Parse(txtNo.Text), txtName.Text);

cmd = new SqlCommand(sql, DBConn.conn);

DBConn.conn.Open();

int count = cmd.ExecuteNonQuery();

if (count > 0)

{

MessageBox.Show("添加成功!");

}

else

{

MessageBox.Show("添加失败!");

}

DBConn.conn.Close();

ShowView();

}

//删除

private void btnDelete_Click(object sender, EventArgs e)

{

sql = string.Format("delete classinfo WHERE classno = {0}", int.Parse(txtNo.Text));

cmd = new SqlCommand(sql, DBConn.conn);

DBConn.conn.Open();

int count = cmd.ExecuteNonQuery();

if (count > 0)

{

MessageBox.Show("删除成功!");

}

else

{

MessageBox.Show("删除失败!");

}

DBConn.conn.Close();

ShowView();

}

//修改

private void btnUpdate_Click(object sender, EventArgs e)

{

SqlCommandBuilder bl = new SqlCommandBuilder(ada);

ada.Update(ds);

ShowView();

}

}

}