C# 实验4 数据库

时间:2021-03-21 02:09:07
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;
using System.Data.SqlClient; 
namespace shiyan4
{
public partial class Form1 : Form
{
SqlDataAdapter adapter;
DataTable table;
public Form1()
{
InitializeComponent();
} private void button1_Click(object sender, EventArgs e)
{
string varNumber = textBox1.Text.Trim();
if (varNumber ==""||varNumber ==null){MessageBox.Show("请输入你要查询的学号", "提示信息",MessageBoxButtons.OK,MessageBoxIcon.Warning);}
try
{string connStr = "Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\Database1.mdf;Integrated Security=True;User Instance=True";
SqlConnection conn = new SqlConnection(connStr);
string sql = "select * from Table1 where 姓名='" + varNumber + "'";
adapter = new SqlDataAdapter(sql, conn);
SqlCommandBuilder builder = new SqlCommandBuilder(adapter); table = new DataTable();
adapter.Fill(table);
dataGridView1.DataSource = table;
//conn.Close();
}
catch (Exception ee)
{
MessageBox.Show(ee.Message, "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
} private void button2_Click(object sender, EventArgs e)
{
textBox1.Text = "";
dataGridView1.EndEdit();
try
{
adapter.Update(table);
MessageBox.Show("保存成功");
}
catch (Exception ee)
{
MessageBox.Show(ee.Message, "保存失败");
} } private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{ }
}
}