C#访问SQLServer增删改查代码实例

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;
using System.Data.SqlClient;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

//查询
private void button1_Click(object sender, EventArgs e)
{
string MyConn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;Trusted_Connection=no";//定义数据库连接参数
SqlConnection MyConnection = new SqlConnection(MyConn);//定义一个数据连接实例
SqlCommand MyCommand = new SqlCommand("SELECT * FROM 图书借阅", MyConnection); //定义一个数据库操作指令
SqlDataAdapter SelectAdapter = new SqlDataAdapter();//定义一个数据适配器
SelectAdapter.SelectCommand = MyCommand;//定义数据适配器的操作指令
DataSet MyDataSet = new DataSet();//定义一个数据集
MyConnection.Open();//打开数据库连接
SelectAdapter.SelectCommand.ExecuteNonQuery();//执行数据库查询指令
MyConnection.Close();//关闭数据库
SelectAdapter.Fill(MyDataSet);//填充数据集
DataGrid1.DataSource = MyDataSet.Tables[0];
//DataGrid1.DataBind();//将数据表格用数据集中的数据填充
}

//添加
private void button2_Click(object sender, EventArgs e)
{
string MyConn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;Trusted_Connection=no";
SqlConnection MyConnection = new SqlConnection(MyConn);
string MyInsert = "insert into 图书借阅 (图书编号,读者编号,续借次数) values ('" + Convert.ToString(textBox2.Text) + "','" +
Convert.ToString(textBox3.Text)+ "','"+Convert.ToInt32(textBox4.Text)+ "')";
SqlCommand MyCommand = new SqlCommand(MyInsert, MyConnection);
try//异常处理
{
MyConnection.Open();
MyCommand.ExecuteNonQuery();
MyConnection.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}

//更新
private void button3_Click(object sender, EventArgs e)
{
string MyConn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;Trusted_Connection=no";
SqlConnection MyConnection = new SqlConnection(MyConn);
string MyUpdate = "Update 图书借阅 set 操作员='" + textBox2.Text + "'" + " where 借阅编号=" + "'" + textBox1.Text + "'";
SqlCommand MyCommand = new SqlCommand(MyUpdate, MyConnection);
try
{
MyConnection.Open();
MyCommand.ExecuteNonQuery();
MyConnection.Close();
textBox1.Text = "";
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}

//删除
private void button4_Click(object sender, EventArgs e)
{
string MyConn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;Trusted_Connection=no";
SqlConnection MyConnection = new SqlConnection(MyConn);
string MyDelete = "Delete from 图书借阅 where 借阅编号=" + textBox1.Text;
SqlCommand MyCommand = new SqlCommand(MyDelete, MyConnection);
try
{
MyConnection.Open();
MyCommand.ExecuteNonQuery();
MyConnection.Close();
textBox1.Text = "";
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}