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);      }    }  }}