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();
    }

    //查詢
    private void button1_Click(object sender, EventArgs e)
    {
      string MyConn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;Trusted_Connection=no";//定義數據庫連接參數
      SqlConnection MyConnection = new SqlConnection(MyConn);//定義一個數據連接實例
      SqlCommand MyCommand = new SqlCommand("SELECT * FROM 圖書借閱", MyConnection); //定義一個數據庫操作指令
      SqlDataAdapter SelectAdapter = new SqlDataAdapter();//定義一個數據適配器
      SelectAdapter.SelectCommand = MyCommand;//定義數據適配器的操作指令
      DataSet MyDataSet = new DataSet();//定義一個數據集
      MyConnection.Open();//打開數據庫連接
      SelectAdapter.SelectCommand.ExecuteNonQuery();//執(zhí)行數據庫查詢指令
      MyConnection.Close();//關閉數據庫
      SelectAdapter.Fill(MyDataSet);//填充數據集
      DataGrid1.DataSource = MyDataSet.Tables[0];
      //DataGrid1.DataBind();//將數據表格用數據集中的數據填充
    }

    //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 圖書借閱 (圖書編號,讀者編號,續(xù)借次數) values ('" + Convert.ToString(textBox2.Text) + "','" +
        Convert.ToString(textBox3.Text)+ "','"+Convert.ToInt32(textBox4.Text)+ "')";
      SqlCommand MyCommand = new SqlCommand(MyInsert, MyConnection);
      try//異常處理
      {
        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 圖書借閱 set 操作員='" + textBox2.Text + "'" + " where 借閱編號=" + "'" + textBox1.Text + "'";
      SqlCommand MyCommand = new SqlCommand(MyUpdate, MyConnection);
      try
      {
        MyConnection.Open();
        MyCommand.ExecuteNonQuery();
        MyConnection.Close();
        textBox1.Text = "";
      }
      catch (Exception ex)
      {
        MessageBox.Show(ex.Message);
      }
    }

    //刪除
    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 圖書借閱 where 借閱編號=" + textBox1.Text;
      SqlCommand MyCommand = new SqlCommand(MyDelete, MyConnection);
      try
      {
        MyConnection.Open();
        MyCommand.ExecuteNonQuery();
        MyConnection.Close();
        textBox1.Text = "";
      }
      catch (Exception ex)
      {
        MessageBox.Show(ex.Message);
      }
    }
  }
}