Form1.cs

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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;
using System.IO;
namespace 图书管理系统
{
    public partial class Form1 : Form
    {
        public SqlConnection scn;
        public string connectionstring = "server=.\\sql2005;database=BookMis;uid=sa;pwd=sa";
        public SqlCommand cmd;
        public DataSet ds;
        public SqlDataAdapter sda;
        //构造函数
        public Form1()
        {
            InitializeComponent();
            scn = new SqlConnection(connectionstring);
            try
            {
                scn.Open();
            }
            catch (Exception ex)
            {
                MessageBox.Show("数据库连接失败！");
            }
            cmd = scn.CreateCommand();
            ds = new DataSet();
            sda = new SqlDataAdapter();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //pictureBox1.Image = new Bitmap("pic.jpg");
            
        }
        //查询所有书籍
        private void btnAll_Click(object sender, EventArgs e)
        {
            ds.Clear();
            cmd.CommandText = "select * from BookInfo ";
            sda.SelectCommand = cmd;
            sda.Fill(ds);
            dgvBook.DataSource = ds.Tables[0];
        }
        #region 选择查询
        private void btnSelect_Click(object sender, EventArgs e)
        {
            ds.Clear();
            string str = null;
            string query = "select * from BookInfo where ";
            if (cb1.Checked)
            {
                str = "书名" +" like '%" + tbName.Text + "%'";
            }