图书管理.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class 图书管理 : Form
    {
        public 图书管理()
        {
            InitializeComponent();

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }
        public void table()
        {
            dataGridView1.Rows.Clear();
            Dao dao = new Dao();
            string sql = "select * from t_book";
            IDataReader dc = dao.read(sql);
            while (dc.Read())
            {
                dataGridView1.Rows.Add(dc[0].ToString(), dc[1].ToString(), dc[2].ToString(), dc[3].ToString(), dc[4].ToString());

            }
            dc.Close();
            dao.Daoclose();
        }



        private void button3_Click(object sender, EventArgs e)
        {
            try
            {
                string id = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
                label2.Text = id + dataGridView1.SelectedRows[0].Cells[1].Value.ToString();
                DialogResult dr = MessageBox.Show("确认删除吗？", "信息提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
                if (dr == DialogResult.OK)
                {
                    string sql = $"delete from t_book where id='{id}'";
                    Dao dao = new Dao();
                    if (dao.Execute(sql) > 0)
                    {
                        MessageBox.Show("删除成功");
                        table();
                    }
                    else
                    {
                        MessageBox.Show("删除失败" + sql);