C#实现图书管理系统

create  database MyLibrary 
 on  
 (name=Mylibrary_data1, 
  filename='d:\Mylibrary_data1.mdf',
  size=10,
   maxsize=50, filegrowth=4)
log on 
 (name=Mylibrary_log1,  
 filename='d:\Mylibrary_log1.ldf',
   size=10MB,
   maxsize=20MB, 
   filegrowth=2MB) 
use MyLibrary;
create table reader(
readerid varchar(20) primary key,
readername varchar(20) not null,
readersex varchar(20) not null,
readertype varchar(20) not null,
readerpd varchar(20) not null
)
create table book(
bookid varchar(20) primary key,
booktype varchar(20) not null,
bookauthor varchar(20) not null,
bookname varchar(20) not null,
isbrrowed varchar(20) not null,
booklibrary varchar(20) not null,
bookpubdate datetime
)
create table brrow_data(
readerid varchar(20) primary key,
bookid varchar(20) ,
bookname varchar(20),
brrowdate datetime
foreign key (readerid) references reader(readerid),
foreign key (bookid) references book(bookid)
)
create table return_record(
readerid varchar (20) primary key,
bookid varchar(20),
bookname varchar(20),
returndate datetime,
foreign key (readerid) references reader(readerid),
foreign key (bookid) references book(bookid)
)
create table readerfee(
readerid varchar(20) primary key,
bookid varchar(20),
bookname varchar(20),
readerpay varchar(20),
foreign key (readerid) references reader(readerid),
foreign key (bookid) references book(bookid)
)
--已有图书插如表中
insert into book (bookid,bookname,booktype,bookauthor,booklibrary,bookpubdate,isbrrowed) values ('3140921000','缥缈之旅','修真','小猪','仙王出版社','2005-09-01','否');
insert into book (bookid,bookname,booktype,bookauthor,booklibrary,bookpubdate,isbrrowed) values ('3140921001','唐朝好男人','穿越','多一半','新星出版社','2005-07-01','否');
insert into book (bookid,bookname,booktype,bookauthor,booklibrary,bookpubdate,isbrrowed) values ('3140921002','鬼吹灯','恐怖','天下霸唱','安徽文艺出版社','2005-09-01','否');
insert into book (bookid,bookname,booktype,bookauthor,booklibrary,bookpubdate,isbrrowed) values ('3140921003','和空姐同居的日子','都市','海王','中国海关出版社','2005-08-01','否');
insert into book (bookid,bookname,booktype,bookauthor,booklibrary,bookpubdate,isbrrowed) values ('3140921004','卡图','科幻','方向','广西人民出版社','2005-06-01','否');
insert into book (bookid,bookname,booktype,bookauthor,booklibrary,bookpubdate,isbrrowed) values ('3140921005','蜀山剑侠传','仙侠','还珠楼主','陕西人民出版社','2005-04-01','否');
insert into book (bookid,bookname,booktype,bookauthor,booklibrary,bookpubdate,isbrrowed) values ('3140921006','何以笙箫默','言情','顾漫','朝华出版社','2005-05-01','否');
insert into book (bookid,bookname,booktype,bookauthor,booklibrary,bookpubdate,isbrrowed) values ('3140921007','步步惊心','穿越','童话','民族出版社','2005-12-01','否');
--将读者插如表中
insert into reader(readerid,readername,readersex,readertype,readerpd) values ('21007000','李磊','男','学生','000000');
insert into reader(readerid,readername,readersex,readertype,readerpd) values ('21007001','棠张僧','男','学生','000000');
insert into reader(readerid,readername,readersex,readertype,readerpd) values ('21007002','韩梅梅','女','学生','000000');
insert into reader(readerid,readername,readersex,readertype,readerpd) values ('21007003','路西','女','学生','000000');
insert into reader(readerid,readername,readersex,readertype,readerpd) values ('21007004','王强','男','学生','000000');
insert into reader(readerid,readername,readersex,readertype,readerpd) values ('21007005','马正标','男','管理','000000');
insert into reader(readerid,readername,readersex,readertype,readerpd) values ('21007006','卢海鹏','男','管理','000000');
insert into reader(readerid,readername,readersex,readertype,readerpd) values ('21007007','李艳玲','女','管理','000000');
--查询功能
select *from reader;
select *from book;
select *from brrow_data;
select *from return_record;
select *from readerfee;
--删除表
drop table reader;
drop table book;
drop table brrow_data;
drop table return_record;
drop table readerfee;

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;
using System.Data.SqlClient;

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

        private void panel1_Paint(object sender, PaintEventArgs e)
        {

        }
        //登录按钮
        private void button1_Click(object sender, EventArgs e)
        {
            Form2 form2 = new Form2();
            this.Hide();
            form2.Show();
            mycon.Close();
            //sql = string.Format("select count(*) from reader where readerid='{0}'",textBox1.Text);
            //SqlCommand com = new SqlCommand(sql,mycon);
            //int count = (int)com.ExecuteScalar();
            //if (count==1)
            //{
            //    sql = string.Format("select count(*) from reader where readerpd='{0}'",textBox2.Text);
            //    com = new SqlCommand(sql, mycon);
            //    count = (int)com.ExecuteScalar();
            //    if (count>=1)
            //    {
            //        if (comboBox1.Text=="学生")
            //        {
            //            Form2 form2 = new Form2();
            //            this.Hide();
            //            form2.Show();
                          form2.readerid = textBox1.Text;
            //            mycon.Close();
            //        }
            //        else if (comboBox1.Text=="管理员")
            //        {
            //            Form4 form4 = new Form4();
            //            this.Hide();
            //            form4.Show();
            //            mycon.Close();
            //        }
            //        else
            //        {
            //            MessageBox.Show("请选择您的身份！");
            //        }
            //    }
            //    else
            //    {
            //        MessageBox.Show("密码错误，请重新输入！");
            //    }
            /