用C#实现一个简单的图书管理系统（课程设计）

持盾的紫眸

107061人浏览 · 2016-06-12 14:53:22

持盾的紫眸 · 2016-06-12 14:53:22 发布

用C#(sharp)实现一个简单的图书管理系统（课程设计）

学校的数据库课程结束了，要求完成一个课程设计，于是我用C#实现了一个简单的图书管理系统（ADO.NET）

源码放在了github上，仅供参考：https://github.com/ygsama/BooK-Library-System

一、首先把数据库脚本贴出来(数据库名为library)

USE [library]
GO
/****** Object:  Table [dbo].[books]    Script Date: 06/12/2016 11:27:12 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[books](
	[bNum] [nvarchar](10) NOT NULL,
	[bName] [nvarchar](60) NOT NULL,
	[bAuthor] [nvarchar](60) NOT NULL,
	[bPubCom] [nvarchar](50) NOT NULL,
	[bPubDat] [nvarchar](20) NOT NULL,
	[ISBN] [nvarchar](50) NOT NULL,
	[bPrice] [nvarchar](10) NOT NULL,
	[bTag] [nvarchar](10) NOT NULL,
 CONSTRAINT [PK_books] PRIMARY KEY CLUSTERED 
(
	[bNum] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000001', N'数据库', N'123', N'123出版社', N'2012-09', N'978-1-23465-8', N'56', N'2')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000002', N'编程珠玑', N'Jon·Bentley', N'人民邮电出版社', N'2015-01', N'978-7-115-35761-8', N'39', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000003', N'C陷阱与缺陷', N'Andrew·Koeing', N'人民邮电出版社', N'2009-09', N'978-7-115-17179-5', N'30', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000004', N'C专家编程', N'Peter Van Der Linden', N'人民邮电出版社', N'2009-09', N'978-7-115-17108-1', N'45', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000005', N'Python网络数据采集', N'Ryan Mitchell', N'人民邮电出版社', N'2016-03', N'978-7-115-41629-2', N'59', N'4')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000006', N'Flask Web开发', N'Miguel Grinberg', N'人民邮电出版社', N'2015-01', N'978-7-115-37399-1', N'59', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000007', N'C和指针', N'Kenneth A·Reek', N'人民邮电出版社', N'2009-12', N'978-7-115-17201-3', N'65', N'4')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000008', N'汇编语言', N'王爽', N'清华大学出版社', N'2015-05', N'978-7-302-33314-2', N'36', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000009', N'Python Cookbook', N'David Beazley & Brian K.Jones', N'人民邮电出版社', N'2015-05', N'978-7-115-37959-7', N'108', N'4')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000010', N'Python基础教程', N'Magnue Lie Hetland', N'人民邮电出版社', N'2015-09', N'978-7-115-35352-8', N'79', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000011', N'程序员代码面试指南', N'左程云', N'电子工业出版社', N'2015-09', N'978-7-121-27011-6', N'79', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000012', N'CLR via C#', N'Jeffrey Richter', N'清华大学出版社', N'2015-05', N'978-7-302-38097-9', N'109', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000013', N'大国崛起', N'唐晋', N'人民出版社', N'2011-03', N'7-01-006006-1', N'56', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000014', N'自控力', N'凯利·麦格尼格尔', N'文化发展出版社', N'2012-08', N'978-7-5142-0503-9', N'39.8', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000015', N'麦肯锡思维', N'Rob Koplowitz', N'企业管理出版社', N'2012-08', N'978-7-5164-1050-9', N'39.8', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000016', N'哈佛谈判心理学', N'Rrica Ariel Fox', N'中国友谊出版公司', N'2014-11', N'978-7-5057-3422-7', N'49.8', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000017', N'领导力21法则', N'John C Maxwell', N'时代出版传媒股份有限公司', N'2016-01', N'978-7-5699-0647-9', N'45', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000018', N'斯坦福极简经济学', N'Timothy Taylor', N'湖南人民出版社', N'2015-02', N'978-7-5561-0739-1', N'35', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000019', N'拖延心理学', N'Jane B Birka & Lenora M Yuen', N'中国人民大学出版社', N'2009-12', N'978-7-300-11390-6', N'39.8', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000020', N'英语魔法师之语法俱乐部', N'旋元佑', N'九州出版社', N'2001-05', N'7-80114-627-1', N'35', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000021', N'赖世雄美语音标', N'赖世雄', N'外文出版社', N'2016-05', N'978-7-119-08680-4', N'20', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000022', N'人性的弱点', N'戴尔·卡耐基', N'人民日报出版社', N'2015-05', N'978-7-5115-3089-9', N'29.8', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000023', N'重新定义公司 谷歌是如何运营的', N'Eric Schmidt & Jonethan Rosenberg & Alan Eagle', N'中信出版集团', N'2015-09', N'978-7-5086-5359-4', N'49', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000024', N'从0到1 开启商业与未来的秘密', N'Peter Thiel', N'中信出版社', N'2015-01', N'978-7-5086-4971-9', N'45', N'5')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000025', N'代码大全2', N'Steven McConnell', N'电子工业出版社', N'2015-06', N'978-7-121-02298-2', N'128', N'0')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000026', N'胡适的北大哲学课 壹古代哲学', N'胡适', N'新世界出版社', N'2014-04', N'978-7-5104-4841-6', N'30', N'3')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000027', N'胡适的北大哲学课 贰中古哲学', N'胡适', N'新世界出版社', N'2014-04', N'978-7-5104-4841-6', N'30', N'3')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000028', N'胡适的北大哲学课 叁近世哲学', N'胡适', N'新世界出版社', N'2014-04', N'978-7-5104-4841-6', N'30', N'3')
INSERT [dbo].[books] ([bNum], [bName], [bAuthor], [bPubCom], [bPubDat], [ISBN], [bPrice], [bTag]) VALUES (N'000029', N'胡适的北大哲学课 肆世界哲学', N'胡适', N'新世界出版社', N'2014-04', N'978-7-5104-4841-6', N'30', N'3')
/****** Object:  Table [dbo].[admin]    Script Date: 06/12/2016 11:27:12 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[admin](
	[aId] [nvarchar](20) NOT NULL,
	[aPwd] [nvarchar](20) NOT NULL,
	[aName] [nvarchar](20) NOT NULL,
	[aGender] [nvarchar](20) NOT NULL,
	[aPhoNum] [nvarchar](20) NOT NULL,
 CONSTRAINT [PK_admin] PRIMARY KEY CLUSTERED 
(
	[aId] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
INSERT [dbo].[admin] ([aId], [aPwd], [aName], [aGender], [aPhoNum]) VALUES (N'1', N'1', N'张三', N'男', N'12345678999')
INSERT [dbo].[admin] ([aId], [aPwd], [aName], [aGender], [aPhoNum]) VALUES (N'111111', N'111111', N'李四', N'女', N'12311112222')
INSERT [dbo].[admin] ([aId], [aPwd], [aName], [aGender], [aPhoNum]) VALUES (N'2', N'2', N'张三', N'男', N'12311111111')
INSERT [dbo].[admin] ([aId], [aPwd], [aName], [aGender], [aPhoNum]) VALUES (N'222222', N'222222', N'李四', N'女', N'12322221111')
/****** Object:  Table [dbo].[borrow]    Script Date: 06/12/2016 11:27:12 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[borrow](
	[ID] [nvarchar](50) NOT NULL,
	[uId] [nvarchar](20) NOT NULL,
	[bName] [nvarchar](60) NOT NULL,
	[bNum] [nvarchar](10) NOT NULL,
	[bPrice] [nvarchar](10) NOT NULL,
	[borrowDate] [varchar](20) NOT NULL,
	[returnDate] [varchar](20) NOT NULL,
	[Tag] [nvarchar](10) NOT NULL,
 CONSTRAINT [PK_borrow] PRIMARY KEY CLUSTERED 
(
	[ID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
INSERT [dbo].[borrow] ([ID], [uId], [bName], [bNum], [bPrice], [borrowDate], [returnDate], [Tag]) VALUES (N'000001', N'2', N'C专家编程', N'000004', N'45', N'2016/06/10', N'2016/09/08', N'0')
INSERT [dbo].[borrow] ([ID], [uId], [bName], [bNum], [bPrice], [borrowDate], [returnDate], [Tag]) VALUES (N'000003', N'2', N'数据库', N'000001', N'56', N'2016/06/10', N'2016/08/09', N'0')
INSERT [dbo].[borrow] ([ID], [uId], [bName], [bNum], [bPrice], [borrowDate], [returnDate], [Tag]) VALUES (N'000005', N'2', N'数据库', N'000001', N'56', N'2016/06/10', N'2016/08/09', N'0')
INSERT [dbo].[borrow] ([ID], [uId], [bName], [bNum], [bPrice], [borrowDate], [returnDate], [Tag]) VALUES (N'000006', N'2', N'数据库', N'000001', N'56', N'2016/06/10', N'2016/08/09', N'0')
INSERT [dbo].[borrow] ([ID], [uId], [bName], [bNum], [bPrice], [borrowDate], [returnDate], [Tag]) VALUES (N'000007', N'2', N'Python网络数据采集', N'000005', N'59', N'2016/06/10', N'2016/09/08', N'0')
INSERT [dbo].[borrow] ([ID], [uId], [bName], [bNum], [bPrice], [borrowDate], [returnDate], [Tag]) VALUES (N'000008', N'2', N'C和指针', N'000007', N'65', N'2016/06/10', N'2016/09/08', N'0')
INSERT [dbo].[borrow] ([ID], [uId], [bName], [bNum], [bPrice], [borrowDate], [returnDate], [Tag]) VALUES (N'000009', N'2', N'Python Cookbook', N'000009', N'108', N'2016/06/10', N'2016/08/09', N'0')
/****** Object:  Table [dbo].[users]    Script Date: 06/12/2016 11:27:12 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[users](
	[uId] [nvarchar](20) NOT NULL,
	[uPwd] [nvarchar](20) NOT NULL,
	[uName] [nvarchar](20) NOT NULL,
	[uGender] [nvarchar](20) NOT NULL,
	[uPhoNum] [nvarchar](20) NOT NULL,
	[uBan] [nvarchar](20) NOT NULL,
 CONSTRAINT [PK_users] PRIMARY KEY CLUSTERED 
(
	[uId] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
INSERT [dbo].[users] ([uId], [uPwd], [uName], [uGender], [uPhoNum], [uBan]) VALUES (N'1', N'1', N'张三', N'男', N'12345678999', N'0')
INSERT [dbo].[users] ([uId], [uPwd], [uName], [uGender], [uPhoNum], [uBan]) VALUES (N'111111', N'111111', N'李四', N'女', N'11122221111', N'0')
INSERT [dbo].[users] ([uId], [uPwd], [uName], [uGender], [uPhoNum], [uBan]) VALUES (N'123456', N'123456', N'李四', N'女', N'12312341234', N'1')
INSERT [dbo].[users] ([uId], [uPwd], [uName], [uGender], [uPhoNum], [uBan]) VALUES (N'2', N'2', N'王五', N'男', N'12312313123', N'0')
INSERT [dbo].[users] ([uId], [uPwd], [uName], [uGender], [uPhoNum], [uBan]) VALUES (N'333333', N'333333', N'张三', N'男', N'12311112222', N'0')
INSERT [dbo].[users] ([uId], [uPwd], [uName], [uGender], [uPhoNum], [uBan]) VALUES (N'a123456', N'a123456', N'王五', N'女', N'12312341234', N'0')
/****** Object:  StoredProcedure [dbo].[Date_Test]    Script Date: 06/12/2016 11:27:12 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
create proc [dbo].[Date_Test]
as  
select uId into #A from borrow where convert(varchar(20),GETDATE(),111)>= returnDate group by uId
update borrow set Tag='1' where convert(varchar(20),GETDATE(),111)>= returnDate
update users set uBan='1' where uId in(select uId from #A)
drop table #A
GO
/****** Object:  View [dbo].[booksWithbookindex]    Script Date: 06/12/2016 11:27:12 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
create view [dbo].[booksWithbookindex]
as
select ROW_NUMBER()over(order by bNum ) as bookindex,* from books
GO

二、定义一个MyDictionary类和定义一个SqlHelper类（封装复杂的SQL操作）

namespace 图书管理系统
{
    // 因为要频繁使用Dictionary<string, string> 
    // 所以用一个自定义类MyDictionary继承Dictionary<string, string> 
    public class MyDictionary : Dictionary<string, string>
    {
    }
}

namespace 图书管理系统
{
    public static class SqlHelper
    {
        // 获取数据库连接   返回连接对象
        private static SqlConnection GetConn()
        {
            return new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["library"].ConnectionString);
        }

        // 执行sql操作   返回是否存在用户
        public static bool IsUserExists(string uId)
        {
            bool isExists = false;

            using (SqlConnection conn = GetConn())
            {
                string sql = "select count(*) from users where uId =@uId";
                SqlCommand cmd = new SqlCommand(sql, conn);
                cmd.Parameters.Add(new SqlParameter("@uId", uId));
                conn.Open();
                int obj = Convert.ToInt32(cmd.ExecuteScalar());// 返回受影响的行数
                if (obj > 0)
                {
                    isExists = true;
                }
            }
            return isExists;
        }

        // 执行sql操作   返回是否存在书名
        public static bool IsBookExistsWithName(string bName)
        {
            bool isExists = false;

            using (SqlConnection conn = GetConn())
            {
                string sql = "select count(*) from books where bName =@bName";
                SqlCommand cmd = new SqlCommand(sql, conn);
                cmd.Parameters.Add(new SqlParameter("@bName", bName));
                conn.Open();
                int obj = Convert.ToInt32(cmd.ExecuteScalar());// 返回受影响的行数
                if (obj > 0)
                {
                    isExists = true;
                }
            }
            return isExists;
        }
        // 执行sql操作   返回是否存在此书籍序列号
        public static bool IsBookExistsWithNum(string bNum)
        {
            bool isExists = false;

            using (SqlConnection conn = GetConn())
            {
                string sql = "select count(*) from books where bNum =@bNum";
                SqlCommand cmd = new SqlCommand(sql, conn);
                cmd.Parameters.Add(new SqlParameter("@bNum", bNum));
                conn.Open();
                int obj = Convert.ToInt32(cmd.ExecuteScalar());// 返回受影响的行数
                if (obj > 0)
                {
                    isExists = true;
                }
            }
            return isExists;
        }

        // 执行 ...   返回受影响行数
        private static int ExecuteNonQuery(string sql, CommandType type, params SqlParameter[] ps)
        {
            int rows = -1;

            using (SqlConnection conn = GetConn())
            {
                SqlCommand cmd = new SqlCommand(sql, conn);
                cmd.CommandType = type; // 存储过程 type为StoredProcedure
                cmd.Parameters.AddRange(ps);
                conn.Open();
                rows = cmd.ExecuteNonQuery();
            }

            return rows;
        }
        public static int ExecuteNonQuery(string sql, MyDictionary  dic)
        {
            SqlParameter[] ps = new SqlParameter[dic.Count];
            int index = 0;
            foreach (var item in dic)
            {
                ps[index++] = new SqlParameter(item.Key, item.Value);
            }
            return ExecuteNonQuery(sql, CommandType.Text, ps);
        }
        public static int ExecuteNonQuery(string sql, CommandType type, MyDictionary dic)
        {
            SqlParameter[] ps = new SqlParameter[dic.Count];
            int index = 0;
            foreach (var item in dic)
            {
                ps[index++] = new SqlParameter(item.Key, item.Value);
            }
            return ExecuteNonQuery(sql, type, ps);
        }


        // 执行sql语句   返回首行首列
        public static object ExecuteScalar(string sql)
        {
            object obj = null;
            using (SqlConnection conn = GetConn())
            {
                SqlCommand cmd = new SqlCommand(sql, conn);
                conn.Open();
                obj = cmd.ExecuteScalar();
            }
            return obj;
        }
        public static object ExecuteScalar(string sql, CommandType type, MyDictionary dic)
        {
            object obj = null;
            using (SqlConnection conn = GetConn())
            {
                SqlCommand cmd = new SqlCommand(sql, conn);
                cmd.CommandType = type;

                //构造参数
                SqlParameter[] ps = new SqlParameter[dic.Count];
                int index = 0;
                foreach (var item in dic)
                {
                    ps[index++] = new SqlParameter(item.Key, item.Value);
                }
                cmd.Parameters.AddRange(ps);
                //执行命令
                conn.Open();
                obj = cmd.ExecuteScalar();
            }
            return obj;
        }
        public static object ExecuteScalar(string sql, MyDictionary dic)
        {
            return ExecuteScalar(sql, CommandType.Text, dic);
        }

        // 执行查询  返回结果集DataTable  获取列表
        public static DataTable GetList(string sql, MyDictionary  dic)
        {
            // 构造数据表，用于存储查询的数据
            DataTable dt = new DataTable();
            // 创建连接对象
            using (SqlConnection conn = GetConn())
            {
                // 执行命令
                SqlCommand cmd = new SqlCommand(sql, conn);
                // 构造参数
                SqlParameter[] ps = new SqlParameter[dic.Count];
                int index = 0;
                foreach (var item in dic)
                {
                    ps[index++] = new SqlParameter(item.Key, item.Value);
                }
                cmd.Parameters.AddRange(ps);
                // 执行命令
                SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                adapter.Fill(dt);
            }
            return dt;
        }
    }
}

三、各个窗体及实现

1.登陆界面

namespace 图书管理系统
{
    public partial class LoginForm : Form
    {
        public LoginForm()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
             // 获取账号
             string Id = txtId.Text.Trim();
             // 获取密码
             string Pwd = txtPwd.Text.Trim();

             if (Id == "" || Pwd == "")
             {
                 MessageBox.Show("请输入账号或密码");
             }
             else 
             {
                 string str = System.Configuration.ConfigurationManager.ConnectionStrings["library"].ConnectionString;
                 // 构造sql查询语句
                 string sql;
                 if (rBtn1.Checked == true)
                 {
                     sql = "select uName from users where uId='" + Id + "' and uPwd='" + Pwd + "'";
                 }
                 else 
                 {
                     sql = "select aName from admin where aId='" + Id + "' and aPwd='" + Pwd + "'";
                 }
                 // 构造连接对象
                 using (SqlConnection conn = new SqlConnection(str))       
                 {
                     SqlCommand cmd = new SqlCommand(sql, conn);
                     // 打开数据库连接
                     conn.Open();                                          
                     // 执行查询语句,返回结果集第一行第一列
                     string name = cmd.ExecuteScalar().ToString ();       
                     
                     if (name != "")
                     {
                         // 登录窗体隐藏
                         this.Hide();
                         // 创建主窗体
                         MainForm mainForm = new MainForm();
                         // 将账号传给主窗体MainForm
                         mainForm.Id = Id;
                         // 用主窗体MainForm下的_Tag标记登陆的是用户还是管理员
                         if (rBtn1.Checked == true)                   
                         {
                             mainForm._Tag = "user";
                             mainForm.Name1 = name;

                             sql = "select uBan from users where uId='" + Id + "' and uPwd='" + Pwd + "'";
                             cmd = new SqlCommand(sql, conn);
                             string b = cmd.ExecuteScalar().ToString();
                             mainForm.B = b;
                         }
                         else
                         {
                             mainForm._Tag = "admin";
                             mainForm.Name1 = name;
                         }
                         // 显示主窗体
                         mainForm.ShowDialog();                         
                     }
                     else 
                     {
                         MessageBox.Show("账号或密码错误！","登录失败");
                     }
                 }
             }
        }
    }
}

2.主界面

namespace 图书管理系统
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        private string _id;// 账号
        public string Id
        {
            get { return _id; }
            set { _id = value; }
        }

        private string _name;
        public string Name1 // 姓名
        {
            get { return _name; }
            set { _name = value; }
        }

        // 权限标记 值为admin为管理员 ，值为user则为普通用户
        private string _tag;
        public string _Tag
        {
            get { return _tag; }
            set { _tag = value; }
        }

        // 标记账户是否被锁定  1为锁定 
        private string _b;  
        public string B
        {
            get { return _b; }
            set { _b = value; }
        }

        // 在加载窗体时设定操作权限
        private void MainForm_Load(object sender, EventArgs e)
        {
            if (_Tag == "user")
            {
                tSSL2.Text = "权限级别：普通用户";
                tSSL5.Text = "   " + Name1;
                // 权限为用户时 将部分功能关闭
                新用户注册.Enabled = false;
                锁定用户.Enabled = false;
                新书入库.Enabled = false;
                借书.Enabled = false;
                还书.Enabled = false;
                书籍注销.Enabled = false;
                用户信息查询.Enabled = false;
                添加用户.Enabled = false;
                添加书籍.Enabled = false;
                借书办理.Enabled = false;
                还书办理.Enabled = false;
                if (B == "1")
                {
                    toolStripStatusLabel3.Text = " 状态：被锁定";
                    MessageBox.Show("账户被锁定，请尽快联系管理员", "警告");
                }
            }
            else
            {
                tSSL2.Text = "权限级别：管理员";
                tSSL5.Text = "   " + Name1;
            } 
        }

        #region 关于、帮助
        private void 关于软件ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            MessageBox.Show("请联系管理员", "关于");
        }

        private void toolStripButton6_Click(object sender, EventArgs e)
        {
            MessageBox.Show("请联系管理员", "注意");
        }
        #endregion

        // 时钟
        private void timer1_Tick(object sender, EventArgs e)
        {
            xxx.Text = DateTime.Now.ToString();
        }

        // 退出时关闭所有窗口（login）
        private void MainForm_FormClosed(object sender, FormClosedEventArgs e)
        {
            Application.Exit(); 
        }

        #region 修改密码
        private void APF()
        {
            AlterPwdForm altPF = new AlterPwdForm();
            altPF.Id = Id;
            altPF._Tag = _Tag;
            altPF.ShowDialog();
        }
        private void 修改密码_Click(object sender, EventArgs e)
        {
            APF();
        }
        private void toolStripButton8_Click(object sender, EventArgs e)
        {
            APF();
        }
        #endregion

        #region 修改个人信息
        private void UIF()
        {
            UpdateIndivForm uIF = new UpdateIndivForm();
            uIF.Id = Id;
            uIF._Tag = _Tag;
            uIF.ShowDialog();
        }
        private void 修改信息_Click(object sender, EventArgs e)
        {
            UIF();
        }
        private void toolStripButton7_Click(object sender, EventArgs e)
        {
            UIF();
        }
        #endregion

        #region 添加用户
        private void NewUser()
        {
            UpdateIndivForm uIF = new UpdateIndivForm();
            uIF.Id = Id;
            uIF._Tag = _Tag;
            uIF.P = "1";
            uIF.Text = "新用户注册";
            uIF.ShowDialog();
        }
        private void 添加用户_Click(object sender, EventArgs e)
        {
            NewUser();
        }
        private void 新用户注册_Click(object sender, EventArgs e)
        {
            NewUser();
        }
        #endregion

        #region 注销用户
        private void 注销用户_Click(object sender, EventArgs e)
        {
            UpdateIndivForm deleteForm = new UpdateIndivForm();
            deleteForm.Text = "注销用户";
            deleteForm.P = "2";
            deleteForm.ShowDialog();
        }
        #endregion

        #region 添加书籍
        private static void INB()
        {
            新书入库Form iNB = new 新书入库Form();
            iNB.ShowDialog();
        }
        private void 添加书籍_Click(object sender, EventArgs e)
        {
            INB();
        }
        private void 新书入库_Click(object sender, EventArgs e)
        {
            INB();
        }
        #endregion

        #region 书籍注销
        private void 书籍注销_Click(object sender, EventArgs e)
        {
            新书入库Form iNB = new 新书入库Form();
            iNB.P = "1";
            iNB.Text = "注销书籍";
            iNB.ShowDialog();
        }
        #endregion

        #region 书籍查询
        private void 图书查询_Click(object sender, EventArgs e)
        {
            FindBookForm fbf = new FindBookForm();
            fbf.ShowDialog();
        }

        private void 查找书籍_Click(object sender, EventArgs e)
        {
            FindBookForm fbf = new FindBookForm();
            fbf.Tag1 = this._Tag;
            fbf.ShowDialog();
        }
        #endregion

        #region 借书办理
        private void 借书办理_Click(object sender, EventArgs e)
        {
            BorrowBooks bb = new BorrowBooks();
            bb.ShowDialog();
        }
        private void 借书_Click(object sender, EventArgs e)
        {
            BorrowBooks bb = new BorrowBooks();
            bb.ShowDialog();
        }        
        #endregion

        #region 还书办理
        private void 还书办理_Click(object sender, EventArgs e)
        {
            ReturnBooks rb = new ReturnBooks();
            rb.ShowDialog();
        }
        private void 还书_Click(object sender, EventArgs e)
        {
            ReturnBooks rb = new ReturnBooks();
            rb.ShowDialog();
        }        
        #endregion

        #region 借书单查询
        private void 借书单查询_Click(object sender, EventArgs e)
        {
            MessageBox.Show("功能暂未开放");
        }
        private void 查询借书记录_Click(object sender, EventArgs e)
        {
            MessageBox.Show("功能暂未开放");
        }        
        #endregion


        private void 用户信息查询_Click(object sender, EventArgs e)
        {
            MessageBox.Show("该功能暂未开放");
        }
    }
}

3.新用户注册、修改个人信息、注销用户界面在同一个窗体（图片略）

namespace 图书管理系统
{
    public partial class UpdateIndivForm : Form
    {
        public UpdateIndivForm()
        {
            InitializeComponent();
        }
        private string _id;
        public string Id
        {
            get { return _id; }
            set { _id = value; }
        }
        // 权限标记 值admin为管理员 ，值为user则为普通用户
        private string _tag;
        public string _Tag
        {
            get { return _tag; }
            set { _tag = value; }
        }
        // P标记用来决定是否隐藏panel
        private string _p;
        public string P
        {
            get { return _p; }
            set { _p = value; }
        }

        // 加载个人信息
        private void UpdateIndivForm_Load(object sender, EventArgs e)
        {
            if (P == "1")       // p == "1"  为注册新用户功能
            {
                注册用户panel.Visible = true;
                注销用户panel.Visible = false;
            }
            else if (P == "2")  // p == "2"  为注销用户功能
            {
            }
            else                //          为修改个人信息
            {
                注册用户panel.Visible = false;
                注销用户panel.Visible = false ;
                string str = System.Configuration.ConfigurationManager.ConnectionStrings["library"].ConnectionString;
                string sql;
                if (_Tag == "user")
                {
                    sql = "select * from users where uId='" + Id + "'";
                }
                else
                {
                    sql = "select * from admin where aId='" + Id + "'";
                }
                using (SqlConnection conn = new SqlConnection(str))
                {
                    SqlCommand cmd = new SqlCommand(sql, conn);
                    conn.Open();
                    // ExecuteReader()返回一个Datareader对象，内容是与命令匹配的所有行
                    using (SqlDataReader r = cmd.ExecuteReader())
                    {
                        r.Read();
                        账号textBox.Text = r.GetString(0);
                        姓名textBox.Text = r.GetString(2);
                        电话号码textBox.Text = r.GetString(4);
                        if (_Tag == "user")
                        {
                            if (r.GetString(5) == "1")
                            {
                                label7.Text = "被锁定,请尽快联系管理员办理解锁";
                            }
                            else
                            {
                                label7.Text = "正常";
                            }
                        }
                        else
                        {
                            label7.Text = "正常";
                        }

                        if (r.GetString(3) == "男")
                        {
                            男radioButton.Checked = true;
                        }
                        else
                        {
                            女radioButton.Checked = true;
                        }
                    }
                    cmd.Dispose();
                }
                提交button.Visible = false;
            }
        }

        #region 提交修改个人信息  
        private void 姓名textBox_TextChanged(object sender, EventArgs e)
        {
            提交button.Visible = true;
        }
        private void 账号textBox_TextChanged(object sender, EventArgs e)
        {
            if (账号textBox.Text!= Id)
            {
                提交button.Visible = true;
            }
            else
            {
                提交button.Visible = false;
            }
        }
        private void 男radioButton_CheckedChanged(object sender, EventArgs e)
        {
            提交button.Visible = true;
        }
        private void 电话号码textBox_TextChanged(object sender, EventArgs e)
        {
            提交button.Visible = true;
        }

        private void 提交button_Click(object sender, EventArgs e)
        { 
            // 判断账号是否存在
            if (账号textBox.Text != Id)
            {
                if (SqlHelper.IsUserExists(uIdTb.Text.Trim()))
                {
                    MessageBox.Show("账号已存在", "操作失败");
                    return;
                }
            }

            // 完成用户的修改
            string uName = 姓名textBox.Text.Trim();
            string uId = 账号textBox.Text.Trim();
            string uPhoNum = 电话号码textBox.Text.Trim();
            string uGender;
            if (男radioButton.Checked == true)
            {
                uGender = "男";
            }
            else
            {
                uGender = "女";
            }
            // 构造sql语句
            string sql;
            if (_Tag == "user")
            {
                sql = "update users set uId =@uId,uName=@uName,uGender=@uGender,uPhoNum=@uPhoNum where uId=@ID";
            }
            else
            {
                sql = "update admin set aId =@uId,aName=@uName,aGender=@uGender,aPhoNum=@uPhoNum where aId=@ID";
            }
            MyDictionary dic = new MyDictionary();
            dic.Add("@uId", uId);
            dic.Add("@uName", uName);
            dic.Add("@uGender", uGender);
            dic.Add("@uPhoNum", uPhoNum);
            dic.Add("@ID", Id);
            // 执行并返回
            int i = SqlHelper.ExecuteNonQuery(sql, dic);

            if (i == 1)
            {
                MessageBox.Show("提交完成");
            }
            this.Close();

        }       
        #endregion


        private void 注册完成button_Click(object sender, EventArgs e)
        {
            string uGender = "";
            if (uIdTb.Text.Trim().Length < 6)
            {
                MessageBox.Show("账号长度应该大于6");
            }
            else if (uPwdTb.Text.Trim().Length < 6)
            {
                MessageBox.Show("密码长度应该大于6");
            }
            else if (uNameTb.Text.Trim().Length < 2 || uNameTb.Text.Trim().Length > 15)
            {
                MessageBox.Show("姓名长度应该大于1并且小于等于15");
            }
            else if (注册rBtn男.Checked == false && 注册rBtn女.Checked == false)
            {
                MessageBox.Show("请选择性别");
            }
            else if (Regex.IsMatch(uPhoNumTb.Text.Trim(), @"^1\d{10}$") != true && Regex.IsMatch(uPhoNumTb.Text.Trim(), @"^(\d{3,4}-)?\d{6,8}$") != true)
            {
                MessageBox.Show("请输入合法的手机号码或电话号码");
            }
            else
            {
                // 判断判断账号是否存在
                if (SqlHelper.IsUserExists(uIdTb.Text.Trim()))
                {
                    MessageBox.Show("账号已存在","操作失败");
                    return;
                }
                
                if(注册rBtn男.Checked == true )
                {
                    uGender ="男";
                }
                else 
                {
                    uGender ="女";
                }

                // 添加新用户
                string sql = "insert into users(uId,uPwd,uName,uGender,uPhoNum,uBan) values(@id,@pwd,@name,@gender,@phonum,'0')";
                MyDictionary  dic = new MyDictionary ();
                dic.Add("@id", uIdTb.Text.Trim());
                dic.Add("@pwd", uPwdTb.Text.Trim());
                dic.Add("@name", uNameTb.Text.Trim());
                dic.Add("@gender", uGender);
                dic.Add("@phonum", uPhoNumTb.Text.Trim());
                int i = SqlHelper.ExecuteNonQuery(sql, dic);
                if (i == 1)
                {
                    MessageBox.Show("成功注册新用户");
                    this.Close();
                }
                else
                {
                    MessageBox.Show("操作失败,请联系管理员");
                }
            }
        }

        private void 注销Btn_Click(object sender, EventArgs e)
        {
            // 判断账号是否存在
            if (!SqlHelper.IsUserExists(deletTB.Text.Trim()))
            {
                MessageBox.Show("账号不存在", "操作失败");
                return;
            }
            else
            {
                DialogResult dt = MessageBox.Show("确定要注销此用户吗", "提示", MessageBoxButtons.OKCancel);
                if (dt != DialogResult.OK)
                {
                    return;
                }
                else
                {
                    string sql = "delete from users where uId=@id";
                    MyDictionary dic = new MyDictionary();
                    dic.Add("@id", deletTB.Text.Trim());
                    int i = SqlHelper.ExecuteNonQuery(sql, dic);
                    if (i == 1)
                    {
                        MessageBox.Show("注销成功");
                    }
                }
                this.Close();
            }
        }
    }
}

4.修改密码界面（图片略）

namespace 图书管理系统
{
    public partial class AlterPwdForm : Form
    {
        public AlterPwdForm()
        {
            InitializeComponent();
        }
        private string _id;
        public string Id
        {
            get { return _id; }
            set { _id = value; }
        }
        // 权限标记 值admin为管理员 ，值为user则为普通用户
        private string _tag;
        public string _Tag
        {
            get { return _tag; }
            set { _tag = value; }
        }

        private void APbtn_Click(object sender, EventArgs e)
        {
            string sql;
            if (textBox1.Text.Trim() == "" || textBox2.Text.Trim() == "" || textBox3.Text.Trim() == "")
            {
                MessageBox.Show("请填写完整", "警告");
            }
            else if (textBox2.Text.Trim().Length < 6 || textBox3.Text.Trim().Length < 6)
            {
                MessageBox.Show("新密码长度必须大于六位", "提示");
            }
            else if (textBox2.Text.Trim() != textBox3.Text.Trim())
            {
                MessageBox.Show("两次输入的新密码不一致","警告");
            }
            else
            {
                
                if (_Tag == "user")
                {
                    sql = "update users set uPwd =@uPwd where uId=@uId and uPwd=@uPwdd";

                }
                else
                {
                    sql = "update admin set aPwd = @uPwd where aId=@uId and aPwd=@uPwdd";
                }
                MyDictionary dic1 = new MyDictionary();
                dic1.Add("@uPwd", textBox2.Text.Trim());
                dic1.Add("@uId", Id.ToString());
                dic1.Add("@uPwdd", textBox1.Text.Trim());
                int n = SqlHelper.ExecuteNonQuery(sql, dic1);
                if (n > 0)
                {
                    MessageBox.Show("修改成功", "OK");
                    this.Close();
                }
                else
                {
                    MessageBox.Show("密码错误", "警告");
                }
            }
        }
    }
}

5.借书办理窗口

namespace 图书管理系统
{
    public partial class BorrowBooks : Form
    {
        public BorrowBooks()
        {
            InitializeComponent();
        }

        private void 查书btn_Click(object sender, EventArgs e)
        {
            if (查寻书名tB.Text.Trim() == "")
            {
                MessageBox.Show("书名不能为空");
            }
            else 
            {
                string sql = "select bNum,bName,bAuthor,bPubCom,bPrice,bTag from booksWithbookindex where bName like '%'+ @bName +'%'";
                MyDictionary dic = new MyDictionary();
                dic.Add("@bName", 查寻书名tB.Text.Trim());
                DataTable dt = SqlHelper.GetList(sql, dic);
                dataGridView1.DataSource = dt;
            }
        }

        private void 提交借书_Click(object sender, EventArgs e)
        {
            // 是否存在该用户
            if (uIdTb.Text.Trim() == ""|| comboBox1.Text.ToString().Trim() == "")
            {
                MessageBox.Show("请填写用户名和借阅时间！", "警告");
                return;
            }
            else if (bNumTB.Text.Trim() == "" || bNameTB.Text.Trim() == "" || bPriceTB.Text.Trim() == "")
            {
                MessageBox.Show("请选择书籍！","警告");
            }
            else if (!SqlHelper.IsUserExists(uIdTb.Text.Trim()))
            {
                MessageBox.Show("不存在该用户！", "警告");
                return;
            }
            else
            {
                // 自动获得图书序列号
                string sql = " select COUNT(*)+1 from borrow";
                string ID = SqlHelper.ExecuteScalar(sql).ToString();
                StringBuilder sb = new StringBuilder(ID);
                while (sb.Length != 6)
                {
                    sb.Insert(0, "0");
                }
                ID = sb.ToString();

                // 查询书籍库存量
                sql = "select bTag from books where bNum=@bNum";
                MyDictionary dic1 = new MyDictionary();
                dic1.Add("@bNum", bNumTB.Text.Trim());
                string n = SqlHelper.ExecuteScalar(sql, dic1).ToString();
                if (n == "0")
                {
                    MessageBox.Show("该书籍库存量为零！","警告");
                    return ;
                }

                // 插入数据到借书表（borrow）
                sql = "insert into borrow values(@ID,@uId,@bName,@bNum,@bPrice,convert(varchar(20),GETDATE() ,111),convert(varchar(20),dateadd(day," + comboBox1.Text.ToString().Substring(0, 2) + ",CONVERT(varchar(20),GETDATE() ,111)),111),@Tag)";
                MyDictionary dic = new MyDictionary();
                dic.Add("@ID", ID);
                dic.Add("@uId", uIdTb.Text.Trim());
                dic.Add("@bName", bNameTB.Text.Trim());
                dic.Add("@bNum", bNumTB.Text.Trim());
                dic.Add("@bPrice", bPriceTB.Text.Trim());
                dic.Add("@Tag", "0");// Tag = 0 标记该书未超归还期限 
                int i = SqlHelper.ExecuteNonQuery(sql, dic);
                if (i > 0)
                {
                   n = (Convert.ToInt32(n) - 1).ToString(); // 库存量-1
                    sql = "update books set bTag=@bTag where bNum=@bNum";
                    MyDictionary dic2 = new MyDictionary();
                    dic2.Add("@bTag", n);
                    dic2.Add("@bNum", bNumTB.Text.Trim());
                    SqlHelper.ExecuteScalar(sql, dic2);
                    MessageBox.Show("提交成功");
                }
            }
        }
        // 表格单元格鼠标MouseUp事件
        private void dataGridView1_CellMouseUp(object sender, DataGridViewCellMouseEventArgs e)
        {
            // 开关文本框的锁定，将表格内的数据显示到文本框内
            int a = dataGridView1.CurrentRow.Index;
            bNumTB.ReadOnly = false;
            bNameTB.ReadOnly = false;
            bPriceTB.ReadOnly = false;
            bNumTB.Text = dataGridView1.Rows[a].Cells["bNum"].Value.ToString();
            bNameTB.Text = dataGridView1.Rows[a].Cells["bbName"].Value.ToString();
            bPriceTB.Text = dataGridView1.Rows[a].Cells["bPrice"].Value.ToString();
            bNumTB.ReadOnly = true;
            bNameTB.ReadOnly = true;
            bPriceTB.ReadOnly = true;
        }
    }
}

6.还书办理窗口

namespace 图书管理系统
{
    public partial class ReturnBooks : Form
    {
        public ReturnBooks()
        {
            InitializeComponent();
        }

        private void Btn1_Click(object sender, EventArgs e)
        {
            if (Btn1.Text.Trim() == "")
            {
                MessageBox.Show("账号不能为空");
            }
            else
            {
                ShowBorrowList();
            }
        }

        private void ShowBorrowList()
        {
            string sql = "select ID,uId,bName,bNum,bPrice,borrowDate,returnDate,Tag from borrow where uId =@uId";
            MyDictionary dic = new MyDictionary();
            dic.Add("@uId", uIdTB.Text.Trim());
            DataTable dt = SqlHelper.GetList(sql, dic);
            dataGridView1.DataSource = dt;
        }

        private void dataGridView1_CellMouseUp(object sender, DataGridViewCellMouseEventArgs e)
        {
            // 开关文本框的锁定，将表格内的数据显示到文本框内
            int a = dataGridView1.CurrentRow.Index;
            IDDTB.ReadOnly = false;
            bNameTB.ReadOnly = false;
            bPriceTB.ReadOnly = false;
            bNumTB.ReadOnly = false;
            uuIdTB.ReadOnly = false;
            TagTB.ReadOnly = false;
            borrowDateTB.ReadOnly = false;
            returnDateTB.ReadOnly = false;
            IDDTB.Text = dataGridView1.Rows[a].Cells["ID"].Value.ToString();
            bNameTB.Text = dataGridView1.Rows[a].Cells["bName"].Value.ToString();
            bPriceTB.Text = dataGridView1.Rows[a].Cells["bPrice"].Value.ToString();
            bNumTB.Text = dataGridView1.Rows[a].Cells["bNum"].Value.ToString();
            uuIdTB.Text = dataGridView1.Rows[a].Cells["uId"].Value.ToString();
            TagTB.Text = (dataGridView1.Rows[a].Cells["Tag"].Value.ToString() == "1") ? "是" : "否";
            borrowDateTB.Text = dataGridView1.Rows[a].Cells["borrowDate"].Value.ToString();
            returnDateTB.Text = dataGridView1.Rows[a].Cells["returnDate"].Value.ToString();
            IDDTB.ReadOnly = true;
            bNameTB.ReadOnly = true;
            bPriceTB.ReadOnly = true;
            bNumTB.ReadOnly = true;
            uuIdTB.ReadOnly = true;
            TagTB.ReadOnly = true;
            borrowDateTB.ReadOnly = true;
            returnDateTB.ReadOnly = true;
        }

        #region 处理逾期未还书的用户
        // 窗口加载时处理借书表内逾期的记录 
        private void ReturnBooks_Load(object sender, EventArgs e)
        {
            // 文本框锁定
            IDDTB.ReadOnly = true;
            bNameTB.ReadOnly = true;
            bPriceTB.ReadOnly = true;
            bNumTB.ReadOnly = true;
            uuIdTB.ReadOnly = true;
            TagTB.ReadOnly = true;
            borrowDateTB.ReadOnly = true;
            returnDateTB.ReadOnly = true;

            // Date_Test存储过程
            // 将逾期未还书的标记 (Tag 置为 1)
            // 并将其用户冻结 (uBan 置为 1)
            // create proc Date_Test
            // as 
            // select uId into #A from borrow where convert(varchar(20),GETDATE(),111)>= returnDate group by uId
            // update borrow set Tag='1' where convert(varchar(20),GETDATE(),111)>= returnDate
            // update users set uBan='1' where uId in(select uId from #A)
            // drop table #A
            string sql = "Date_Test";
            MyDictionary dic = new MyDictionary();
            SqlHelper.ExecuteNonQuery(sql, CommandType.StoredProcedure, dic);
        }
        #endregion

        private void button1_Click(object sender, EventArgs e)
        {
            string sql="select uBan from users where uId=@uID";
            MyDictionary dic3 = new MyDictionary();
            dic3.Add("@uID", uuIdTB.Text.Trim());
            if (SqlHelper.ExecuteScalar(sql, dic3).ToString() == "1")
            {
                MessageBox.Show("因逾期未还书账户被锁定，请及时解锁，并缴纳罚款");
                return;
            }
            else 
            {
                // 办理借书手续
                // 删除借书记录 
                sql = "delete from borrow where ID=@ID";
                MyDictionary dic4 = new MyDictionary();
                dic4.Add("@ID", IDDTB.Text.Trim());
                SqlHelper.ExecuteNonQuery(sql, dic4);

                // 得到书籍库存量 并+1
                sql = "select bTag from books where bNum=@bNum";
                MyDictionary dic5 = new MyDictionary();
                dic5.Add("@bNum", bNumTB.Text.Trim());
                int n = Convert.ToInt32(SqlHelper.ExecuteScalar(sql, dic5)) + 1;

                sql = "update books set bTag=@bTag where bNum=@bNum";
                MyDictionary dic6 = new MyDictionary();
                dic6.Add("@bTag", n.ToString());
                dic6.Add("@bNum", bNumTB.Text.Trim());
                SqlHelper.ExecuteNonQuery(sql, dic6);

                MessageBox.Show("还书提交完成");

                // 刷新借书单
                ShowBorrowList();

            }
        }
    }
}

7.新书入库和注销书籍窗口

这个窗口用了panel实现了：新书入库、注销书籍两个功能（图片略）

namespace 图书管理系统
{
    public partial class 新书入库Form : Form
    {
        public 新书入库Form()
        {
            InitializeComponent();
        }

        private string _p;  // p=="1"时为书籍注销操作
        public string P
        {
            get { return _p; }
            set { _p = value; }
        }

        private void 新书入库Form_Load(object sender, EventArgs e)
        {
            if (P != "1")
            {
                书籍注销panel.Visible = false;
            }
        }

        private void 新书入库Btn_Click(object sender, EventArgs e)
        {
            if (bNameTB.Text.Trim() == "" || bAuthorTB.Text.Trim() == "" || bPubComTB.Text.Trim() == "" || ISBN.Text.Trim() == "" || bTagTB.Text.Trim() == "" || bPriceTB.Text.Trim() == "" || bPubDatTB.Text.Trim() == "")
            {
                MessageBox.Show("请填写完整信息", "失败");
            }
            else
            {
                // 自动获得图书序列号
                string sql = " select COUNT(*)+1 from books";
                string bNum = SqlHelper.ExecuteScalar(sql).ToString();
                StringBuilder sb = new StringBuilder(bNum);
                while (sb.Length != 6)
                {
                    sb.Insert(0, "0");
                }
                bNum = sb.ToString();
                
                // 添加操作
                sql = "insert into books values(@bNum,@bName,@bAuthor,@bPubCom,@bPubDat,@ISBN,@bPrice,@bTag)";
                MyDictionary dic = new MyDictionary();
                dic.Add("@bNum", bNum);
                dic.Add("@bName", bNameTB.Text.Trim());
                dic.Add("@bAuthor", bAuthorTB.Text.Trim());
                dic.Add("@bPubCom", bPubComTB.Text.Trim());
                dic.Add("@bPubDat", bPubDatTB.Text.Trim());
                dic.Add("@ISBN", ISBN.Text.Trim());
                dic.Add("@bPrice", bPriceTB.Text.Trim());
                dic.Add("@bTag", bTagTB.Text.Trim());
                int i = SqlHelper.ExecuteNonQuery(sql, dic);
                if (i == 1)
                {
                    MessageBox.Show("添加成功,图书序列号为" + bNum);
                }
            }
        }

        private void 注销书籍Btn_Click(object sender, EventArgs e)
        {
            // 判断账号是否存在
            if (!SqlHelper.IsBookExistsWithNum(注销书籍TB.Text.Trim()))
            {
                MessageBox.Show("书籍不存在", "操作失败");
                return;
            }
            else
            {
                DialogResult dt = MessageBox.Show("确定要注销此书吗", "提示", MessageBoxButtons.OKCancel);
                if (dt != DialogResult.OK)
                {
                    return;
                }
                else
                {
                    string sql = "delete from books where bNum=@bNum";
                    MyDictionary dic = new MyDictionary();
                    dic.Add("@bNum", 注销书籍TB.Text.Trim());
                    int i = SqlHelper.ExecuteNonQuery(sql, dic);
                    if (i == 1)
                    {
                        MessageBox.Show("注销成功");
                    }
                }
                this.Close();
            }
        }
    }
}

8.查询书籍窗口

namespace 图书管理系统
{
    public partial class FindBookForm : Form
    {
        public FindBookForm()
        {
            InitializeComponent();
        }
        private string _tag;
        public string Tag1
        {
            get { return _tag; }
            set { _tag = value; }
        }

        // pageIndex 标记DGV应该显示第几页
        private int pageIndex;
        // pageIndex 标记DGV的总页数
        int maxIndex;

        #region 添加书籍
        private static void INB()
        {
            新书入库Form iNB = new 新书入库Form();
            iNB.ShowDialog();
        }
        private void 新书入库ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            INB();
        }
        private void 书籍入库tSBtn_Click(object sender, EventArgs e)
        {
            INB();
        }

        #endregion

        #region 注销书籍
        private void 注销书籍ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            新书入库Form iNB = new 新书入库Form();
            iNB.P = "1";
            iNB.Text = "注销书籍";
            iNB.ShowDialog();
        }
        #endregion

        #region 查看帮助
        private void 查看帮助ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            MessageBox.Show("请联系管理员", "帮助");
        }
        private void 查看帮助tSBtn_Click(object sender, EventArgs e)
        {
            MessageBox.Show("请联系管理员", "帮助");
        }

        #endregion

        private void FindBookForm_Load(object sender, EventArgs e)
        {
            if (Tag1 == "user")
            {
                注销书籍ToolStripMenuItem.Enabled = false;
                修改ToolStripMenuItem.Enabled = false;
                新书入库ToolStripMenuItem.Enabled = false;
                书籍入库tSBtn.Enabled = false;
                保存修改tSBtn.Enabled = false;
                dgv_list.ReadOnly = true;
            }
            pageIndex = 1;
            GetData();
        }

        private void GetData()
        {
            // 获取页大小
            int pageSize = 14;
            // 计算最多有多少页--Math.Ceiling--向上取整
            // Convert.ToInt32(SqlHelper.ExecuteScalar("select count(*) from books"))得到数据记录总数
            maxIndex = (int)Math.Ceiling((Convert.ToInt32(SqlHelper.ExecuteScalar("select count(*) from books")) * 1.0 / pageSize));
            // 获取连接字符串
            string str = System.Configuration.ConfigurationManager.ConnectionStrings["library"].ConnectionString;
            // 得到连接
            using (SqlConnection conn = new SqlConnection(str))
            {
                // 判断是否有数据
                // Convert.ToInt32(SqlHelper.ExecuteScalar("select count(*) from books"))得到数据记录总数
                if (Convert .ToInt32 (SqlHelper.ExecuteScalar("select count(*) from books")) > 0 && pageIndex > 0)
                {
                    // 确定有数据才进行查询
                    // 创建表格，用来存储数据
                    DataTable dt = new DataTable();
                    // 构造带分页功能的 sql 语句
                    string sql = "select bNum,bName,bAuthor,bPubCom,bPubDat,ISBN,bPrice,bTag from booksWithbookindex where bookindex between @sIndex and @eIndex";
                    // 构造适配器对象
                    SqlDataAdapter adapter = new SqlDataAdapter(sql, conn);
                    // 传递参数
                    // 本页第一条数据
                    adapter.SelectCommand.Parameters.AddWithValue("@sIndex", ((pageIndex - 1) * pageSize + 1));
                    // 本页最后一条数据
                    adapter.SelectCommand.Parameters.AddWithValue("@eIndex", pageIndex * pageSize);
                    // 执行查询
                    conn.Open();
                    adapter.Fill(dt);
                    dgv_list.DataSource = dt;
                }
                else if (pageIndex <= 0)
                {
                    pageIndex = 1;
                }
                else
                {
                    MessageBox.Show("没有获取到数据","警告");
                }
            }
        }

        private void 刷新书库tSBtn_Click(object sender, EventArgs e)
        {
            if (pageIndex <= 0)
            {
                pageIndex = 1;
            }
            GetData();
        }
        private void 刷新ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (pageIndex <= 0)
            {
                pageIndex = 1;
            }
            GetData();
        }

        private void 跳转至首页tSBtn_Click(object sender, EventArgs e)
        {
            pageIndex = 1;
            GetData();
        }

        private void 跳转至上一页tSBtn_Click(object sender, EventArgs e)
        {
            pageIndex--;
            if (pageIndex <= 0)
            {
                pageIndex = 1;
            }
            GetData();
        }

        private void 跳转至下一页页tSBtn_Click(object sender, EventArgs e)
        {
            pageIndex++;
            if (pageIndex > maxIndex )
            {
                pageIndex--;
                MessageBox.Show("哎呀，到底啦 ！","提示");
            }
            GetData();
        }

        private void 跳转至最后一页tSBtn_Click(object sender, EventArgs e)
        {
            pageIndex = maxIndex;
            GetData();
        }

        private void 保存修改tSBtn_Click(object sender, EventArgs e)
        {
            MessageBox.Show("功能暂未开放");
            /*
             * 
             * 
            // 若绑定数据源则用dgv_list.DataSource as DataTable;
            // 未绑定则用DgvToTable()强制转换
            // = DgvToTable(dgv_list);
            DataTable dt=dgv_list.DataSource as DataTable;
            // 完成adapter的UpdateCommand
            string str = System.Configuration.ConfigurationManager.ConnectionStrings["library"].ConnectionString;
            using (SqlConnection conn = new SqlConnection(str))
            {

                SqlDataAdapter adapter = new SqlDataAdapter();

                // 构造UpdateCommand
                string update = "update books set bName=@bName, bAuthor=@bAuthor,bPubCom=@bPubCom,bPubDat=@bPubDat,ISBN=@ISBN,bPrice=@bPrice,bTag=@bTag where bNum=@bNum";
                SqlCommand updateCmd = new SqlCommand(update, conn);
                updateCmd.Parameters.Add("@bName", SqlDbType.NVarChar , 60, "bName");
                updateCmd.Parameters.Add("@bAuthor", SqlDbType.NVarChar, 60, "bAuthor");
                updateCmd.Parameters.Add("@bPubCom", SqlDbType.NVarChar, 50, "bPubCom");
                updateCmd.Parameters.Add("@bPubDat", SqlDbType.NVarChar, 20, "bPubDat");
                updateCmd.Parameters.Add("@ISBN", SqlDbType.NVarChar, 50, "ISBN");
                updateCmd.Parameters.Add("@bPrice", SqlDbType.NVarChar, 10, "bPrice");
                updateCmd.Parameters.Add("@bTag", SqlDbType.NVarChar, 10, "bTag");
                updateCmd.Parameters.Add("@bNum", SqlDbType.NVarChar, 10, "bNum");
                adapter.UpdateCommand = updateCmd;

                // 执行
                conn.Open();
                adapter.Update(dt);
            }

            // 刷新数据
            GetData();
            MessageBox.Show("保存成功");
            *
            *
            */
        }
        private void 修改ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            MessageBox.Show("功能暂未开放");
        }

        private void 按书名查找tSBtn_Click(object sender, EventArgs e)
        {
            string sql = "select bNum,bName,bAuthor,bPubCom,bPubDat,ISBN,bPrice,bTag from booksWithbookindex where bName like '%'+ @bName +'%'";
            MyDictionary dic = new MyDictionary();
            dic.Add("@bName", 书名tSTB.Text.Trim());
            DataTable dt = SqlHelper.GetList(sql, dic);
            dgv_list.DataSource = dt;
        }
    }
}

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