文章目录
- 前言
- 一、业务梳理与需求分析
- 1.功能描述
- 2.实现步骤
- 3.功能逻辑图
- 二、数据库设计
- 1.实体-关系（E-R图）概念模型设计
- 2.数据表设计
- 三、WinForm界面交互设计
- 1、界面交互逻辑
- 2、项目树
- 3、主界面+登录界面
- 4、 图书查询界面
- 5、图书借阅界面
- 6、图书插入界面
- 7、图书更新/删除界面
- 四、通用类设计
- 1、与MySQL通讯模块（整个类模块中删除命名空间等，值保留这个类）
- 2、数据库操作模块：
- 五、系统代码实现与分析
- 1、主界面代码：
- 2、登录界面代码
- 3、图书查询模块代码
- 4、图书借阅代码
- 5、图书插入代码
- 6、图书更新/删除代码
- 总结
前言
图书馆管理系统主要功能有普通用户（学生）借书、管理员管理图书。
一、业务梳理与需求分析
1.功能描述
- 系统中的普通用户模块有以下功能：
图书查询：根据输入的搜索条件进行查询，可以查找多项，也可以查找所有图书。
图书借阅：提供图书借阅证号，可以进行图书借阅。 - 系统中的管理员用户模块有以下功能：
图书查询：查询图书信息。
图书借阅：提供图书借阅证号，可以进行图书借阅。
增加图书：增添新图书。
修改图书：对图书信息进行修改。
删除图书：删除过时的、不能借阅的图书。
2.实现步骤
- 一个完整系统的数据库设计。
- 图书馆管理系统的界面设计。
- 项目的通用类。
- 图书馆管理系统代码的实现和分析。
3.功能逻辑图
二、数据库设计
1.实体-关系（E-R图）概念模型设计
2.数据表设计
根据需求分析进行数据库设计，数据库名称为BookManage，根据E-R图，有学生表、图书信息表、管理员表、借阅表。学生和管理员合并为一张用户表，增加一个字段用户权限进行区分。
-
用户表结构
- 图书信息表结构
- 图书借阅信息表结构
三、WinForm界面交互设计
1、界面交互逻辑
2、项目树
3、主界面+登录界面
4、 图书查询界面
5、图书借阅界面
6、图书插入界面
7、图书更新/删除界面
四、通用类设计
1、与MySQL通讯模块（整个类模块中删除命名空间等，值保留这个类）
public static class DBModule
{
public static string ServerIP = "**.**.**.**";
public static string ServerPort = "****";
public static string ServerUser = "****";
public static string ServerPassword = "****";
public static string ServerDBName = "bookmanage";
}
2、数据库操作模块：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;
using System.Data;
public class MySQLHelper
{
private MySqlConnection myConnection;
private string mErrorString;
//构造函数
public MySQLHelper(string strServerIP, string strServerPort, string strServerUser, string strPassword, string strDBName)
{
string strConnectionString = String.Format("server={0}; port={1}; user id={2}; password={3}; database={4}",
strServerIP, strServerPort, strServerUser, strPassword, strDBName);
myConnection = new MySqlConnection(strConnectionString);
}
//测试连接
public bool ConnectionTest()
{
bool result = false;
try
{
if (myConnection.State == System.Data.ConnectionState.Closed)
{
myConnection.Close();
result = true;
}
}
catch (MySqlException ex)
{
mErrorString = ex.ToString();
}
return result;
}
/// <summary>
/// 执行查询语句，用DataTable返回结果，调用前要传入DataTable的实例化对象作为参数
/// </summary>
/// <param name="strQuery">查询命令</param>
/// <param name="dt">返回数据表</param>
/// <returns></returns>
public bool ExcuteQuerySql(string strQuery, ref DataTable dt)
{
if (dt == null)
{
mErrorString = "传入的DataTable为null";
return false;
}
bool result = false;
try
{
MySqlCommand myCommand = new MySqlCommand(strQuery);
myCommand.Connection = myConnection;
if (myConnection.State == ConnectionState.Closed)
{
myConnection.Open();
}
dt.Load(myCommand.ExecuteReader());
result = true;
}
catch (MySqlException ex)
{
mErrorString = String.Format("ExcuteQuery {0} failed.", ex.ToString());
return false;
}
finally
{
myConnection.Close();
}
return result;
}
/// <summary>
/// 执行带参数的查询语句，使用前传入参数、DataTable实例化对象
/// </summary>
/// <param name="strQuery">查询语句</param>
/// <param name="param"></param>
/// <param name="dt"></param>
/// <returns></returns>
public bool ExcuteQuerySql(string strQuery, MySqlParameter[] param, ref DataTable dt)
{
if (dt == null)
{
mErrorString = "传入的DataTable为null.";
return false;
}
bool result = false;
try
{
MySqlCommand myCommand = new MySqlCommand(strQuery);
myCommand.Connection = myConnection;
if (myConnection.State == ConnectionState.Closed)
{
myConnection.Open();
}
for (int i = 0; i < param.Length; i++)
{
myCommand.Parameters.Add(param[i]);
}
dt.Load(myCommand.ExecuteReader());
result = true;
}
catch (MySqlException ex)
{
mErrorString = String.Format("ExcuteQuery {0} failed", strQuery) + ex.Message;
return false;
}
finally
{
myConnection.Close();
}
return result;
}
//执行非查询语句
public int ExcuteSql(string SqlCmdText)
{
int row = -1;
try
{
MySqlCommand myCommand = new MySqlCommand(SqlCmdText);
myCommand.CommandText = SqlCmdText;
myCommand.Connection = myConnection;
if (myConnection.State == ConnectionState.Closed)
{
myConnection.Open();
}
row = myCommand.ExecuteNonQuery();
}
catch (MySqlException ex)
{
mErrorString = String.Format("ExcuteNonQuery {0} failed", SqlCmdText);
}
return row;
}
//执行非查询语句
public int ExcuteSql(string[] SqlCmdText)
{
try
{
if (myConnection.State == ConnectionState.Closed)
{
myConnection.Open();
}
for (int i = 0; i < SqlCmdText.Length; i++)
{
MySqlCommand myCommand = new MySqlCommand(SqlCmdText[i]);
myCommand.CommandText = SqlCmdText[i];
myCommand.Connection = myConnection;
myCommand.ExecuteNonQuery();
}
}
catch (MySqlException ex)
{
mErrorString = String.Format("ExcuteNonQuery {0} failed", SqlCmdText) + ex.Message;
return -1;
}
return -1;
}
//执行带参数的非查询语句
public int ExcuteSql(string SqlCmdText, MySqlParameter[] param)
{
int row = -1;
try
{
MySqlCommand myCommand = new MySqlCommand(SqlCmdText);
myCommand.CommandText = SqlCmdText;
myCommand.Connection = myConnection;
if (myConnection.State == ConnectionState.Closed)
{
myConnection.Open();
}
for (int i = 0; i < param.Length; i++)
{
myCommand.Parameters.Add(param[i]);
}
row = myCommand.ExecuteNonQuery();
}
catch (MySqlException ex)
{
mErrorString = String.Format("ExecuteNonQuery {0} failed", SqlCmdText) + ex.Message;
return row = -1;
}
return row;
}
public string GetErrInfo()
{
return mErrorString;
}
}
五、系统代码实现与分析
1、主界面代码：
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 BookManage
{
public partial class FrmMain : Form
{
public static DialogResult result;//声明对话框返回对象
public FrmMain()
{
InitializeComponent();
}
/// <summary>
/// 查询子窗体是否存在
/// </summary>
/// <param name="childfrmname"></param>
/// <returns></returns>
public bool CheckChildFrm(string childfrmname)
{
foreach (Form childFrm in this.MdiChildren)//遍历子窗体
{
if (childFrm.Name == childfrmname)//如果子窗体存在
{
if (childFrm.WindowState == FormWindowState.Minimized)
{
childFrm.WindowState = FormWindowState.Normal;
}
childFrm.Activate();//激活该窗体
return true; //存在返回true
}
}
return false;//不存在返回false
}
/// <summary>
/// 用户登录菜单的事件处理
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void 用户登录ToolStripMenuItem_Click(object sender, EventArgs e)
{
//检测登录窗口是否打开
if (this.CheckChildFrm("FrmLogin") == true)
{
return;//窗口已经打开，返回
}
FrmLogin user = new FrmLogin();//实例化登录窗体
user.ShowDialog();//登录窗体以模式对话框的方式打开
//判断是否登录成功，登录成功则启用相应的菜单和按钮
if (result == System.Windows.Forms.DialogResult.OK && FrmLogin.ustate == 0)//普通用户
{
toolSBSearch.Enabled = true;
toolSBBookBorown.Enabled = true;
}
else if (result == System.Windows.Forms.DialogResult.OK && FrmLogin.ustate == 1)//管理员
{
toolSBSearch.Enabled = true;
toolSBBookBorown.Enabled = true;
toolMBookManage.Enabled = true;
}
}
/// <summary>
/// 用户登录按钮事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void toolSBLogin_Click(object sender, EventArgs e)
{
//检测登录窗口是否打开
if (this.CheckChildFrm("FrmLogin") == true)
{
return;//窗口已经打开，返回
}
FrmLogin user = new FrmLogin();//实例化登录窗体
user.ShowDialog();//登录窗体以模式对话框的方式打开
//判断是否登录成功，登录成功则启用相应的菜单和按钮
if (result == System.Windows.Forms.DialogResult.OK && FrmLogin.ustate == 0)//普通用户
{
//普通用户登录后使能按钮
toolSBSearch.Enabled = true;
toolSBBookBorown.Enabled = true;
}
else if (result == System.Windows.Forms.DialogResult.OK && FrmLogin.ustate == 1)//管理员
{
//管理员登录后使能按钮
toolSBSearch.Enabled = true;
toolSBBookBorown.Enabled = true;
toolMBookManage.Enabled = true;
}
}
/// <summary>
/// 图书查询按钮，转到图书查询界面
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void toolSBSearch_Click(object sender, EventArgs e)
{
if (this.CheckChildFrm("FrmBookSearch") == true)
{
return;
}
FrmBookSearch frmBookSearch = new FrmBookSearch();
frmBookSearch.MdiParent = this;//设置当前窗体的子窗体为frmBookSearch
frmBookSearch.Show();
}
/// <summary>
/// 图书借阅按钮，转到图书借阅界面
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void toolSBBookBorown_Click(object sender, EventArgs e)
{
if (this.CheckChildFrm("FrmBookBrown") == true)
{
return;
}
FrmBookBrown frmBookBrown = new FrmBookBrown();
frmBookBrown.MdiParent = this;//设置当前窗体的子窗体为frmBookBrown
frmBookBrown.Show();
}
/// <summary>
/// 图书插入按钮，转到图书插入界面
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void toolMBookIn_Click(object sender, EventArgs e)
{
if (this.CheckChildFrm("FrmBookIn") == true)
{
return;
}
FrmBookIn frmBookIn = new FrmBookIn();
frmBookIn.MdiParent = this;//设置当前窗体的子窗体为frmBookIn
frmBookIn.Show();
}
/// <summary>
/// 图书更新/删除按钮，转到图书更新与删除界面
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void toolMBookUpdate_Click(object sender, EventArgs e)
{
if (this.CheckChildFrm("FrmUpdateBook") == true)
{
return;
}
FrmUpdateBook frmUpdateBook = new FrmUpdateBook();
frmUpdateBook.MdiParent = this;//设置当前窗体的子窗体为frmUpdateBook
frmUpdateBook.Show();
}
private void toolSBExit_Click(object sender, EventArgs e)
{
if (MessageBox.Show("确认退出程序？", "确认信息", MessageBoxButtons.OKCancel) == System.Windows.Forms.DialogResult.OK)
{
System.Environment.Exit(0);
}
}
}
}
2、登录界面代码
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 BookManage
{
public partial class FrmLogin : Form
{
public FrmLogin()
{
InitializeComponent();
}
public static int ustate;//普通用户or管理员标志
FrmMain femmain = new FrmMain();
private void btnLogin_Click(object sender, EventArgs e)
{
//输入合法性判断
if (Volidity())//合法性通过
{
string state = this.cmbUserType.Text;
int num;
if (state.Equals("管理员"))//判断用户角色
{
num = 1;
}
else
{
num = 2;
}
//定义查询语句
string sql = String.Format("select * from user where uname='{0}' and upwd='{1}' and ustate='{2}'",
this.txtUserName.Text.Trim(), this.txtPwd.Text.Trim(), num);
MySQLHelper sqlHelper = new MySQLHelper(DBModule.ServerIP, DBModule.ServerPort, DBModule.ServerUser, DBModule.ServerPassword, DBModule.ServerDBName);
DataTable dt = new DataTable();
bool queryFlag = sqlHelper.ExcuteQuerySql(sql, ref dt);
if (queryFlag == false)
{
MessageBox.Show("登录失败，没有找到该用户");
}
if (dt.Rows.Count > 0)
{
MessageBox.Show("登录成功！");
FrmMain.result = DialogResult.OK;//为变量result赋值
DBModule.UserName = txtUserName.Text;
this.Close();
}
else
{
MessageBox.Show("用户名或密码错误，请重新输入");
}
}
}
/// <summary>
/// 验证合法性
/// </summary>
private bool Volidity()
{
if (this.txtPwd.Text != string.Empty && this.txtPwd.Text != string.Empty)
{
return true;
}
else
{
MessageBox.Show("用户名或密码不能为空");
}
return false;
}
private void btnCancel_Click(object sender, EventArgs e)
{
this.Close();
}
private void cmbUserType_SelectedIndexChanged(object sender, EventArgs e)
{
if (cmbUserType.SelectedIndex == 0)
{
cmbUserType.Text = "普通用户";
ustate = 0;
}
else
{
cmbUserType.Text = "管理员";
ustate = 1;
}
}
private void FromLogin_Load(object sender, EventArgs e)
{
this.cmbUserType.SelectedIndex = 0;
ustate = 0;
}
}
}
3、图书查询模块代码
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 BookManage
{
public partial class FrmBookSearch : Form
{
public FrmBookSearch()
{
InitializeComponent();
}
private void btnSearch_Click(object sender, EventArgs e)
{
string strBookType = cmbBokTyp.Text;
string strBookTypeOr = cmbBokTypOr.Text;
string strBookName = txtBokNm.Text;
string strBookNameOr = txtBokNmOr.Text;
string strBookConment = txtBokCotnt.Text;
//定义sql语句
string sql = "SELECT * FROM book WHERE booktype='" + strBookType + "'" + "or booktype='" + strBookTypeOr + "'" +
" and bookname='" + strBookName + "';";
MySQLHelper sqlHelper = new MySQLHelper(DBModule.ServerIP, DBModule.ServerPort, DBModule.ServerUser, DBModule.ServerPassword, DBModule.ServerDBName);
DataTable dt = new DataTable();
bool queryFlag = sqlHelper.ExcuteQuerySql(sql, ref dt);
if (queryFlag == false)
{
MessageBox.Show("查询失败，没有该图书信息");
}
if (dt.Rows.Count > 0)
{
dgvBookSearch.DataSource = dt;
}
//设置列名标题
string[] strColumnName = { "图书ID", "图书类别", "书名", "作者", "价格", "封面", "内容简介", "指定访问码"};
for (int i = 0; i < dgvBookSearch.Columns.Count; i++)
{
dgvBookSearch.Columns[i].HeaderText = strColumnName[i];
}
}
private void btnClose_Click(object sender, EventArgs e)
{
this.Close();
}
private void FrmBookSearch_Load(object sender, EventArgs e)
{
//图书类别的初始化
string sql = "SELECT DISTINCT booktype FROM book;";
MySQLHelper sqlHelper = new MySQLHelper(DBModule.ServerIP, DBModule.ServerPort, DBModule.ServerUser, DBModule.ServerPassword, DBModule.ServerDBName);
DataTable dtTtpe = new DataTable();
try
{
bool queryFlag = sqlHelper.ExcuteQuerySql(sql, ref dtTtpe);
if (queryFlag == false)
{
MessageBox.Show("查询图书类型失败");
}
}
catch (Exception ex)
{
MessageBox.Show("查询图书类型失败" + ex.ToString());
}
if (dtTtpe.Rows.Count > 0)
{
for (int i = 0; i < dtTtpe.Rows.Count; i++)
{
this.cmbBokTyp.Items.Add(dtTtpe.Rows[i][0].ToString());
this.cmbBokTypOr.Items.Add(dtTtpe.Rows[i][0].ToString());
}
}
this.cmbBokTyp.SelectedIndex = 0;
this.cmbBokTypOr.SelectedIndex = 0;
}
}
}
4、图书借阅代码
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 BookManage
{
public partial class FrmBookBrown : Form
{
public FrmBookBrown()
{
InitializeComponent();
}
DataTable dt = new DataTable();
MySQLHelper sqlHelper = new MySQLHelper(DBModule.ServerIP, DBModule.ServerPort, DBModule.ServerUser, DBModule.ServerPassword, DBModule.ServerDBName);
/// <summary>
/// 图书借阅按钮
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnBrown_Click(object sender, EventArgs e)
{
//获取下拉框中选中图书的ID
int bookid = Convert.ToInt32(this.cmbBookName.SelectedIndex + 1);
//获取用户的借阅证
int issid = Convert.ToInt32(this.txtIssueID.Text);
//获取借阅时间
DateTime date = Convert.ToDateTime(this.IssDatetime.Text);
//更新借阅信息
string sql = "insert into bookbrown (bookid, issbookid, issdatetime) values ('" + bookid + "', '" + issid + "', '" + date + "');";
//借阅信息中没有这本书才可借阅
DataTable dtC = new DataTable();
sqlHelper.ExcuteQuerySql("select bookid from bookbrown;", ref dtC);
int flagTmp = 0;
for (int i = 0; i < dtC.Rows.Count; i++)
{
if (Convert.ToInt32(dtC.Rows[i][0].ToString()) == bookid)
{
flagTmp = 1;
}
}
if (flagTmp == 1)
{
MessageBox.Show("这本书你已经借阅过，借阅不能超过1本", "提示信息", MessageBoxButtons.OK);
}
else
{
if (sqlHelper.ExcuteSql(sql) == 1)
{
MessageBox.Show("借阅成功");
}
else
{
MessageBox.Show("借阅失败");
}
}
//刷新借阅证中的图书信息
string sqlQ = "select bookinfo.bookid,bookname,issbookid,issdatetime from bookbrown,bookinfo where bookinfo.bookid=bookbrown.bookid;";
bool queryFlagQ = sqlHelper.ExcuteQuerySql(sqlQ, ref dt);
if (queryFlagQ == true)
{
this.dataGridView1.DataSource = dt;
}
}
private void btnCancel_Click(object sender, EventArgs e)
{
this.Close();
}
private void FrmBookBrown_Load(object sender, EventArgs e)
{
string sql = "select * from bookinfo;";
//联合图书信息表、借阅信息表查询
string sqlBro = "select bookinfo.bookid,bookname,issbookid,issdatetime from bookbrown,bookinfo where bookinfo.bookid=bookbrown.bookid;"; //主键与外键的关联
try
{
bool queryFlag = sqlHelper.ExcuteQuerySql(sql, ref dt);//查询图书信息
if (queryFlag == false)
{
MessageBox.Show("查询失败");
}
else
{
//自动加载图书名到下拉框
for (int i = 0; i < dt.Rows.Count; i++)
{
this.cmbBookName.Items.Add(dt.Rows[i][1].ToString());
}
}
//联合查询查询本人借阅信息
DataTable dtBro=new DataTable();
bool queryFlagBro = sqlHelper.ExcuteQuerySql(sqlBro, ref dtBro);
if (queryFlagBro == true)
{
this.dataGridView1.DataSource = dtBro;
}
else
{
MessageBox.Show("查询借阅信息失败");
}
//查询用户信息
string sqlU = "select * from user where uname= '" + DBModule.UserName + "';";
DataTable dtU = new DataTable();
bool queryFlagU = sqlHelper.ExcuteQuerySql(sqlU, ref dtU);
if (queryFlagU == true)
{
this.txtUserName.Text = dtU.Rows[0]["uname"].ToString();
this.txtIssueID.Text = dtU.Rows[0]["upwd"].ToString();
}
//初始化列名
string[] strColumnName = { "图书编号", "图书名称", "指定访问码", "借阅时间"};
for (int i = 0; i < dt.Columns.Count; i++)
{
dataGridView1.Columns[i].HeaderText=strColumnName[i];
}
}
catch (Exception ex)
{
MessageBox.Show("");
}
}
/// <summary>
/// 图书名称选项变化的事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void cmbBookName_SelectedIndexChanged(object sender, EventArgs e)
{
//遍历图书信息表，查询和选中书名相同的信息，加载到界面
foreach (DataRow row in dt.Rows)
{
if (cmbBookName.Text == row["bookname"].ToString())
{
this.txtBookIssue.Text = row["bookissue"].ToString();
this.txtBookAuthor.Text = row["bookauthor"].ToString();
}
}
}
}
}
5、图书插入代码
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 BookManage
{
public partial class FrmBookIn : Form
{
public FrmBookIn()
{
InitializeComponent();
}
/// <summary>
/// 图书插入按钮
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnInsert_Click(object sender, EventArgs e)
{
//定义变量接收控件的值
string strBookType = txtBookType.Text;
string strBookName = txtBookName.Text;
string strAuthor = txtAuthor.Text;
string strPrice = txtPrice.Text;
string strPic = txtPic.Text;
string strContent = txtContent.Text;
string strIssue = txtIssue.Text;
if (Vaildate())
{
//sql语句
string sql = "insert into bookinfo (bookname, booktype, bookauthor, bookprice, bookpic, bookcontent, bookissue)"
+ " values ('" + strBookName + "', '" + strBookType + "', '" + strAuthor + "', '" + strPrice + "', '" +
strPic + "', '" + strContent + "', '" + strIssue + "');";
MySQLHelper sqlHelper = new MySQLHelper(DBModule.ServerIP, DBModule.ServerPort, DBModule.ServerUser, DBModule.ServerPassword, DBModule.ServerDBName);
int result=sqlHelper.ExcuteSql(sql);
if (result == 1)
{
MessageBox.Show("添加成功", "提示", MessageBoxButtons.OK);
}
else
{
MessageBox.Show("添加失败", "提示", MessageBoxButtons.OK);
}
DataTable dt = new DataTable();
sqlHelper.ExcuteQuerySql("select * from bookinfo;", ref dt);
this.dataGridView1.DataSource = dt;
//设置列名标题
string[] strColumnName = { "图书ID", "图书类别", "书名", "作者", "价格", "封面", "内容简介", "指定访问码" };
for (int i = 0; i < dataGridView1.Columns.Count; i++)
{
dataGridView1.Columns[i].HeaderText = strColumnName[i];
}
}
}
/// <summary>
/// 退出图书界面按钮
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnExit_Click(object sender, EventArgs e)
{
this.Close();
}
/// <summary>
/// 输入合法性验证
/// </summary>
/// <returns></returns>
private bool Vaildate()
{
if (txtBookType.Text != string.Empty && txtBookName.Text != string.Empty && txtAuthor.Text != string.Empty
&& txtPrice.Text != string.Empty && txtPic.Text != string.Empty && txtContent.Text != string.Empty && txtIssue.Text != string.Empty)
{
return true;
}
else
{
MessageBox.Show("请出入完整信息");
}
return false;
}
}
}
6、图书更新/删除代码
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 BookManage
{
public partial class FrmUpdateBook : Form
{
public FrmUpdateBook()
{
InitializeComponent();
}
MySQLHelper sqlHelper = new MySQLHelper(DBModule.ServerIP, DBModule.ServerPort, DBModule.ServerUser, DBModule.ServerPassword, DBModule.ServerDBName);
/// <summary>
/// 保存信息
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnSave_Click(object sender, EventArgs e)
{
string sql = "select * from bookinfo;";
DataTable dt = new DataTable();
if (MessageBox.Show("确实要将修改保存到数据库？", "提示信息", MessageBoxButtons.OKCancel) == System.Windows.Forms.DialogResult.OK)
{
bool queryFlag = sqlHelper.ExcuteQuerySql(sql, ref dt);
if (queryFlag == true)
{
MessageBox.Show("保存成功");
}
this.dataGridView1.DataSource = dt;
}
//设置列名标题
string[] strColumnName = { "图书ID", "图书类别", "书名", "作者", "价格", "封面", "内容简介", "指定访问码" };
for (int i = 0; i < dataGridView1.Columns.Count; i++)
{
dataGridView1.Columns[i].HeaderText = strColumnName[i];
}
}
/// <summary>
/// 更新信息
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnUpdate_Click(object sender, EventArgs e)
{
string strBookType = txtBookType.Text;
string strBookName = txtBookName.Text;
string strBookAuthor = txtBookAuthor.Text;
string strBookPrice = txtBookPrice.Text;
string strBookPic = txtBookPic.Text;
string strBookContent = txtBookContent.Text;
string strBookIssue = txtBookIssue.Text;
if (true)
{
string sql = string.Format("update bookinfo set booktype='{0}', bookname='{1}', bookauthor='{2}', bookprice='{3}', bookpic='{4}', bookcontent='{5}',bookissue='{6}' where bookid={7};",
strBookType, strBookName, strBookAuthor, strBookPrice, strBookPic, strBookContent, strBookIssue, Convert.ToInt32(txtBookID.Text));
if (sqlHelper.ExcuteSql(sql) == 1)
{
MessageBox.Show("更新成功", "提示信息", MessageBoxButtons.OK);
}
else
{
MessageBox.Show("更新失败", "提示信息", MessageBoxButtons.OK);
}
}
}
/// <summary>
/// 删除信息
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnDelete_Click(object sender, EventArgs e)
{
if (this.txtBookID.Text != string.Empty)
{
string sql = "select * from bookbrown where bookid=" + Convert.ToInt32(txtBookID.Text) + "";
DataTable dt = new DataTable();
bool queryFlag = sqlHelper.ExcuteQuerySql(sql, ref dt);
if (queryFlag == true && dt.Rows.Count > 0)
{
MessageBox.Show("此书有借阅，不能删除");
}
else
{
string sqlDe = "delete from bookinfo where bookid=" + this.txtBookID.Text + "";
if (sqlHelper.ExcuteSql(sqlDe) == 1)
{
MessageBox.Show("删除成功", "提示信息", MessageBoxButtons.OK);
}
else
{
MessageBox.Show("删除失败", "提示信息", MessageBoxButtons.OK);
}
}
}
}
/// <summary>
/// 取消
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnCancel_Click(object sender, EventArgs e)
{
}
/// <summary>
/// 验证输入合法性
/// </summary>
/// <returns></returns>
private bool Vaildate()
{
if (txtBookType.Text != string.Empty && txtBookName.Text != string.Empty && txtBookAuthor.Text != string.Empty
&& txtBookPrice.Text != string.Empty && txtBookPic.Text != string.Empty
&& txtBookContent.Text != string.Empty && txtBookIssue.Text != string.Empty && txtBookID.Text != string.Empty)
{
return true;
}
else
{
MessageBox.Show("请出入完整信息");
}
return false;
}
}
}
总结
本项目实现一个简单的图书馆管理系统，是一个完整的图书馆管理系统的简化版。通过这个项目，了解整个桌面应用软件的规范化开发流程，业务梳理、需求分析、概要设计、详细设计、数据库设计、界面交互设计、详细代码设计等步骤。同时将代码开发规范融入其中，尽量使用较为规范的代码。加深了对WinForm界面控件的认识，对MySQL更加熟悉。数据库SQL语言操作还需要多联系，纸上得来终觉浅，觉知此事要躬行。SQL语句看似简单，实际操作起来是出问题最多的地方。
![[单片机框架][调试功能] 回溯案发现场](https://img-blog.csdnimg.cn/4ad2c43b241046289764ab1727591f86.png)
