毕业设计——基于QT+MySQL实现的图书管理系统
1.1 介绍
本项目设计并实现了一个精简的多用户图书管理系统，应用后端通过与 mysql 进行连接实现对数据的管理，数据存储在本地。游客可以查阅图书信息；用户可以登陆、注册、查看图书，借书、还书等操作；管理员可以通过登陆界面实现对用户和书籍的管理，具有添加/删除用户/书籍等权限。
1.2 运行环境介绍、配置及测试
开发平台： Windows / QT5.5.1 / MySQL5.6
上述QT和Mysql软件的安装可以参考Mysql安装与基础使用（QT、Matlab）。
软件安装后，需要配置Mysql环境如下：
1.确认Mysql的端口使用3306，数据库登录的用户名和密码均设置为root，这些是我工程中的基本链接配置；
2.新建数据库mydatabase，命令为：create database mydatabase; ；
3.数据库mydatabase下新建四个表格：用户（user）、管理员（manager）、图书（book）、借阅信息（borrow）。命令为：
use mydatabase;
create table user(
id varchar(20) primary key not null,
name varchar(20) not null,
password varchar(20) not null,
canBorrow boolean not null
);
create table manager(
id varchar(20) primary key not null,
name varchar(20) not null,
password varchar(20) not null
);
create table book(
book_id varchar(20) primary key,
name varchar(20) not null,
author_name varchar(20),
price numeric(9,2),
num int not null,
stock int not null,
publisher varchar(20),
publish_year year,
type varchar(20) not null
);
create table borrow(
user_id varchar(20),
book_id varchar(20),
borrow_date date,
return_date date,
primary key(user_id,book_id),
foreign key (user_id) references user(id),
foreign key (book_id) references book(book_id)
);上述表中变量的含义（按顺序）：
①用户：学号（主键），姓名，密码、借阅权限
②管理员：账号（主键），姓名，密码
③图书：书籍编号（主键），书名，作者，价格，总库存，剩余量，出版社，出版年份，分类
④借阅信息：用户学号，书籍编号，借阅时间，归还时间
4.为了测试，默认添加1个管理员，3个用户，4本书
insert into manager (id , name, password) values ("0", "管理员", "0");
insert into user (id , name, password,canBorrow) values ("1", "任哲昆", "1",true);
insert into user (id , name, password,canBorrow) values ("2", "tom", "2",true);
insert into user (id , name, password,canBorrow) values ("3", "jime", "3",false);
insert into book (book_id, name, author_name, price, num, stock, publisher, publish_year, type)
values ("00001", "C++ Primer 中文版", "Stanley B. Lippman", 128, 10, 10, "电子工业出版社", "2013", "计算机类");
insert into book (book_id, name, author_name, price, num, stock, publisher, publish_year, type)
values ("00002", "月光落在左手上", "余秀华", 58, 2, 2, "北京十月文艺出版社", "2020", "文学类");
insert into book (book_id, name, author_name, price, num, stock, publisher, publish_year, type)
values ("00003", "清代地方政府", "瞿同祖", 78, 5, 5, "新星出版社", "2022", "历史类");
insert into book (book_id, name, author_name, price, num, stock, publisher, publish_year, type)
values ("00004", "从格致到科学", "张剑", 66, 8, 8, "中国工人出版社", "2022", "哲学类");5.对于exe测试，可以直接打开前面下载的工程文件下的\EXE\LibraryManageByMysqlQt_boxed.exe，此时没有出现无法创建数据库连接，则环境配置成功。
另外，对于源码，需要在LibraryManageByMysqlQt\文件夹下新建debug和release文件夹，并将工程构建目录选择为LibraryManageByMysqlQt下，编译源码即可运行。
核心代码：
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
/********** 类中变量初始化（主要针对指针） **********/
loginwindow = NULL;
registerwindow = NULL;
userdetailwindow=NULL;
bookdetailwindow=NULL;
addbookwindow = NULL;
booksearchwidget = NULL;
bookborrowinfowidget=NULL;
usermanagementwidget=NULL;
bookmanagementwidget=NULL;
people=NULL;
timer = NULL;
/********** 标题界面部分 **********/
// 标题界面背景
ui->widget_Title->setAutoFillBackground(true);
QPalette palette;
palette.setBrush(QPalette::Background, QBrush(QPixmap(":/images/titleBackground.jpg")));
ui->widget_Title->setPalette(palette);
// 配置标题界面中的按钮：登录、注册、退出登录
ui->Button_login->setFlat(true);
ui->Button_register->setFlat(true);
ui->Button_quitLogin->setFlat(true);
ui->Button_quitLogin->setDisabled(true); // 默认 退出登录按钮 隐藏
ui->Button_quitLogin->hide();
// 标题界面中的label更新（根据people的值，在timer中定时更新）
people = new People();
people->user_Type = People::VISITOR;
people->user_Name = "游客";
people->user_ID="";
people->user_Password="";
people->user_canBorrow=false;
people->booknum=0;
timer = new QTimer();
connect(timer, SIGNAL(timeout()), this, SLOT(SLOT_updatetime()));
timer->start(500);
/********** 连接数据库 **********/
db = QSqlDatabase::addDatabase("QMYSQL");
db.setHostName("localhost");
db.setPort(3306);
db.setDatabaseName("mydatabase"); // 数据库名
db.setUserName("root"); // 数据库用户名
db.setPassword("root"); // 数据库的密码
if(!db.open())
{
QMessageBox::critical(NULL, "Error", "注意：无法创建数据库连接！", QMessageBox::Yes);
}
/********** tabWidget界面部分 **********/
// 删除UI控件自带的页面，注意：需要从大到小删除
ui->tabWidget->removeTab(1);
ui->tabWidget->removeTab(0);
// 初始时，默认使用者为 游客 ，所以tabWidget只添加并显示 图书搜索页面
booksearchwidgetCreate(); // 新建
bookquerySearchUpdate(); // 刷新显示，默认“所有类型”
ui->tabWidget->addTab(booksearchwidget,"图书搜索");
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::SLOT_updatetime()
{
QDateTime current_date_time = QDateTime::currentDateTime();
QString current_date = current_date_time.toString("yyyy-MM-dd hh:mm:ss ddd");
QString text = "当前用户: " + people->user_Name + " 当前时间: " + current_date + " ";
ui->label_Title->setText(text);
}
void MainWindow::closeEvent(QCloseEvent *event)
{
// 防止内存泄漏和野指针
delete timer;
timer=NULL;
delete people;
people=NULL;
//window 自动清理
if(loginwindow!=NULL)
{
loginwindow->close();
}
if(registerwindow!=NULL)
{
registerwindow->close();
}
if(userdetailwindow!=NULL)
{
userdetailwindow->close();
}
if(bookdetailwindow!=NULL)
{
bookdetailwindow->close();
}
if(addbookwindow!=NULL)
{
addbookwindow->close();
}
// widget手动清除内存
if(booksearchwidget!=NULL)
{
delete booksearchwidget;
booksearchwidget=NULL;
}
if(bookborrowinfowidget!=NULL)
{
delete bookborrowinfowidget;
bookborrowinfowidget=NULL;
}
if(usermanagementwidget!=NULL)
{
delete usermanagementwidget;
usermanagementwidget=NULL;
}
if(bookmanagementwidget!=NULL)
{
delete bookmanagementwidget;
bookmanagementwidget=NULL;
}
}
/****************************************************************************/
/******************************** 登录、注册界面相关 ********************************/
/****************************************************************************/
void MainWindow::on_Button_login_clicked()
{
// 登录时，登录和注册按钮失能
ui->Button_login->setDisabled(true);
ui->Button_register->setDisabled(true);
// 登录界面 新建与显示
loginwindowCreateAndShow();
}
void MainWindow::SLOT_loginQuit()
{
delete loginwindow; // 防止内存泄漏和野指针
loginwindow=NULL;
ui->Button_login->setEnabled(true);
ui->Button_register->setEnabled(true);
}
void MainWindow::SLOT_login(bool isUser,QVector<QString> values)
{
QSqlQuery query(db);
if(isUser)
{
query.exec("select * from user where id = '"
+values.at(0)+"' and password = '"+values.at(1)+"';");
}
else
{
query.exec("select * from manager where id = '"
+values.at(0)+"' and password = '"+values.at(1)+"';");
}
if(!query.next()){
QMessageBox::critical(NULL, "Error", "学号或密码错误，请重新输入", QMessageBox::Yes);
}
else
{ //登录成功
//关闭登录界面
loginwindow->close();
/*** 标题界面部分 ***/
// 配置标题界面中的按钮：登录、注册、退出登录
ui->Button_login->setDisabled(true);
ui->Button_login->hide();
ui->Button_register->setDisabled(true);
ui->Button_register->hide();
ui->Button_quitLogin->setEnabled(true);
ui->Button_quitLogin->show();
// 保存用户信息
people->user_Name=query.value("name").toString();
people->user_ID=query.value("id").toString();
people->user_Password=query.value("password").toString();
people->user_Type=isUser?(People::USER):(People::MANAGER);
people->user_canBorrow=(people->user_Type == People::USER)?query.value("canBorrow").toBool():false;
people->booknum=0;//保持为0。当管理员登陆后需要使用时，再赋值使用
/*** 页面以及界面处理 ***/
if(people->user_Type == People::USER)
{
// (图书搜索页面) 恢复初始化
emit Signal_booksearchwidgetClearAndUpdate();
//(借阅情况页面) 新建并显示
bookborrowinfowidgetCreate(); // 新建
bookborrowqueryUpdate(); // 初始化显示
ui->tabWidget->addTab(bookborrowinfowidget,"借阅情况");
}
else if(people->user_Type == People::MANAGER)
{
// (图书搜索页面) 删除
if(booksearchwidget!=NULL)
{
delete booksearchwidget;
booksearchwidget=NULL;
ui->tabWidget->removeTab(0);
}
//（用户管理页面）新建并显示
usermanagementwidgetCreate();
usermanagementUpdate();//（用户管理界面）更新，初始化显示
ui->tabWidget->addTab(usermanagementwidget,"用户管理");
//（书籍管理页面）新建并显示
bookmanagementwidgetCreate();
bookmanagementUpdate();//（书籍管理界面）更新，初始化显示
ui->tabWidget->addTab(bookmanagementwidget,"书籍管理");
}
}
}
void MainWindow::on_Button_register_clicked()
{
if(people->user_Type == People::VISITOR)
{
// （游客）注册时，登录和注册按钮失能
ui->Button_login->setDisabled(true);
ui->Button_register->setDisabled(true);
}
// 注册界面 新建与显示
registerwindowCreateAndShow();
}
void MainWindow::SLOT_registerQuit()
{
delete registerwindow; //防止内存泄漏和野指针
registerwindow=NULL;
ui->Button_login->setEnabled(true);
ui->Button_register->setEnabled(true);
}
void MainWindow::SLOT_register(QVector<QString> values)
{
QSqlQuery query(db);
query.exec("select * from user where id = '"
+values.at(0)+"';");
if(query.next())
{
QMessageBox::critical(NULL, "Error", "这个学号已经被注册，请重新确认", QMessageBox::Yes);
}
else
{
QString queryCommand="insert into user (id , name, password, canBorrow) values('" +
values.at(0) + "','" + values.at(1) + "','" + values.at(2) + "',false);";
query.exec(queryCommand);
QMessageBox::information(NULL, "Info", "id为" + values.at(0) + "的普通用户注册成功", QMessageBox::Yes);
registerwindow->close();
}
if(people->user_Type == People::MANAGER)
{
// 管理员注册用户后，更新（用户管理界面）
usermanagementUpdate();
}
}
void MainWindow::on_Button_quitLogin_clicked()
{
int user_Type_Old=people->user_Type; // 保存退出前的用户性质
// people值恢复成默认值
people->user_Type = People::VISITOR;
people->user_Name = "游客";
people->user_ID="";
people->user_Password="";
people->user_canBorrow=false;
people->booknum=0;
// 按钮配置：(退出登录) 隐藏， (注册)、(登录) 显示
ui->Button_quitLogin->hide();
ui->Button_login->setEnabled(true);
ui->Button_login->show();
ui->Button_register->setEnabled(true);
ui->Button_register->show();
/*** 页面以及界面处理 ***/
if(user_Type_Old == People::USER)
{
// (借阅情况页面) 删除
delete bookborrowinfowidget;
bookborrowinfowidget=NULL;
ui->tabWidget->removeTab(1);
// (图书搜索页面) 删除(需要调用析构函数来删除表中checkbox)
delete booksearchwidget;
booksearchwidget=NULL;
ui->tabWidget->removeTab(0);
}
else if(user_Type_Old == People::MANAGER)
{
// (书籍管理页面) 删除
delete bookmanagementwidget;
bookmanagementwidget = NULL;
ui->tabWidget->removeTab(1);
// 书籍管理页面 的 弹窗 (书籍详细信息界面) 如果未关闭则关闭
if(bookdetailwindow!=NULL)// 判断 (书籍详细信息界面） 是否存在，存在则关闭
{
bookdetailwindow->close();//自动清理
}
// (用户管理页面) 删除
delete usermanagementwidget;
usermanagementwidget=NULL;
ui->tabWidget->removeTab(0);
// 用户管理页面 的 弹窗 (用户详细信息界面) 如果未关闭则关闭
if(userdetailwindow!=NULL)// 判断 (用户详细信息界面） 是否存在，存在则关闭
{
userdetailwindow->close(); // 已经定义相关槽函数，会自动清理
}
}
// （图书搜索页面）新建
booksearchwidgetCreate(); // 新建
bookquerySearchUpdate(); // 刷新显示，默认“所有类型”
ui->tabWidget->addTab(booksearchwidget,"图书搜索");
}
void MainWindow::loginwindowCreateAndShow()
{
loginwindow = new LoginWindow();
loginwindow->setWindowTitle("登录");
loginwindow->show();
connect(loginwindow,SIGNAL(Signal_loginQuit()),this,SLOT(SLOT_loginQuit()));
connect(loginwindow,SIGNAL(Signal_login(bool,QVector<QString>)),this,SLOT(SLOT_login(bool,QVector<QString>)));
}
void MainWindow::registerwindowCreateAndShow()
{
registerwindow = new RegisterWindow();
registerwindow->setWindowTitle("注册");
registerwindow->show();
connect(registerwindow,SIGNAL(Signal_registerQuit()),this,SLOT(SLOT_registerQuit()));
connect(registerwindow,SIGNAL(Signal_register(QVector<QString>)),this,SLOT(SLOT_register(QVector<QString>)));
}
/****************************************************************************/
/******************************** 图书搜索页面相关 ********************************/
/****************************************************************************/
void MainWindow::booksearchwidgetCreate()
{
booksearchwidget = new BookSearchWidget();
connect(booksearchwidget,SIGNAL(Signal_bookquerySearch(BookQuery)),this,SLOT(SLOT_bookquerySearch(BookQuery)));
connect(this,SIGNAL(Signal_bookqueryResult(QVector<Book>,People*)),booksearchwidget,SLOT(SLOT_bookqueryResult(QVector<Book>,People*)));
connect(booksearchwidget,SIGNAL(Signal_bookBorrow(QVector<QString>)),this,SLOT(SLOT_bookBorrow(QVector<QString>)));
connect(this,SIGNAL(Signal_booksearchwidgetClearAndUpdate()),booksearchwidget,SLOT(SLOT_booksearchwidgetClearAndUpdate()));
}
void MainWindow::SLOT_bookquerySearch(BookQuery bookquery)
{
bookquerySearchUpdate(bookquery);
}
void MainWindow::bookquerySearchUpdate(BookQuery bookquery)
{
QVector<Book> Catalog = booksData(bookquery, false);
emit Signal_bookqueryResult(Catalog, people); //返回搜索结果
}
void MainWindow::bookquerySearchUpdate()
{
BookQuery bookquery;
QVector<Book> Catalog = booksData(bookquery, true);
emit Signal_bookqueryResult(Catalog, people); //返回搜索结果
}
QVector<Book> MainWindow::booksData(BookQuery bookquery, bool recover)
{
QSqlQuery query(db);
QString queryCommand;
int flag_firstsatisfy=0;
// 构建数据库命令
if(recover == true)
{
queryCommand="select * from book;";
}
else
{
queryCommand="select * from book";
if(!(bookquery.book_id == "" && bookquery.name == "" && bookquery.author_name == "" &&
bookquery.begin_year == 0 && bookquery.end_year == 0 && bookquery.publisher =="" &&
bookquery.low_price == 0 && bookquery.high_price == 0 && bookquery.have_stock == false &&
bookquery.type == "所有类型"))
{ // 需要筛选
queryCommand += " where ";
if(bookquery.book_id != "")
{
queryCommand += "book_id='"+bookquery.book_id+"'";
flag_firstsatisfy = 1;
}
if(bookquery.name != "")
{
if(flag_firstsatisfy == 0)
{
flag_firstsatisfy=1;
}
else
{
queryCommand += " and ";
}
queryCommand += "name='"+bookquery.name+"'";
}
if(bookquery.author_name != "")
{
if(flag_firstsatisfy == 0)
{
flag_firstsatisfy=1;
}
else
{
queryCommand += " and ";
}
queryCommand += "author_name='"+bookquery.author_name+"'";
}
if(!(bookquery.begin_year == 0 && bookquery.end_year == 0))
{
if(flag_firstsatisfy == 0)
{
flag_firstsatisfy=1;
}
else
{
queryCommand += " and ";
}
queryCommand += "publish_year>="+QString::number(bookquery.begin_year,10)+
" and publish_year<="+QString::number(bookquery.end_year,10);
}
if(bookquery.publisher !="")
{
if(flag_firstsatisfy == 0)
{
flag_firstsatisfy=1;
}
else
{
queryCommand += " and ";
}
queryCommand += "publisher='"+bookquery.publisher+"'";
}
if(!(bookquery.low_price == 0 && bookquery.high_price == 0))
{
if(flag_firstsatisfy == 0)
{
flag_firstsatisfy=1;
}
else
{
queryCommand += " and ";
}
queryCommand += "price>="+QString::number(bookquery.low_price,'f',2)+
" and price<="+QString::number(bookquery.high_price,'f',2);
}
if(bookquery.have_stock != false)
{
if(flag_firstsatisfy == 0)
{
flag_firstsatisfy=1;
}
else
{
queryCommand += " and ";
}
queryCommand += "stock!=0";
}
if(bookquery.type != "所有类型")
{
if(flag_firstsatisfy == 0)
{
flag_firstsatisfy=1;
}
else
{
queryCommand += " and ";
}
queryCommand += "type='"+bookquery.type+"'";
}
}
queryCommand+=";";
}
//执行数据库命令
query.exec(queryCommand);
//存储搜索结果
QVector<Book> Catalog;
Book book;
while(query.next())
{
book.book_id=query.value("book_id").toString();
book.name=query.value("name").toString();
book.author_name=query.value("author_name").toString();
book.price=query.value("price").toDouble();
book.num=query.value("num").toInt();
book.stock=query.value("stock").toInt();
book.publisher=query.value("publisher").toString();
book.publish_year=query.value("publish_year").toString();
book.type=query.value("type").toString();
Catalog.append(book);
}
return Catalog;
}
void MainWindow::SLOT_bookBorrow(QVector<QString> bookborrow)
{
int sucessNum=0,errorNum=0;
int borrowNum=bookborrow.size();
QSqlQuery query(db);
QString queryCommand;
QDate dateBorrow = QDate::currentDate();//.toString("yyyy-MM-dd")
QDate dateReturn = dateBorrow.addDays(+30);//默认借30天,此外，获取剩余时间的方法：dateBorrow.daysTo(dateReturn);
if(borrowNum>0)
{
if(people->user_canBorrow==true)
{
for (int i = 0; i < borrowNum; i++)
{
queryCommand="insert into borrow (user_id, book_id, borrow_date, return_date) value ('"+
people->user_ID+"', '"+bookborrow[i]+"', '"+dateBorrow.toString("yyyy-MM-dd")+"', '"+
dateReturn.toString("yyyy-MM-dd")+"');";
if(query.exec(queryCommand) == true)
{
//更新book中的剩余量
queryCommand="select stock from book where book_id='"+bookborrow[i]+"';";
query.exec(queryCommand);
if(query.next())
{
int stock=query.value("stock").toInt();
stock-=1;
queryCommand="update book set stock="+QString::number(stock,10)+" where book_id='"+bookborrow[i]+"';";
if(query.exec(queryCommand))
{
sucessNum++;
}
else
{
errorNum++;
}
}
else
{
errorNum++;
}
}
else
{
errorNum++;
}
}
QMessageBox::information(NULL, "Info", "您借阅成功"+QString::number(sucessNum,10)+"本，借阅失败"+QString::number(errorNum,10)+"本", QMessageBox::Yes);
//借书后，更新图书检索页面
emit Signal_booksearchwidgetClearAndUpdate();
//借书后，更新借阅情况页面
bookborrowqueryUpdate();
}
else
{
QMessageBox::critical(NULL, "Info", "您没有借书权限，请联系管理员开启", QMessageBox::Yes);
}
}
else
{
QMessageBox::critical(NULL, "Info", "您尚未选择任何书籍", QMessageBox::Yes);
}
}
/****************************************************************************/
/******************************** 借阅情况页面相关 ********************************/
/****************************************************************************/
void MainWindow::bookborrowinfowidgetCreate()
{
bookborrowinfowidget = new BookBorrowInfoWidget();
connect(this,SIGNAL(Signal_bookborrowqueryResult(QVector<BorrowBook>,People*)),bookborrowinfowidget,SLOT(SLOT_bookborrowqueryResult(QVector<BorrowBook>,People*)));
connect(bookborrowinfowidget,SIGNAL(Signal_bookReturn(QVector<QString>)),this,SLOT(SLOT_bookReturn(QVector<QString>)));
}
void MainWindow::bookborrowqueryUpdate()
{
QSqlQuery query(db);
QString queryCommand;
if(people->user_Type == People::USER)
{
queryCommand="select * from borrow where user_id='" + people->user_ID +"';";
query.exec(queryCommand);
QVector<BorrowBook> Catalog;
BorrowBook borrowbook;
while(query.next())
{
borrowbook.userID=query.value("user_id").toString();
borrowbook.book.book_id=query.value("book_id").toString();
borrowbook.dateBorrow=query.value("borrow_date").toString();
borrowbook.dateReturn=query.value("return_date").toString();
Catalog.append(borrowbook);
}
for(int i=0;i<Catalog.size();i++)
{//继续完善Catalog
queryCommand="select * from book where book_id='" + Catalog[i].book.book_id +"';";
query.exec(queryCommand);
if(query.next())
{
Catalog[i].book.name=query.value("name").toString();
Catalog[i].book.author_name=query.value("author_name").toString();
Catalog[i].book.price=query.value("price").toDouble();
Catalog[i].book.num=query.value("num").toInt();
Catalog[i].book.stock=query.value("stock").toInt();
Catalog[i].book.publisher=query.value("publisher").toString();
Catalog[i].book.publish_year=query.value("publish_year").toString();
Catalog[i].book.type=query.value("type").toString();
}
}
emit Signal_bookborrowqueryResult(Catalog,people);
}
}
void MainWindow::SLOT_bookReturn(QVector<QString> bookreturn)
{
int sucessNum=0,errorNum=0;
int returnNum=bookreturn.size();
QSqlQuery query(db);
if(returnNum>0)
{
for (int i = 0; i < returnNum; i++)
{
QString queryCommand="delete from borrow where user_id='"+people->user_ID+"' and book_id='"+
bookreturn[i]+"';";
if(query.exec(queryCommand) == true)
{
//更新book中的剩余量
queryCommand="select stock from book where book_id='"+bookreturn[i]+"';";
query.exec(queryCommand);
if(query.next())
{
int stock=query.value("stock").toInt();
stock+=1;
queryCommand="update book set stock="+QString::number(stock,10)+" where book_id='"+bookreturn[i]+"';";
if(query.exec(queryCommand))
{
sucessNum++;
}
else
{
errorNum++;
}
}
else
{
errorNum++;
}
}
else
{
errorNum++;
}
}
QMessageBox::information(NULL, "Info", "您归还成功"+QString::number(sucessNum,10)+"本，归还失败"+QString::number(errorNum,10)+"本", QMessageBox::Yes);
}
else
{
QMessageBox::critical(NULL, "Error", "您尚未选择任何书籍", QMessageBox::Yes);
}
//还书后，更新图书检索页面
emit Signal_booksearchwidgetClearAndUpdate();// 释放信号，（图书搜索界面）整个界面恢复初始化
//还书后，更新借阅情况页面
bookborrowqueryUpdate();
}
/****************************************************************************/
/******************************** 用户管理页面相关 ********************************/
/****************************************************************************/
void MainWindow::usermanagementwidgetCreate()
{
usermanagementwidget=new UserManagementWidget();
connect(this,SIGNAL(Signal_usermanagementResult(QVector<People>)),usermanagementwidget,SLOT(SLOT_usermanagementResult(QVector<People>)));
connect(usermanagementwidget,SIGNAL(Signal_SearchUserDetailInfo(QString)),this,SLOT(SLOT_SearchUserDetailInfo(QString)));
connect(this,SIGNAL(Signal_enableButton_SearchUserDetail()),usermanagementwidget,SLOT(SLOT_enableButton_SearchUserDetail()));
connect(this,SIGNAL(Signal_disableButton_SearchUserDetail()),usermanagementwidget,SLOT(SLOT_disableButton_SearchUserDetail()));
connect(usermanagementwidget,SIGNAL(Signal_changeUserPri(QVector<QString>)),this,SLOT(SLOT_changeUserPri(QVector<QString>)));
connect(usermanagementwidget,SIGNAL(Signal_deleteUser(QVector<QString>)),this,SLOT(SLOT_deleteUser(QVector<QString>)));
connect(usermanagementwidget,SIGNAL(Signal_addUser()),this,SLOT(on_Button_register_clicked()));
}
void MainWindow::usermanagementUpdate()
{
QSqlQuery query(db);
QSqlQuery query0(db);
QString queryCommand;
if(people->user_Type == People::MANAGER)
{
queryCommand="select * from user;";
query.exec(queryCommand);
QVector<People> Catalog;
People user;
while(query.next())
{
user.user_Name=query.value("name").toString();
user.user_ID=query.value("id").toString();
user.user_Password=query.value("password").toString();
user.user_Type=People::USER;
user.user_canBorrow=query.value("canBorrow").toBool();
//获取借阅数
queryCommand="select * from borrow where user_id='"+user.user_ID+"';";
query0.exec(queryCommand);
user.booknum=query0.size();
Catalog.append(user);
}
emit Signal_usermanagementResult(Catalog);
}
}
void MainWindow::SLOT_userdetailwindowClosed()
{
userdetailwindowClosed();
}
void MainWindow::userdetailwindowClosed()
{
userdetailwindow->close();
delete userdetailwindow; //防止内存泄漏和野指针
userdetailwindow=NULL;
emit Signal_enableButton_SearchUserDetail();
}
void MainWindow::SLOT_SearchUserDetailInfo(QString userID)
{
//查询信息
QSqlQuery query(db);
QSqlQuery query0(db);
QString queryCommand;
UserDetial userdetial;
BorrowBook borrowbook;
if(people->user_Type == People::MANAGER)
{
queryCommand="select * from user where id='"+userID+"';";
query.exec(queryCommand);
if(query.next())
{
//(用户详细信息界面)，显示出来
userdetailwindow = new UserDetailWindow();
userdetailwindow->setWindowTitle("用户详细信息");
userdetailwindow->show();
connect(userdetailwindow,SIGNAL(Signal_userdetailwindowClosed()),this,SLOT(SLOT_userdetailwindowClosed()));
connect(this,SIGNAL(Signal_SearchUserDetailUpdate(UserDetial)),userdetailwindow,SLOT(SLOT_SearchUserDetailUpdate(UserDetial)));
connect(userdetailwindow,SIGNAL(Signal_changeUserInfo(UserDetial)),this,SLOT(SLOT_changeUserInfo(UserDetial)));
connect(this,SIGNAL(Signal_OnlyUserDetailUpdate(UserDetial)),userdetailwindow,SLOT(SLOT_OnlyUserDetailUpdate(UserDetial)));
connect(userdetailwindow,SIGNAL(Signal_deleteUser(UserDetial)),this,SLOT(SLOT_deleteUser(UserDetial)));
userdetial.user.user_Name=query.value("name").toString();
userdetial.user.user_ID=query.value("id").toString();
userdetial.user.user_Password=query.value("password").toString();
userdetial.user.user_canBorrow=query.value("canBorrow").toBool();
//获取借阅数
queryCommand="select book_id from borrow where user_id='"+userdetial.user.user_ID+"';";
query.exec(queryCommand);
userdetial.user.booknum=query.size();
//继续查询借阅书本信息
while(query.next())
{
borrowbook.book.book_id = query.value("book_id").toString();
queryCommand="select * from book where book_id='" + borrowbook.book.book_id +"';";
query0.exec(queryCommand);
if(query0.next())
{
borrowbook.book.name=query0.value("name").toString();
}
queryCommand="select * from borrow where user_id='" + userdetial.user.user_ID +
"' and book_id='"+borrowbook.book.book_id+"';";
query0.exec(queryCommand);
if(query0.next())
{
borrowbook.dateBorrow=query0.value("borrow_date").toString();
borrowbook.dateReturn=query0.value("return_date").toString();
}
userdetial.borrowbook.append(borrowbook);
}
emit Signal_SearchUserDetailUpdate(userdetial);
emit Signal_disableButton_SearchUserDetail();
}
else
{
QMessageBox::critical(NULL, "Error", "查询失败，可能没有该用户", QMessageBox::Yes);
}
}
}
void MainWindow::SLOT_changeUserInfo(UserDetial userdetialOld)
{
QSqlQuery query(db);
QString queryCommand;
if(people->user_Type == People::MANAGER)
{
//更新数据库
queryCommand = QString("update user set name='%1', password='%2', canBorrow=%3 where id='%4';").arg(userdetialOld.user.user_Name, userdetialOld.user.user_Password,userdetialOld.user.user_canBorrow?"true":"false", userdetialOld.user.user_ID);
query.exec(queryCommand);
//从数据中读取新的值
queryCommand = QString("select name,password,canBorrow from user where id='%1';").arg(userdetialOld.user.user_ID);
query.exec(queryCommand);
if(query.next())
{
userdetialOld.user.user_Name=query.value("name").toString();
userdetialOld.user.user_Password=query.value("password").toString();
userdetialOld.user.user_canBorrow=query.value("canBorrow").toBool();
emit Signal_OnlyUserDetailUpdate(userdetialOld);
usermanagementUpdate();
if(bookdetailwindow!=NULL)
{
bookdetailwindow->close();
}
QMessageBox::information(NULL, "Info", "用户信息已更新", QMessageBox::Yes);
}
}
}
void MainWindow::SLOT_deleteUser(UserDetial userdetialNow)
{
QSqlQuery query(db);
QString queryCommand;
if(people->user_Type == People::MANAGER)
{
//删除用户需要用户借阅数量为0
queryCommand="select * from borrow where user_id='"+userdetialNow.user.user_ID+"';";
query.exec(queryCommand);
if(query.size()!=0)
{
QMessageBox::critical(NULL, "Error", "用户有借阅，不能删除", QMessageBox::Yes);
}
else
{
queryCommand = QString("delete from user where id='%1';").arg(userdetialNow.user.user_ID);
query.exec(queryCommand);
userdetailwindowClosed();
usermanagementUpdate();
QMessageBox::information(NULL, "Info", "用户删除成功", QMessageBox::Yes);
}
}
}
void MainWindow::SLOT_changeUserPri(QVector<QString> changepriuser)
{
int changeNum=changepriuser.size();
QSqlQuery query(db);
QString queryCommand;
bool changeuserPri=false;
if(changeNum > 0)
{
for (int i = 0; i < changeNum; i++)
{
queryCommand = QString("select canBorrow from user where id='%1';").arg(changepriuser[i]);
query.exec(queryCommand);
if(query.next())
{
changeuserPri=query.value("canBorrow").toBool();
}
queryCommand = QString("update user set canBorrow=%1 where id='%2';").arg(changeuserPri?"false":"true", changepriuser[i]);
query.exec(queryCommand);
}
}
else
{
QMessageBox::critical(NULL, "Error", "请正确选择需要修改的用户", QMessageBox::Yes);
}
//更改后，判断是否有打开了(用户详细信息界面)。若打开则关闭
if(userdetailwindow!=NULL)
{
userdetailwindow->close();
delete userdetailwindow;
userdetailwindow=NULL;
}
// 更改后，更新（用户管理界面）
usermanagementUpdate();
}
void MainWindow::SLOT_deleteUser(QVector<QString> deleteuser)
{
int sucessNum=0;
int deleteNum=deleteuser.size();
QSqlQuery query(db);
QString queryCommand;
if(deleteNum > 0)
{
for (int i = 0; i < deleteNum; i++)
{
queryCommand = QString("delete from user where id='%1';").arg(deleteuser[i]);
if(query.exec(queryCommand) == true)
{
sucessNum++;
}
}
if(sucessNum > 0)
{
QMessageBox::information(NULL, "Info", "成功删除"+QString::number(sucessNum,10)+"名用户", QMessageBox::Yes);
}
}
else
{
QMessageBox::critical(NULL, "Error", "请正确选择需要修改的用户", QMessageBox::Yes);
}
//更改后，判断是否有打开了(用户详细信息界面)。若打开则关闭
if(userdetailwindow!=NULL)
{
userdetailwindow->close();
delete userdetailwindow;
userdetailwindow=NULL;
}
// 更改后，更新（用户管理界面）
usermanagementUpdate();
}
/****************************************************************************/
/******************************** 书籍管理页面相关 ********************************/
/****************************************************************************/
void MainWindow::bookmanagementwidgetCreate()
{
bookmanagementwidget = new BookManagementWidget();
connect(this,SIGNAL(Signal_bookmanagementResult(QVector<Book>)),bookmanagementwidget,SLOT(SLOT_bookmanagementResult(QVector<Book>)));
connect(bookmanagementwidget,SIGNAL(Signal_SearchBookDetailInfo(QString)),this,SLOT(SLOT_SearchBookDetailInfo(QString)));
connect(this,SIGNAL(Signal_enableButton_SearchBookDetail()),bookmanagementwidget,SLOT(SLOT_enableButton_SearchBookDetail()));
connect(this,SIGNAL(Signal_disableButton_SearchBookDetail()),bookmanagementwidget,SLOT(SLOT_disableButton_SearchBookDetail()));
connect(bookmanagementwidget,SIGNAL(Signal_deleteBook(QVector<QString>)),this,SLOT(SLOT_deleteBook(QVector<QString>)));
connect(bookmanagementwidget,SIGNAL(Signal_addBook()),this,SLOT(SLOT_addBook()));
connect(this,SIGNAL(Signal_enableButton_addBook()),bookmanagementwidget,SLOT(SLOT_enableButton_addBook()));
connect(this,SIGNAL(Signal_disableButton_addBook()),bookmanagementwidget,SLOT(SLOT_disableButton_addBook()));
}
void MainWindow::bookmanagementUpdate()
{
BookQuery bookquery;
QVector<Book> Catalog = booksData(bookquery, true);
emit Signal_bookmanagementResult(Catalog);
}
void MainWindow::SLOT_SearchBookDetailInfo(QString bookID)
{
QSqlQuery query(db);
QSqlQuery query0(db);
QString queryCommand;
BookDetial bookdetial;
BorrowUser borrowuser;
if(people->user_Type == People::MANAGER)
{
queryCommand="select * from book where book_id='"+bookID+"';";
query.exec(queryCommand);
if(query.next())
{
//(书籍详细信息界面)，显示出来
bookdetailwindow = new BookDetailWindow();
bookdetailwindow->setWindowTitle("书籍详细信息");
bookdetailwindow->show();
connect(bookdetailwindow,SIGNAL(Signal_bookdetailwindowClosed()),this,SLOT(SLOT_bookdetailwindowClosed()));
connect(this,SIGNAL(Signal_SearchBookDetailUpdate(BookDetial)),bookdetailwindow,SLOT(SLOT_SearchBookDetailUpdate(BookDetial)));
connect(bookdetailwindow,SIGNAL(Signal_changeBookInfo(BookDetial)),this,SLOT(SLOT_changeBookInfo(BookDetial)));
connect(this,SIGNAL(Signal_OnlyBookDetailUpdate(BookDetial)),bookdetailwindow,SLOT(SLOT_OnlyBookDetailUpdate(BookDetial)));
connect(bookdetailwindow,SIGNAL(Signal_deleteBook(BookDetial)),this,SLOT(SLOT_deleteBook(BookDetial)));
bookdetial.book.book_id = query.value("book_id").toString();
bookdetial.book.name=query.value("name").toString();
bookdetial.book.author_name=query.value("author_name").toString();
bookdetial.book.price=query.value("price").toDouble();
bookdetial.book.num=query.value("num").toInt();
bookdetial.book.stock=query.value("stock").toInt();
bookdetial.book.publisher=query.value("publisher").toString();
bookdetial.book.publish_year=query.value("publish_year").toString();
bookdetial.book.type=query.value("type").toString();
//获取借阅人员
queryCommand="select * from borrow where book_id='"+bookdetial.book.book_id+"';";
query.exec(queryCommand);
//继续查询借阅人员信息
while(query.next())
{
borrowuser.user.user_ID = query.value("user_id").toString();
borrowuser.dateBorrow = query.value("borrow_date").toString();
borrowuser.dateReturn = query.value("return_date").toString();
queryCommand="select name from user where id='" + borrowuser.user.user_ID +"';";
query0.exec(queryCommand);
if(query0.next())
{
borrowuser.user.user_Name = query0.value("name").toString();
}
bookdetial.user.append(borrowuser);
}
emit Signal_SearchBookDetailUpdate(bookdetial);
emit Signal_disableButton_SearchBookDetail();
//关闭（书籍添加页面）。判断
if(addbookwindow!=NULL)
{
addbookwindow->close();
}
}
else
{
QMessageBox::critical(NULL, "Error", "查询失败，可能没有该书籍", QMessageBox::Yes);
}
}
}
void MainWindow::SLOT_bookdetailwindowClosed()
{
bookdetailwindowClosed();
}
void MainWindow::bookdetailwindowClosed()
{
bookdetailwindow->close();
delete bookdetailwindow; //防止内存泄漏和野指针
bookdetailwindow=NULL;
emit Signal_enableButton_SearchBookDetail();
}
void MainWindow:: SLOT_changeBookInfo(BookDetial bookdetialOld)
{
QSqlQuery query(db);
QString queryCommand;
if(people->user_Type == People::MANAGER)
{
//更新数据库
queryCommand = QString("update book set name='%1', author_name='%2', price=%3, num=%4, stock=%5, publisher='%6', publish_year='%7', type='%8' where book_id='%9';").arg(bookdetialOld.book.name, bookdetialOld.book.author_name, QString::number(bookdetialOld.book.price, 'f', 2), QString::number(bookdetialOld.book.num, 10), QString::number(bookdetialOld.book.stock, 10), bookdetialOld.book.publisher, bookdetialOld.book.publish_year, bookdetialOld.book.type, bookdetialOld.book.book_id);
query.exec(queryCommand);
//从数据中读取新的值
queryCommand = QString("select * from book where book_id='%1';").arg(bookdetialOld.book.book_id);
query.exec(queryCommand);
if(query.next())
{
bookdetialOld.book.name=query.value("name").toString();
bookdetialOld.book.author_name=query.value("author_name").toString();
bookdetialOld.book.price=query.value("price").toDouble();
bookdetialOld.book.num=query.value("num").toInt();
bookdetialOld.book.stock=query.value("stock").toInt();
bookdetialOld.book.publisher=query.value("publisher").toString();
bookdetialOld.book.publish_year=query.value("publish_year").toString();
bookdetialOld.book.type=query.value("type").toString();
emit Signal_OnlyBookDetailUpdate(bookdetialOld);
bookmanagementUpdate();
if(userdetailwindow!=NULL)
{
userdetailwindow->close();
}
QMessageBox::information(NULL, "Info", "书籍信息已更新", QMessageBox::Yes);
}
}
}
void MainWindow::SLOT_deleteBook(BookDetial bookdetialNow)
{
QSqlQuery query(db);
QString queryCommand;
if(people->user_Type == People::MANAGER)
{
//删除用户需要用户借阅数量为0
queryCommand="select * from borrow where book_id='"+bookdetialNow.book.book_id+"';";
query.exec(queryCommand);
if(query.size()!=0)
{
QMessageBox::critical(NULL, "Error", "用户有借阅，不能删除", QMessageBox::Yes);
}
else
{
queryCommand = QString("delete from book where book_id='%1';").arg(bookdetialNow.book.book_id);
query.exec(queryCommand);
bookdetailwindowClosed();
bookmanagementUpdate();
QMessageBox::information(NULL, "Info", "书籍删除成功", QMessageBox::Yes);
}
}
}
void MainWindow::SLOT_addBook()
{
if(people->user_Type == People::MANAGER)
{
//显示（注册界面）
addbookwindow = new AddBookWindow();
addbookwindow->setWindowTitle("书籍添加/更新界面");
addbookwindow->show();
connect(addbookwindow,SIGNAL(Signal_addbookwindowClosed()),this,SLOT(SLOT_addbookwindowClosed()));
connect(addbookwindow,SIGNAL(Signal_addOneBook(Book)),this,SLOT(SLOT_addOneBook(Book)));
connect(addbookwindow,SIGNAL(Signal_addSomeBooks(QVector<Book>)),this,SLOT(SLOT_addSomeBooks(QVector<Book>)));
emit Signal_disableButton_addBook();
//关闭（书籍详细信息页面）。判断
if(bookdetailwindow!=NULL)
{
bookdetailwindow->close();
}
}
}
void MainWindow::SLOT_addbookwindowClosed()
{
addbookwindowClosed();
}
void MainWindow::addbookwindowClosed()
{
addbookwindow->close();
delete addbookwindow; //防止内存泄漏和野指针
addbookwindow=NULL;
emit Signal_enableButton_addBook();
}
void MainWindow::SLOT_deleteBook(QVector<QString> deletebook)
{
int sucessNum=0;
int deleteNum=deletebook.size();
QSqlQuery query(db);
QString queryCommand;
if(deleteNum > 0)
{
for (int i = 0; i < deleteNum; i++)
{
queryCommand = QString("delete from book where book_id='%1';").arg(deletebook[i]);
if(query.exec(queryCommand) == true)
{
sucessNum++;
}
}
if(sucessNum > 0)
{
QMessageBox::information(NULL, "Info", "成功删除"+QString::number(sucessNum,10)+"本书籍", QMessageBox::Yes);
}
}
else
{
QMessageBox::critical(NULL, "Error", "请正确选择需要修改的用户", QMessageBox::Yes);
}
//更改后，判断是否有打开了(书籍详细信息界面)。若打开则关闭
if(bookdetailwindow!=NULL)
{
bookdetailwindow->close();//自动回收
}
// 更改后，更新（书籍管理界面）
bookmanagementUpdate();
}
void MainWindow::SLOT_addOneBook(Book addbook)
{
if(people->user_Type == People::MANAGER)
{
QSqlQuery query(db);
QString queryCommand;
queryCommand="select * from book where book_id='"+addbook.book_id+"';";
query.exec(queryCommand);
if(query.size()!=0)
{
//已经存在，更新
if(addbook.num < (query.value("num").toInt() - query.value("stock").toInt()))//更新后的数量小于借出量时，不进行更新
{
QMessageBox::critical(NULL, "Error", "请修改书籍数量大于借出量："+QString::number((query.value("num").toInt() - query.value("stock").toInt()),10), QMessageBox::Yes);
return ;
}
queryCommand=QString("update book set name='%1', author_name='%2', price=%3, num=%4, stock=%5, publisher='%6', publish_year='%7', type='%8' where book_id='%9'").arg(addbook.name, addbook.author_name, QString::number(addbook.price,'f',2), QString::number(addbook.num,10), QString::number(addbook.stock,10), addbook.publisher, addbook.publish_year, addbook.type, addbook.book_id);
query.exec(queryCommand);
}
else
{
//新书，添加
queryCommand=QString("insert into book (book_id, name, author_name, price, num, stock, publisher, publish_year, type) values ('%1', '%2', '%3', %4, %5, %6, '%7', '%8', '%9');").arg(addbook.book_id, addbook.name, addbook.author_name, QString::number(addbook.price,'f',2), QString::number(addbook.num,10), QString::number(addbook.stock,10), addbook.publisher, addbook.publish_year, addbook.type);
query.exec(queryCommand);
}
bookmanagementUpdate();
if(userdetailwindow!=NULL)
{
userdetailwindow->close();
}
if(bookdetailwindow!=NULL)
{
userdetailwindow->close();
}
QMessageBox::information(NULL, "Info", "成功添加/更新书籍", QMessageBox::Yes);
}
}
void MainWindow::SLOT_addSomeBooks(QVector<Book> addbooks)
{
if(people->user_Type == People::MANAGER)
{
QSqlQuery query(db);
QString queryCommand;
int addSucess=0;
int updateSucess=0;
int addNum=addbooks.size();
for(int i=0;i<addNum;i++)
{
queryCommand="select * from book where book_id='"+addbooks[i].book_id+"';";
query.exec(queryCommand);
if(query.size()!=0)
{
//已经存在，更新
if(addbooks[i].num < (query.value("num").toInt() - query.value("stock").toInt()))//更新后的数量小于借出量时，不进行更新
{
QMessageBox::critical(NULL, "Error", "请修改书籍数量大于借出量："+QString::number((query.value("num").toInt() - query.value("stock").toInt()),10), QMessageBox::Yes);
return ;
}
queryCommand=QString("update book set name='%1', author_name='%2', price=%3, num=%4, stock=%5, publisher='%6', publish_year='%7', type='%8' where book_id='%9'").arg(addbooks[i].name, addbooks[i].author_name, QString::number(addbooks[i].price,'f',2), QString::number(addbooks[i].num,10), QString::number(addbooks[i].stock,10), addbooks[i].publisher, addbooks[i].publish_year, addbooks[i].type, addbooks[i].book_id);
query.exec(queryCommand);
updateSucess++;
}
else
{
//新书，添加
queryCommand=QString("insert into book (book_id, name, author_name, price, num, stock, publisher, publish_year, type) values ('%1', '%2', '%3', %4, %5, %6, '%7', '%8', '%9');").arg(addbooks[i].book_id, addbooks[i].name, addbooks[i].author_name, QString::number(addbooks[i].price,'f',2), QString::number(addbooks[i].num,10), QString::number(addbooks[i].stock,10), addbooks[i].publisher, addbooks[i].publish_year, addbooks[i].type);
query.exec(queryCommand);
addSucess++;
}
}
bookmanagementUpdate();
if(userdetailwindow!=NULL)
{
userdetailwindow->close();
}
QMessageBox::information(NULL, "Info", "成功添加书籍"+QString::number(addSucess,10)+"本、更新"+QString::number(updateSucess,10)+"本", QMessageBox::Yes);
}
}
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