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PyQt5搭建图书馆管理系统(8)——借书/还书功能

借书功能实现#

分析#

本来借书的信息都是应该有RFID识别得到的,但是作为大作业,只能让用户输入信息了,但是书名之类的都不唯一,所以采取了与淘汰书籍一样的操作——让用户输入书号,自动匹配书本信息,然后确认借阅

借阅时,需要处理的逻辑如下:

  • 用户输入的书号存在,就匹配信息给用户
  • 不存在就点击借阅,给出警告
  • 借阅书籍数已经达到上限5本 ,给出警告
  • 不允许借阅同样的书
  • 更新Book表信息的借阅次数,剩余可借阅书数
  • User_Book表插入记录
  • 借阅成功给出提示

代码实现#

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import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import qdarkstyle
import time
from PyQt5.QtSql import *


class borrowBookDialog(QDialog):
borrow_book_success_signal = pyqtSignal()

def __init__(self, StudentId, parent=None):
super(borrowBookDialog, self).__init__(parent)
self.studentId = StudentId
self.setUpUI()
self.setWindowModality(Qt.WindowModal)
self.setWindowTitle("借阅书籍")

def setUpUI(self):
# 书名,书号,作者,分类,添加数量.出版社,出版日期
# 书籍分类:哲学类、社会科学类、政治类、法律类、军事类、经济类、文化类、教育类、体育类、语言文字类、艺术类、历史类、地理类、天文学类、生物学类、医学卫生类、农业类
BookCategory = ["哲学", "社会科学", "政治", "法律", "军事", "经济", "文化", "教育", "体育", "语言文字", "艺术", "历史"
, "地理", "天文学", "生物学", "医学卫生", "农业"]
self.resize(300, 400)
self.layout = QFormLayout()
self.setLayout(self.layout)

# Label控件
self.borrowStudentLabel = QLabel("借 阅 人:")
self.borrowStudentIdLabel = QLabel(self.studentId)
self.titlelabel = QLabel(" 借阅书籍")
self.bookNameLabel = QLabel("书 名:")
self.bookIdLabel = QLabel("书 号:")
self.authNameLabel = QLabel("作 者:")
self.categoryLabel = QLabel("分 类:")
self.publisherLabel = QLabel("出 版 社:")
self.publishDateLabel = QLabel("出版日期:")

# button控件
self.borrowBookButton = QPushButton("确认借阅")

# lineEdit控件
self.bookNameEdit = QLineEdit()
self.bookIdEdit = QLineEdit()
self.authNameEdit = QLineEdit()
self.categoryComboBox = QComboBox()
self.categoryComboBox.addItems(BookCategory)
self.publisherEdit = QLineEdit()
self.publishTime = QLineEdit()

self.bookNameEdit.setMaxLength(10)
self.bookIdEdit.setMaxLength(6)
self.authNameEdit.setMaxLength(10)
self.publisherEdit.setMaxLength(10)

# 添加进formlayout
self.layout.addRow("", self.titlelabel)
self.layout.addRow(self.borrowStudentLabel, self.borrowStudentIdLabel)
self.layout.addRow(self.bookNameLabel, self.bookNameEdit)
self.layout.addRow(self.bookIdLabel, self.bookIdEdit)
self.layout.addRow(self.authNameLabel, self.authNameEdit)
self.layout.addRow(self.categoryLabel, self.categoryComboBox)
self.layout.addRow(self.publisherLabel, self.publisherEdit)
self.layout.addRow(self.publishDateLabel, self.publishTime)
self.layout.addRow("", self.borrowBookButton)

# 设置字体
font = QFont()
font.setPixelSize(20)
self.titlelabel.setFont(font)
font.setPixelSize(16)
self.borrowStudentIdLabel.setFont(font)
font.setPixelSize(14)
self.borrowStudentLabel.setFont(font)
self.bookNameLabel.setFont(font)
self.bookIdLabel.setFont(font)
self.authNameLabel.setFont(font)
self.categoryLabel.setFont(font)
self.publisherLabel.setFont(font)
self.publishDateLabel.setFont(font)

self.bookNameEdit.setFont(font)
self.bookNameEdit.setReadOnly(True)
self.bookNameEdit.setStyleSheet("background-color:#363636")
self.bookIdEdit.setFont(font)
self.authNameEdit.setFont(font)
self.authNameEdit.setReadOnly(True)
self.authNameEdit.setStyleSheet("background-color:#363636")
self.publisherEdit.setFont(font)
self.publisherEdit.setReadOnly(True)
self.publisherEdit.setStyleSheet("background-color:#363636")
self.publishTime.setFont(font)
self.publishTime.setStyleSheet("background-color:#363636")
self.categoryComboBox.setFont(font)
self.categoryComboBox.setStyleSheet("background-color:#363636")

# button设置
font.setPixelSize(16)
self.borrowBookButton.setFont(font)
self.borrowBookButton.setFixedHeight(32)
self.borrowBookButton.setFixedWidth(140)

# 设置间距
self.titlelabel.setMargin(8)
self.layout.setVerticalSpacing(10)
self.borrowBookButton.clicked.connect(self.borrowButtonClicked)
self.bookIdEdit.textChanged.connect(self.bookIdEditChanged)
self.bookIdEdit.returnPressed.connect(self.borrowButtonClicked)

def borrowButtonClicked(self):
# 获取书号,书号为空或不存在库中,则弹出错误
# 向Book_User表插入记录,更新User表以及Book表
BookId = self.bookIdEdit.text()
# BookId为空的处理
if (BookId == ""):
print(QMessageBox.warning(self, "警告", "你所要借的书不存在,请查看输入", QMessageBox.Yes, QMessageBox.Yes))
return
# 打开数据库
db = db = QSqlDatabase.addDatabase("QSQLITE")
db.setDatabaseName('./db/LibraryManagement.db')
db.open()
query = QSqlQuery()
# 如果BookId不存在
sql = "SELECT * FROM Book WHERE BookId='%s'" % BookId
query.exec_(sql)
if (not query.next()):
print(QMessageBox.warning(self, "警告", "你所要借的书不存在,请查看输入", QMessageBox.Yes, QMessageBox.Yes))
return

# 借书上限5本
sql = "SELECT COUNT(StudentId) FROM User_Book WHERE StudentId='%s' AND BorrowState=1" % (
self.studentId)
query.exec_(sql)
if (query.next()):
borrowNum = query.value(0)
if (borrowNum == 5):
QMessageBox.warning(self, "警告", "您借阅的书达到上限(5本),借书失败!", QMessageBox.Yes, QMessageBox.Yes)
return
# 不允许重复借书
sql = "SELECT COUNT(StudentId) FROM User_Book WHERE StudentId='%s' AND BookId='%s' AND BorrowState=1" % (
self.studentId, BookId)
query.exec_(sql)
if (query.next() and query.value(0)):
QMessageBox.warning(self, "警告", "您已经借阅了本书并尚未归还,借阅失败!", QMessageBox.Yes, QMessageBox.Yes)
return
# 更新User表
sql = "UPDATE User SET TimesBorrowed=TimesBorrowed+1,NumBorrowed=NumBorrowed+1 WHERE StudentId='%s'" % self.studentId
query.exec_(sql)
db.commit()
# 更新Book表
sql = "UPDATE Book SET NumCanBorrow=NumCanBorrow-1,NumBorrowed=NumBorrowed+1 WHERE BookId='%s'" % BookId
query.exec_(sql)
db.commit()
# 插入User_Book表
timenow = time.strftime('%Y-%m-%d', time.localtime(time.time()))
sql = "INSERT INTO User_Book VALUES ('%s','%s','%s',NULL,1)" % (self.studentId, BookId, timenow)
print(sql)
query.exec_(sql)
db.commit()
print(QMessageBox.information(self, "提示", "借阅成功!", QMessageBox.Yes, QMessageBox.Yes))
self.borrow_book_success_signal.emit()
self.close()
return

def bookIdEditChanged(self):
bookId = self.bookIdEdit.text()
if (bookId == ""):
self.bookNameEdit.clear()
self.publisherEdit.clear()
self.authNameEdit.clear()
self.publishTime.clear()
db = QSqlDatabase.addDatabase("QSQLITE")
db.setDatabaseName('./db/LibraryManagement.db')
db.open()
query = QSqlQuery()
sql = "SELECT * FROM Book WHERE BookId='%s'" % (bookId)
query.exec_(sql)
# 查询对应书号,如果存在就更新form
if (query.next()):
self.bookNameEdit.setText(query.value(0))
self.authNameEdit.setText(query.value(2))
self.categoryComboBox.setCurrentText(query.value(3))
self.publisherEdit.setText(query.value(4))
self.publishTime.setText(query.value(5))
return


if __name__ == "__main__":
app = QApplication(sys.argv)
app.setWindowIcon(QIcon("./images/MainWindow_1.png"))
app.setStyleSheet(qdarkstyle.load_stylesheet_pyqt5())
mainMindow = borrowBookDialog("PB15000135")
mainMindow.show()
sys.exit(app.exec_())

实现效果#

这里写图片描述
这里写图片描述
这里写图片描述

归还书籍功能实现#

分析#

一开始的时候被借书功能带偏了,依旧使用了让用户输入书号的方式,但其实使用QComboBox列出已借阅图书让用户选择更好,大家可以自己试试

实现逻辑如下:

  • 如果存在借阅记录,就自动匹配书籍信息
  • 如果输入为空,给出警告
  • 并未借阅,给出提示
  • 更新User表,Book表以及User_Book

实现代码#

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import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import qdarkstyle
import time
from PyQt5.QtSql import *


class returnBookDialog(QDialog):
return_book_success_signal=pyqtSignal()
def __init__(self, StudentId, parent=None):
super(returnBookDialog, self).__init__(parent)
self.studentId = StudentId
self.setUpUI()
self.setWindowModality(Qt.WindowModal)
self.setWindowTitle("归还书籍")

def setUpUI(self):
# 书名,书号,作者,分类,添加数量.出版社,出版日期
# 书籍分类:哲学类、社会科学类、政治类、法律类、军事类、经济类、文化类、教育类、体育类、语言文字类、艺术类、历史类、地理类、天文学类、生物学类、医学卫生类、农业类
BookCategory = ["哲学", "社会科学", "政治", "法律", "军事", "经济", "文化", "教育", "体育", "语言文字", "艺术", "历史"
, "地理", "天文学", "生物学", "医学卫生", "农业"]
self.resize(300, 400)
self.layout = QFormLayout()
self.setLayout(self.layout)

# Label控件
self.returnStudentLabel = QLabel("还 书 人:")
self.returnStudentIdLabel = QLabel(self.studentId)
self.titlelabel = QLabel(" 归还书籍")
self.bookNameLabel = QLabel("书 名:")
self.bookIdLabel = QLabel("书 号:")
self.authNameLabel = QLabel("作 者:")
self.categoryLabel = QLabel("分 类:")
self.publisherLabel = QLabel("出 版 社:")
self.publishDateLabel = QLabel("出版日期:")

# button控件
self.returnBookButton = QPushButton("确认归还")

# lineEdit控件
self.bookNameEdit = QLineEdit()
self.bookIdEdit = QLineEdit()
self.authNameEdit = QLineEdit()
self.categoryComboBox = QComboBox()
self.categoryComboBox.addItems(BookCategory)
self.publisherEdit = QLineEdit()
self.publishTime = QLineEdit()

self.bookNameEdit.setMaxLength(10)
self.bookIdEdit.setMaxLength(6)
self.authNameEdit.setMaxLength(10)
self.publisherEdit.setMaxLength(10)

# 添加进formlayout
self.layout.addRow("", self.titlelabel)
self.layout.addRow(self.returnStudentLabel, self.returnStudentIdLabel)
self.layout.addRow(self.bookNameLabel, self.bookNameEdit)
self.layout.addRow(self.bookIdLabel, self.bookIdEdit)
self.layout.addRow(self.authNameLabel, self.authNameEdit)
self.layout.addRow(self.categoryLabel, self.categoryComboBox)
self.layout.addRow(self.publisherLabel, self.publisherEdit)
self.layout.addRow(self.publishDateLabel, self.publishTime)
self.layout.addRow("", self.returnBookButton)

# 设置字体
font = QFont()
font.setPixelSize(20)
self.titlelabel.setFont(font)
font.setPixelSize(16)
self.returnStudentIdLabel.setFont(font)
font.setPixelSize(14)
self.returnStudentLabel.setFont(font)
self.bookNameLabel.setFont(font)
self.bookIdLabel.setFont(font)
self.authNameLabel.setFont(font)
self.categoryLabel.setFont(font)
self.publisherLabel.setFont(font)
self.publishDateLabel.setFont(font)

self.bookNameEdit.setFont(font)
self.bookNameEdit.setReadOnly(True)
self.bookNameEdit.setStyleSheet("background-color:#363636")
self.bookIdEdit.setFont(font)
self.authNameEdit.setFont(font)
self.authNameEdit.setReadOnly(True)
self.authNameEdit.setStyleSheet("background-color:#363636")
self.publisherEdit.setFont(font)
self.publisherEdit.setReadOnly(True)
self.publisherEdit.setStyleSheet("background-color:#363636")
self.publishTime.setFont(font)
self.publishTime.setStyleSheet("background-color:#363636")
self.categoryComboBox.setFont(font)
self.categoryComboBox.setStyleSheet("background-color:#363636")

# button设置
font.setPixelSize(16)
self.returnBookButton.setFont(font)
self.returnBookButton.setFixedHeight(32)
self.returnBookButton.setFixedWidth(140)

# 设置间距
self.titlelabel.setMargin(8)
self.layout.setVerticalSpacing(10)
self.returnBookButton.clicked.connect(self.returnButtonClicked)
self.bookIdEdit.textChanged.connect(self.bookIdEditChanged)

def returnButtonClicked(self):
# 获取书号,书号为空或并未借阅,则弹出错误
# 更新Book_User表User表以及Book表
BookId = self.bookIdEdit.text()
# BookId为空的处理
if (BookId == ""):
print(QMessageBox.warning(self, "警告", "你所要还的书不存在,请查看输入", QMessageBox.Yes, QMessageBox.Yes))
return
# 打开数据库
db = db = QSqlDatabase.addDatabase("QSQLITE")
db.setDatabaseName('./db/LibraryManagement.db')
db.open()
query = QSqlQuery()
# 如果未借阅
sql = "SELECT * FROM User_Book WHERE StudentId='%s' AND BookId='%s' AND BorrowState=1" %(self.studentId,BookId)
query.exec_(sql)
if (not query.next()):
print(QMessageBox.information(self, "提示", "您并未借阅此书,故无需归还", QMessageBox.Yes, QMessageBox.Yes))
return
# 更新User表
sql = "UPDATE User SET NumBorrowed=NumBorrowed-1 WHERE StudentId='%s'" % self.studentId
query.exec_(sql)
db.commit()
# 更新Book表
sql = "UPDATE Book SET NumCanBorrow=NumCanBorrow+1 WHERE BookId='%s'" % BookId
query.exec_(sql)
db.commit()
# 更新User_Book表
timenow = time.strftime('%Y-%m-%d', time.localtime(time.time()))
sql = "UPDATE User_Book SET ReturnTime='%s',BorrowState=0 WHERE StudentId='%s' AND BookId='%s' AND BorrowState=1" % (timenow,self.studentId,BookId)
query.exec_(sql)
db.commit()
print(QMessageBox.information(self, "提示", "归还成功!", QMessageBox.Yes, QMessageBox.Yes))
self.return_book_success_signal.emit()
self.close()
return

def bookIdEditChanged(self):
bookId = self.bookIdEdit.text()
if (bookId == ""):
self.bookNameEdit.clear()
self.publisherEdit.clear()
self.authNameEdit.clear()
self.publishTime.clear()
db = QSqlDatabase.addDatabase("QSQLITE")
db.setDatabaseName('./db/LibraryManagement.db')
db.open()
query = QSqlQuery()
# 在User_Book表中找借阅记录,如果存在借阅,则更新form内容
sql = "SELECT * FROM User_Book WHERE StudentId='%s' AND BookId='%s' AND BorrowState=1" % (
self.studentId, bookId)
query.exec_(sql)
if (query.next()):
# 更新form内容
sql = "SELECT * FROM Book WHERE BookId='%s'" % (bookId)
query.exec_(sql)
# 查询对应书号,如果存在就更新form
if (query.next()):
self.bookNameEdit.setText(query.value(0))
self.authNameEdit.setText(query.value(2))
self.categoryComboBox.setCurrentText(query.value(3))
self.publisherEdit.setText(query.value(4))
self.publishTime.setText(query.value(5))
return


if __name__ == "__main__":
app = QApplication(sys.argv)
app.setWindowIcon(QIcon("./images/MainWindow_1.png"))
app.setStyleSheet(qdarkstyle.load_stylesheet_pyqt5())
mainMindow = returnBookDialog("PB15000135")
mainMindow.show()
sys.exit(app.exec_())

实现效果#

这里写图片描述
这里写图片描述
这里写图片描述

最后附上链接#

项目地址:github仓库链接

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