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PyQt5搭建图书馆管理系统(7)——用户管理

分析#

对于用户管理,本来应该包含添加用户,删除用户等操作的,但是为了实现简单,添加用户就用注册代替了,所以所谓用户管理,只是实现了用户的删除操作

为了删除用户的同时保护数据库的完整性和约束,需要进行以下操作

  • User表删除该用户
  • 将该用户所借阅的所有书籍全部归还

代码实现#

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

class UserManage(QDialog):
def __init__(self,parent=None):
super(UserManage, self).__init__(parent)
self.resize(280, 400)
self.layout = QVBoxLayout()
self.setLayout(self.layout)
self.setWindowTitle("管理用户")
# 用户数
self.userCount = 0
self.oldDeleteId = ""
self.oldDeleteName = ""
self.deleteId = ""
self.deleteName = ""
self.setUpUI()

def setUpUI(self):
self.db = QSqlDatabase.addDatabase("QSQLITE")
self.db.setDatabaseName('./db/LibraryManagement.db')
self.db.open()
self.query = QSqlQuery()
self.getResult()

# 表格设置
self.tableWidget = QTableWidget()
self.tableWidget.setRowCount(self.userCount)
self.tableWidget.setColumnCount(2)
self.tableWidget.setHorizontalHeaderLabels(['学号', '姓名'])
# 不可编辑
self.tableWidget.setEditTriggers(QAbstractItemView.NoEditTriggers)
# 标题可拉伸
self.tableWidget.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)
# 整行选中
self.tableWidget.setSelectionBehavior(QAbstractItemView.SelectRows)

self.layout.addWidget(self.tableWidget)
self.setRows()
self.deleteUserButton = QPushButton("删 除 用 户")
hlayout = QHBoxLayout()
hlayout.addWidget(self.deleteUserButton, Qt.AlignHCenter)
self.widget = QWidget()
self.widget.setLayout(hlayout)
self.widget.setFixedHeight(48)
font = QFont()
font.setPixelSize(15)
self.deleteUserButton.setFixedHeight(36)
self.deleteUserButton.setFixedWidth(180)
self.deleteUserButton.setFont(font)
self.layout.addWidget(self.widget, Qt.AlignCenter)
# 设置信号
self.deleteUserButton.clicked.connect(self.deleteUser)
self.tableWidget.itemClicked.connect(self.getStudentInfo)

def getResult(self):
sql = "SELECT StudentId,Name FROM User WHERE IsAdmin=0"
self.query.exec_(sql)
self.userCount = 0;
while (self.query.next()):
self.userCount += 1;
sql = "SELECT StudentId,Name FROM User WHERE IsAdmin=0"
self.query.exec_(sql)

def setRows(self):
font = QFont()
font.setPixelSize(14)
for i in range(self.userCount):
if (self.query.next()):
StudentIdItem = QTableWidgetItem(self.query.value(0))
StudentNameItem = QTableWidgetItem(self.query.value(1))
StudentIdItem.setFont(font)
StudentNameItem.setFont(font)
StudentIdItem.setTextAlignment(Qt.AlignHCenter | Qt.AlignVCenter)
StudentNameItem.setTextAlignment(Qt.AlignHCenter | Qt.AlignVCenter)
self.tableWidget.setItem(i, 0, StudentIdItem)
self.tableWidget.setItem(i, 1, StudentNameItem)
return

def getStudentInfo(self, item):
row = self.tableWidget.currentIndex().row()
self.tableWidget.verticalScrollBar().setSliderPosition(row)
self.getResult()
i = 0
while (self.query.next() and i != row):
i = i + 1
self.oldDeleteId = self.deleteId
self.oldDeleteName = self.deleteName
self.deleteId = self.query.value(0)
self.deleteName = self.query.value(1)

def deleteUser(self):
if (self.deleteId == "" and self.deleteName == ""):
print(QMessageBox.warning(self, "警告", "请选中要删除的用户", QMessageBox.Yes, QMessageBox.Yes))
return
elif (self.deleteId == self.oldDeleteId and self.deleteName == self.oldDeleteName):
print(QMessageBox.warning(self, "警告", "请选中要删除的用户", QMessageBox.Yes, QMessageBox.Yes))
return
if (QMessageBox.information(self, "提醒", "删除用户:%s,%s\n用户一经删除将无法恢复,是否继续?" % (self.deleteId, self.deleteName),
QMessageBox.Yes | QMessageBox.No,
QMessageBox.No) == QMessageBox.No):
return
# 从User表删除用户
sql = "DELETE FROM User WHERE StudentId='%s'" % (self.deleteId)
self.query.exec_(sql)
self.db.commit()
# 归还所有书籍
sql = "SELECT * FROM User_Book WHERE StudentId='%s' AND BorrowState=1" % self.deleteId
self.query.exec_(sql)
timenow = time.strftime('%Y-%m-%d', time.localtime(time.time()))
updateQuery=QSqlQuery()
while (self.query.next()):
bookId=self.query.value(1)
sql="UPDATE Book SET NumCanBorrow=NumCanBorrow+1 WHERE BookId='%s'"% bookId
updateQuery.exec_(sql)
self.db.commit()
sql="UPDATE User_Book SET ReturnTime='%s',BorrowState=0 WHERE StudentId='%s' AND BorrowState=1"%(timenow,self.deleteId)
self.query.exec_(sql)
self.db.commit()
print(QMessageBox.information(self,"提醒","删除用户成功!",QMessageBox.Yes,QMessageBox.Yes))
self.updateUI()
return

def updateUI(self):
self.getResult()
self.layout.removeWidget(self.widget)
self.layout.removeWidget(self.tableWidget)
sip.delete(self.widget)
sip.delete(self.tableWidget)
# 表格设置
self.tableWidget = QTableWidget()
self.tableWidget.setRowCount(self.userCount)
self.tableWidget.setColumnCount(2)
self.tableWidget.setHorizontalHeaderLabels(['学号', '姓名'])
# 不可编辑
self.tableWidget.setEditTriggers(QAbstractItemView.NoEditTriggers)
# 标题可拉伸
self.tableWidget.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)
# 整行选中
self.tableWidget.setSelectionBehavior(QAbstractItemView.SelectRows)

self.layout.addWidget(self.tableWidget)
self.setRows()
self.deleteUserButton = QPushButton("删 除 用 户")
hlayout = QHBoxLayout()
hlayout.addWidget(self.deleteUserButton, Qt.AlignHCenter)
self.widget = QWidget()
self.widget.setLayout(hlayout)
self.widget.setFixedHeight(48)
font = QFont()
font.setPixelSize(15)
self.deleteUserButton.setFixedHeight(36)
self.deleteUserButton.setFixedWidth(180)
self.deleteUserButton.setFont(font)
self.layout.addWidget(self.widget, Qt.AlignCenter)
# 设置信号
self.deleteUserButton.clicked.connect(self.deleteUser)
self.tableWidget.itemClicked.connect(self.getStudentInfo)

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

代码分析#

这里使用 QtableWidget来展示当前所有的用户的学号以及姓名
步骤如下:

  • 展示所有用户
  • 管理员选中一行
  • 点击删除用户
  • 提醒时候确认删除
  • 删除,同时刷新展示的数据

实现效果#

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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