如何使用 SQL 数据库更改 QCalendarWidget 中单元格的背景颜色

Question

这不是如何将 sql 数据输出到 QCalendarWidget 的重复问题

这是该问题的补充。

这也不是Qt5 日历小部件中突出显示日期间隔的重复，因为这只是在用户在实际 QT 页面上选择单元格时突出显示单元格，而不是使用 SQL 数据。 这也不是着色 PyQt5 QCalendarWidget 单元格和在单元格内打印数据的重复问题，因为答案不符合我希望我的程序执行的操作，即使用我的 sql 数据库更改日历特定单元格的背景颜色这样做，以及我无法得到工作的答案。

在第一个链接的问题中，我问用户如何按下日期，如果该日期在 sql 数据库中，它将输出与该日期对应的文本。 在一些帮助下，我设法让这个工作。 现在我想要做的是用蓝色背景突出显示那些日期，就像当前日期用红色背景突出显示一样。

我制作的 QT 页面是这样的：

我的QT页面

我的数据库是这样的：

我的数据库

我的代码是这样的：

        # -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'Calendar.ui'
#
# Created by: PyQt5 UI code generator 5.14.1
#
# WARNING! All changes made in this file will be lost!


from PyQt5 import QtCore, QtGui, QtWidgets
import sqlite3
import datetime
import PyQt5
from PyQt5.QtCore import QDate, Qt
from PyQt5.QtGui import (QColor, QFont, QTextCharFormat, QTextLength,
        QTextTableFormat)
from PyQt5.QtWidgets import (QApplication, QComboBox, QDateTimeEdit,
        QHBoxLayout, QLabel, QMainWindow, QSpinBox, QTextBrowser, QVBoxLayout,
        QWidget)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(1200, 900)
        MainWindow.setMinimumSize(QtCore.QSize(0, 0))
        MainWindow.setMaximumSize(QtCore.QSize(1200, 900))
        MainWindow.setStyleSheet("background-color: rgb(200, 200, 200);")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.Header = QtWidgets.QTextEdit(self.centralwidget)
        self.Header.setEnabled(False)
        self.Header.setGeometry(QtCore.QRect(-10, 0, 1300, 110))
        self.Header.setMinimumSize(QtCore.QSize(1300, 110))
        self.Header.setMaximumSize(QtCore.QSize(1300, 110))
        self.Header.setStyleSheet("background-color: rgb(255, 255, 255);\n"
"border-color: rgb(255, 255, 255);\n"
"border-width : 1.2px;\n"
"border-style:inset;")
        self.Header.setObjectName("Header")
        self.LECTURP = QtWidgets.QLabel(self.centralwidget)
        self.LECTURP.setGeometry(QtCore.QRect(512, 2, 180, 61))
        self.LECTURP.setStyleSheet("color: rgb(0, 176, 240);\n"
"font: 8pt \"MS Shell Dlg 2\";\n"
"text-decoration: underline;\n"
"background-color: rgb(255, 255, 255);\n"
"font: 28pt \"Calbri\";\n"
"text-decoration: underline;")
        self.LECTURP.setObjectName("LECTURP")
        self.LecturpBanner = QtWidgets.QLabel(self.centralwidget)
        self.LecturpBanner.setGeometry(QtCore.QRect(320, 60, 561, 31))
        self.LecturpBanner.setStyleSheet("background-color: rgb(255, 255, 255);\n"
"color: rgb(0, 176, 240);\n"
"font: 14pt \"Calibri\";")
        self.LecturpBanner.setObjectName("LecturpBanner")
        self.calendarWidget = QtWidgets.QCalendarWidget(self.centralwidget)
        self.calendarWidget.setGeometry(QtCore.QRect(30, 110, 1141, 661))
        self.calendarWidget.setStyleSheet("alternate-background-color: rgb(255, 255, 255);\n"
"font: 75 16pt \"MS Shell Dlg 2\";\n"
"background-color: rgb(200, 200, 200);\n"
"selection-background-color: rgb(255, 0, 0);")
        self.calendarWidget.setObjectName("calendarWidget")
        self.DateInfoOutput = QtWidgets.QLabel(self.centralwidget)
        self.DateInfoOutput.setGeometry(QtCore.QRect(30, 778, 1141, 97))
        self.DateInfoOutput.setStyleSheet("background-color: rgb(255, 255, 255);\n"
"border-color: rgb(0, 0, 0);\n"
"font: 16pt \"Calibri\";\n"
"border-width : 1.2px;\n"
"border-style:inset;")
        self.DateInfoOutput.setText("")
        self.DateInfoOutput.setObjectName("DateInfoOutput")
        self.WeekNumber = QtWidgets.QLabel(self.centralwidget)
        self.WeekNumber.setGeometry(QtCore.QRect(56, 168, 113, 49))
        self.WeekNumber.setStyleSheet("background-color: rgb(255, 255, 255);\n"
"font: 16pt \"MS Shell Dlg 2\";")
        self.WeekNumber.setObjectName("WeekNumber")
        self.calendarWidget.raise_()
        self.Header.raise_()
        self.LECTURP.raise_()
        self.LecturpBanner.raise_()
        self.DateInfoOutput.raise_()
        self.WeekNumber.raise_()
        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

        self.editor = QTextBrowser()


        self.calendarWidget.clicked[QDate].connect(self.dateClicked)


    def dateClicked(self, clickedDate):
        connection = sqlite3.connect("Calendardatabase.db") 
        crsr = connection.cursor() 
        crsr.execute(
            'SELECT Text FROM Calendar WHERE Day = ? AND Month = ? AND YEAR = ?', 
            (clickedDate.day(), clickedDate.month(), clickedDate.year()))
        result = crsr.fetchone()

        if result:
            self.DateInfoOutput.setText(result[0])
        else:
            self.DateInfoOutput.setText('')


    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.LECTURP.setText(_translate("MainWindow", "LECTURP"))
        self.LecturpBanner.setText(_translate("MainWindow", "Lecture, Exam, Coursework, Timetable, Uploader and Reminder Program."))
        self.WeekNumber.setText(_translate("MainWindow", "Week No."))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

我试图按照你的意见，我已经做到了这一点：

    crsr.execute('SELECT Date FROM Calendar2 WHERE Number = ?', (Count,))
        Dates3 = crsr.fetchone()
        Dates3 = str(Dates3)
        Dates3 = Dates3.replace("'", "")
        Dates3 = Dates3.replace('(', '')
        Dates3 = Dates3.replace(')', '')
        Dates3 = Dates3.replace(',', '')
        print(All_Dates)

        print(Dates3)
        Dates3 = Dates3.replace('/', ',')


        self.dates = { QDate(2020, 3, 20): ["Um Sure"] }

        format = QTextCharFormat() 
        format.setBackground(QColor("salmon")) 
        self.calendarWidget.setDateTextFormat(Dates3, format)

无论我尝试运行它，我都会收到此错误：

Message=setDateTextFormat(self, Union[QDate, datetime.date], QTextCharFormat): 参数 1 有意外的类型 'str'

我尝试使用 self.dates 变量，但这也不起作用。 我不确定如何将日期转换为输出的 QDate 部分可接受的格式。

好的，一切正常，但是当我做这个 while 循环时，我只是想知道我是否做错了 python 或错误的 QT。

    Count = 1 
        while Count <= list3:
            connection = sqlite3.connect("Calendardatabase.db") 
            # This is the code for the database cursor 


            Current_Day = datetime.date.today().strftime("%A,")
            Current_Date = datetime.date.today().strftime("%d")
            Current_Month = datetime.date.today().strftime("%B")


            Combined_Date = ("It is a " + Current_Day + " It is the " + Current_Date + " of " + Current_Month)

            Combined_Date = str(Combined_Date)

            self.DateInfoOutput.setText(Combined_Date)

            cursor = self.editor.textCursor()



            crsr.execute('SELECT Date FROM Calendar2 WHERE Number = ?', (Count,))
            Dates3 = crsr.fetchone()
            Dates3 = str(Dates3)
            Dates3 = Dates3.replace("'", "")
            Dates3 = Dates3.replace('(', '')
            Dates3 = Dates3.replace(')', '')
            Dates3 = Dates3.replace(',', '')


            crsr.execute('SELECT Text FROM Calendar2 WHERE Number = ?', (Count,))
            Text = crsr.fetchone()
            Text = str(Text)
            Text = Text.replace("'", "")
            Text = Text.replace('(', '')
            Text = Text.replace(')', '')
            Text = Text.replace(',', '')


            print(Dates3)

            Dates3 = Dates3.replace('/', ' ')
            Dates3 = Dates3.replace("'", '')
            Dates3.split()

            sqlDay = int(Dates3[0:2])
            sqlMonth = int(Dates3[3:4])
            sqlYear = int(Dates3[6:10])



            self.dates = { QDate(sqlYear, sqlMonth, sqlDay): ["Hi"]}



            format = QTextCharFormat() 
            format.setBackground(QColor("lightblue")) 


            Count = Count + 1
            for date, value in self.dates.items(): 
                self.calendarWidget.setDateTextFormat(date, format)
                self.DateInfoOutput.setText(Text)
            else:
                self.DateInfoOutput.setText(Combined_Date)
        else:
            self.DateInfoOutput.setText(Combined_Date)

Answer 1

本案的程序是：

• 对数据库进行查询。
• 以字符串形式获取日期。
• 使用指向适当格式的QDate.fromString()方法将字符串转换为QDate ，并且
• 使用QCalendarWidget.setDateTextFormat()在QCalendarWidget设置该日期的格式。

import os
import sqlite3

from PyQt5 import QtCore, QtGui, QtWidgets

CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))

if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)

    calendar = QtWidgets.QCalendarWidget()
    calendar.show()

    connection = sqlite3.connect(os.path.join(CURRENT_DIR, "Calendardatabase.db"))
    crsr = connection.cursor()
    crsr.execute("""SELECT Date FROM Calendar2""")

    date_format = "d/M/yyyy"
    cell_format = QtGui.QTextCharFormat()
    cell_format.setBackground(QtGui.QColor("red"))

    for row in crsr.fetchall():
        date_str, *_ = row
        dt = QtCore.QDate.fromString(date_str, date_format)
        if dt.isValid():
            calendar.setDateTextFormat(dt, cell_format)
        else:
            print("{} does not match format {}".format(date_str, date_format))

    sys.exit(app.exec_())

Answer 2

在得到@eyllanesc 的帮助后，我已经完全完成了我的程序，我将把我的程序留在这里，这样如果有人遇到困难，他们可以使用我的程序作为指导，或者在任何情况下提供帮助。

    # -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'Calendar.ui'
#
# Created by: PyQt5 UI code generator 5.14.1
#
# WARNING! All changes made in this file will be lost!


from PyQt5 import QtCore, QtGui, QtWidgets
import sqlite3
import datetime
import PyQt5
from PyQt5.QtCore import QDate, Qt
from PyQt5.QtGui import (QColor, QFont, QTextCharFormat, QTextLength,
        QTextTableFormat)
from PyQt5.QtWidgets import (QApplication, QComboBox, QDateTimeEdit,
        QHBoxLayout, QLabel, QMainWindow, QSpinBox, QTextBrowser, QVBoxLayout,
        QWidget)

class Ui_CalendarWidget(object):
    def setupUi(self, CalendarWidget):
        CalendarWidget.setObjectName("CalendarWidget")
        CalendarWidget.resize(1200, 900)
        CalendarWidget.setMinimumSize(QtCore.QSize(0, 0))
        CalendarWidget.setMaximumSize(QtCore.QSize(1200, 900))
        CalendarWidget.setStyleSheet("background-color: rgb(200, 200, 200);")
        self.centralWidget = QtWidgets.QWidget(CalendarWidget)
        self.centralWidget.setObjectName("centralWidget")
        self.Header = QtWidgets.QTextEdit(self.centralWidget)
        self.Header.setEnabled(False)
        self.Header.setGeometry(QtCore.QRect(-10, 0, 1300, 110))
        self.Header.setMinimumSize(QtCore.QSize(1300, 110))
        self.Header.setMaximumSize(QtCore.QSize(1300, 110))
        self.Header.setStyleSheet("background-color: rgb(255, 255, 255);\n"
"border-color: rgb(255, 255, 255);\n"
"border-width : 1.2px;\n"
"border-style:inset;")
        self.Header.setObjectName("Header")
        self.LECTURP = QtWidgets.QLabel(self.centralWidget)
        self.LECTURP.setGeometry(QtCore.QRect(512, 2, 180, 61))
        self.LECTURP.setStyleSheet("color: rgb(0, 176, 240);\n"
"font: 8pt \"MS Shell Dlg 2\";\n"
"text-decoration: underline;\n"
"background-color: rgb(255, 255, 255);\n"
"font: 28pt \"Calbri\";\n"
"text-decoration: underline;")
        self.LECTURP.setObjectName("LECTURP")
        self.LecturpBanner = QtWidgets.QLabel(self.centralWidget)
        self.LecturpBanner.setGeometry(QtCore.QRect(320, 60, 561, 31))
        self.LecturpBanner.setStyleSheet("background-color: rgb(255, 255, 255);\n"
"color: rgb(0, 176, 240);\n"
"font: 14pt \"Calibri\";")
        self.LecturpBanner.setObjectName("LecturpBanner")
        self.calendarWidget = QtWidgets.QCalendarWidget(self.centralWidget)
        self.calendarWidget.setGeometry(QtCore.QRect(30, 110, 1141, 661))
        self.calendarWidget.setStyleSheet("alternate-background-color: rgb(255, 255, 255);\n"
"font: 75 16pt \"MS Shell Dlg 2\";\n"
"background-color: rgb(200, 200, 200);\n"
"selection-background-color: rgb(255, 0, 0);")
        self.calendarWidget.setObjectName("calendarWidget")
        self.DateInfoOutput = QtWidgets.QLabel(self.centralWidget)
        self.DateInfoOutput.setGeometry(QtCore.QRect(30, 778, 1141, 97))
        self.DateInfoOutput.setStyleSheet("background-color: rgb(255, 255, 255);\n"
"border-color: rgb(0, 0, 0);\n"
"font: 16pt \"Calibri\";\n"
"border-width : 1.2px;\n"
"border-style:inset;")
        self.DateInfoOutput.setText("")
        self.DateInfoOutput.setObjectName("DateInfoOutput")
        self.WeekNumber = QtWidgets.QLabel(self.centralWidget)
        self.WeekNumber.setGeometry(QtCore.QRect(56, 168, 113, 49))
        self.WeekNumber.setStyleSheet("background-color: rgb(255, 255, 255);\n"
"font: 16pt \"MS Shell Dlg 2\";")
        self.WeekNumber.setObjectName("WeekNumber")
        self.calendarWidget.raise_()
        self.Header.raise_()
        self.LECTURP.raise_()
        self.LecturpBanner.raise_()
        self.DateInfoOutput.raise_()
        self.WeekNumber.raise_()
        CalendarWidget.setCentralWidget(self.centralWidget)
        self.statusbar = QtWidgets.QStatusBar(CalendarWidget)
        self.statusbar.setObjectName("statusbar")
        CalendarWidget.setStatusBar(self.statusbar)

        self.retranslateUi(CalendarWidget)
        QtCore.QMetaObject.connectSlotsByName(CalendarWidget)

        self.editor = QTextBrowser()


        self.calendarWidget.clicked[QDate].connect(self.dateClicked)

        connection = sqlite3.connect("Calendardatabase.db")
        crsr = connection.cursor()

        Current_Day = datetime.date.today().strftime("%A,")
        Current_Date = datetime.date.today().strftime("%d")
        Current_Month = datetime.date.today().strftime("%B")

        Combined_Date = ("It is a " + Current_Day + " It is the " + Current_Date + " of " + Current_Month)

        Combined_Date = str(Combined_Date)

        self.DateInfoOutput.setText(Combined_Date)


        #This is where the SQL Data is converted to d/M/yyyy and is then highlighted onto the calendar widget itself.

        connection = sqlite3.connect("Calendardatabase.db")
        crsr = connection.cursor()
        crsr.execute("""SELECT Date FROM Calendar2""")

        date_format = "d/M/yyyy"
        cell_format = QtGui.QTextCharFormat()
        cell_format.setBackground(QtGui.QColor("lightblue"))

        for row in crsr.fetchall():
            date_str, *_ = row
            dt = QtCore.QDate.fromString(date_str, date_format)
            if dt.isValid():
                self.calendarWidget.setDateTextFormat(dt, cell_format)
            else:
                self.DateInfoOutput.setText("{} does not match format {}".format(date_str, date_format))









    def dateClicked(self, clickedDate):
        connection = sqlite3.connect("Calendardatabase.db") 
        # This is the code for the database cursor 
        crsr = connection.cursor() 
        Count = 1
        crsr.execute('SELECT Day FROM Calendar WHERE Number = ?', (Count,))
        RawDay = crsr.fetchone()
        Day = str(RawDay)
        Day = Day.replace('(', '')
        Day = Day.replace(')', '')
        Day = Day.replace(',', '')
        Day = int(Day)

        crsr.execute('SELECT Month FROM Calendar WHERE Number = ?', (Count,))
        RawMonth = crsr.fetchone()
        Month = str(RawMonth)
        Month = Month.replace('(', '')
        Month = Month.replace(')', '')
        Month = Month.replace(',', '')
        Month = int(Month)

        crsr.execute('SELECT Year FROM Calendar WHERE Number = ?', (Count,))
        RawYear = crsr.fetchone()
        Year = str(RawDay)
        Year = Year.replace('(', '')
        Year = Year.replace(')', '')
        Year = Year.replace(',', '')
        Year = int(Year)        


        Current_Day = datetime.date.today().strftime("%A,")
        Current_Date = datetime.date.today().strftime("%d")
        Current_Month = datetime.date.today().strftime("%B")


        Combined_Date = ("It is a " + Current_Day + " It is the " + Current_Date + " of " + Current_Month)

        Combined_Date = str(Combined_Date)

        self.DateInfoOutput.setText(Combined_Date)

        cursor = self.editor.textCursor()

        All_Dates = (Day, Month, Year)

        self.selectedDate = QDate.currentDate()
        connection = sqlite3.connect("Calendardatabase.db") 
        crsr = connection.cursor() 
        crsr.execute(
            'SELECT Text FROM Calendar WHERE Day = ? AND Month = ? AND YEAR = ?', 
            (clickedDate.day(), clickedDate.month(), clickedDate.year()))
        result = crsr.fetchone()

        self.Date = (clickedDate.day() , '/' , clickedDate.month() , '/' , clickedDate.year())



        if result:
            self.DateInfoOutput.setText(result[0])


        else:
            self.DateInfoOutput.setText(Combined_Date)








    def retranslateUi(self, CalendarWidget):
        _translate = QtCore.QCoreApplication.translate
        CalendarWidget.setWindowTitle(_translate("CalendarWidget", "CalendarWidget"))
        self.LECTURP.setText(_translate("CalendarWidget", "LECTURP"))
        self.LecturpBanner.setText(_translate("CalendarWidget", "Lecture, Exam, Coursework, Timetable, Uploader and Reminder Program."))
        self.WeekNumber.setText(_translate("CalendarWidget", "Week No."))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    CalendarWidget = QtWidgets.QMainWindow()
    ui = Ui_CalendarWidget()
    ui.setupUi(CalendarWidget)
    CalendarWidget.show()
    sys.exit(app.exec_())

为了让这个程序工作，你还需要我的数据库，你可以从这里得到它： https : //www.dropbox.com/s/cua9gypkl869hnm/Calendardatabase.db?dl=0如果你只是把它放在同一个文件夹中作为程序文件，这应该可以工作。

谢谢@eyllanesc 的所有帮助，如果没有你的帮助，我会在这个问题上被困数周:)