pyqt QChart没有显示任何结果

问题描述

我正在使用pyqt GUI应用程序在postgres数据库的图表中显示一些结果，但是没有用

这是我使用的代码

这就是我创建表格的方式

create_table_transaction = ''' CREATE TABLE IF NOT EXISTS transactions (
            id SERIAL PRIMARY KEY  UNIQUE NOT NULL,montant DECIMAL(100,2),medecin VARCHAR,date_d DATE,time_d TIME,users_id INTEGER,FOREIGN KEY(users_id) REFERENCES users(id)) '''

这是在Qchart小部件中绘制图表的功能

from PyQt5 import *
from PyQt5 import QtCore,QtGui,QtWidgets,QtPrintSupport
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import Qt
from PyQt5.QtSql import *
from PyQt5.QtPrintSupport import QPrintDialog,QPrinter,QPrintPreviewDialog
import sys,sqlite3
import psycopg2
import datetime
from datetime import timedelta
from PyQt5.QtCore import QDate

import sys

from PyQt5.QtChart import QChart,QLineSeries
from PyQt5.QtChart import *

from PyQt5.uic import loadUiType
from admin import Ui_MainWindow as ui

class MainApp(QMainWindow,ui):
    def __init__(self):
        QMainWindow.__init__(self)
        self.setupUi(self)
        self.Handel_Buttons()


    def Handel_Buttons(self):
        self.pushButton_113.clicked.connect(self.draw_chart01)


    def draw_chart01(self): #pushButton_113
        
            self.connection = psycopg2.connect(user="postgres",password="password",host="localhost",database="database")
            self.cur = self.connection.cursor()

            date = str(self.dateEdit_19.text()) 

            self.cur.execute( '''SELECT medecin,montant FROM transactions WHERE date_d = %s ''',(date,))
            rows = self.cur.fetchall()

            rightseries = QPieSeries()

            for entry in rows:
                print(entry)
                rightseries.append(entry[0],entry[1])

            rightchart = QChart()
            rightchart.addSeries(rightseries)
            rightchart.setTitle("title")
            rightchart.setAnimationOptions(QChart.SeriesAnimations)

            self.graphicsView = QChartView(rightchart)
            self.graphicsView.setRenderHint(QPainter.Antialiasing)


if __name__ == '__main__':
    
    app = QApplication(sys.argv)
    app.setStyle('Fusion')
    window = MainApp()
    window.show()
    sys.exit(app.exec_())

这是我的用户界面

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <widget class="QChartView" name="graphicsView">
    <property name="geometry">
     <rect>
      <x>140</x>
      <y>150</y>
      <width>531</width>
      <height>361</height>
     </rect>
    </property>
   </widget>
   <widget class="QPushButton" name="pushButton_113">
    <property name="geometry">
     <rect>
      <x>550</x>
      <y>72</y>
      <width>121</width>
      <height>41</height>
     </rect>
    </property>
    <property name="text">
     <string>Recherche</string>
    </property>
   </widget>
   <widget class="QDateEdit" name="dateEdit_19">
    <property name="geometry">
     <rect>
      <x>40</x>
      <y>70</y>
      <width>471</width>
      <height>41</height>
     </rect>
    </property>
    <property name="dateTime">
     <datetime>
      <hour>0</hour>
      <minute>0</minute>
      <second>0</second>
      <year>2020</year>
      <month>1</month>
      <day>1</day>
     </datetime>
    </property>
    <property name="calendarPopup">
     <bool>true</bool>
    </property>
   </widget>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <customwidgets>
  <customwidget>
   <class>QChartView</class>
   <extends>QGraphicsView</extends>
   <header location="global">PyQt5.QtChart</header>
  </customwidget>
 </customwidgets>
 <resources/>
 <connections/>
</ui>

当我运行此功能（draw_chart01）时，它没有显示错误，在终端中，它仅向我显示了打印（输入）结果：

('doc01',Decimal('1400.00'))
('doc01',Decimal('14000.00'))
('doc01',Decimal('1500.00'))

在我的ui文件中，我像在这个问题How to insert QChartView in form with Qt Designer?

中的答案一样，升级了graphicsView

解决方法

执行self.graphicsView = QChartView(rightchart)并不能代替QChartView，但是“ graphicsView”变量现在可以指导新的QChartView，因此您会得到错误。解决方案是在现有的QChartView中设置QChart：

import sys

from PyQt5.QtWidgets import QApplication,QMainWindow
from PyQt5.QtChart import QPieSeries,QChart

import psycopg2

from admin import Ui_MainWindow as ui


class MainApp(QMainWindow,ui):
    def __init__(self):
        QMainWindow.__init__(self)
        self.setupUi(self)
        self.Handel_Buttons()

    def Handel_Buttons(self):
        self.pushButton_113.clicked.connect(self.draw_chart01)

    def draw_chart01(self):

        connection = psycopg2.connect(
            user="postgres",password="password",host="localhost",database="database"
        )
        cur = connection.cursor()

        date = str(self.dateEdit_19.text())

        cur.execute(
            """SELECT medecin,montant FROM transactions WHERE date_d = %s """,(date,)
        )

        rows = cur.fetchall()
        rightseries = QPieSeries()

        for medecin,montant in rows:
            rightseries.append(medecin,montant)

        rightchart = QChart()
        rightchart.addSeries(rightseries)
        rightchart.setTitle("title")
        rightchart.setAnimationOptions(QChart.SeriesAnimations)

        self.graphicsView.setChart(rightchart)


if __name__ == "__main__":

    app = QApplication(sys.argv)
    app.setStyle("Fusion")
    window = MainApp()
    window.show()
    sys.exit(app.exec_())