pyqt QChart剂量未显示任何结果

Question

我使用pyqt GUI应用程序在postgres数据库的图表中显示一些结果，但它不起的作用

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)) '''

这就是在Qchart窗口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ui

<?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>

当我运行这个功能(draw_chart01(时，它没有显示错误，在终端中，它只显示打印(输入(的结果，如下所示：

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

在我的ui文件中，我推广了graphicsView，就像这个问题中的答案一样。如何使用Qt Designer在表单中插入QChartView？

Answer 1

执行self.graphicsView = QChartView(rightchart)不会取代QChartView；graphicsView"；变量现在指导新的QChartView，所以您会得到错误。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_())