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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，但它不起作用

这是我使用的代码

这就是我创建表的方式

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，在终端中它只显示打印（条目）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 graphicsView 就像这个问题的答案How to insert QChartView in form with Qt Designer?

4

1 回答 1

2

这样self.graphicsView = QChartView(rightchart)做不会替换 QChartView，但“graphicsView”变量现在会引导新的 QChartView，因此您会收到错误消息。解决办法是在已有的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_())
于 2020-10-12T04:33:39.737 回答