專案介紹

這個小專案是由MySQL資料庫作為後端，python的pyqt5來做ui介面的小程式。

功能介紹

首先小專案是一個登陸介面，輸入賬號密碼即可登入操作介面。

操作介面是由一個按鈕組和一張表組成的，左側的其中三個按鈕可以重新整理對應的供貨表，銷售表和出貨表。另外三個按鈕可以實現資料庫的插入刪除和修改操作（點選以後出現細化的視窗）。

在資料庫方面實現了連帶刪除，連帶修改，同步進貨時間等功能。

執行前提

這個小程式使用的是innodb的搜尋引擎，所以需要執行tomcat的MySQL資料庫環境。

另外還需要python的執行環境。

執行時即執行gui_enter.py。

下面是gui_enter.py的程式碼

import sys, os
if hasattr(sys, 'frozen'):
    os.environ['PATH'] = sys._MEIPASS + ";" + os.environ['PATH']
from PyQt5.QtWidgets import QWidget, QApplication, QLineEdit, QPushButton, QLabel
from PyQt5.QtGui import QIcon, QPixmap, QPalette, QBrush
import sys
import gui

class MyEnter(QWidget):
    def
 
 __init__(self):
        super(MyEnter, self).__init__()
        self.initUI()

    def initUI(self):
        # 設定視窗的劇本屬性（視窗名，視窗圖示，視窗大小，視窗鎖定）
        self.setWindowTitle('商丘學院超市管理系統-登入')
        self.setWindowIcon(QIcon('shop.png'))
        self.resize(500, 308)
        self.setFixedSize(self.width(), self.height())

        
 
# 設定背景圖片
        window_pale = QPalette()
        window_pale.setBrush(self.backgroundRole(), QBrush(QPixmap("enter_img.jpg")))
        self.setPalette(window_pale)

        # 新增登入元件
        btn = QPushButton('確認', self)
        btn.move(300, 180)
        lbl_1 = QLabel('資料庫賬號', self)
        lbl_1.move(225, 100)
        lbl_2 = QLabel('資料庫密碼', self)
        lbl_2.move(225, 150)
        self.my_le_1 = QLineEdit(self)
        self.my_le_1.move(305, 95)
        self.my_le_2 = QLineEdit(self)
        self.my_le_2.move(305, 145)

        # 設定登入事件
        btn.clicked.connect(self.enter_pass)

        # 顯示
        self.show()

    def enter_pass(self):
        a_str = self.my_le_1.text()
        b_str = self.my_le_2.text()
        # if 後的條件迴圈改為有返回值的mysql登入函式
        if a_str == '123' and b_str == '123':
            self.mw = gui.MyWidget()
            self.mw.show()
            self.close()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ME = MyEnter()
    app.exec_()

下面是gui.py的程式碼

from PyQt5 import QtWidgets, QtGui
from PyQt5.QtWidgets import QMessageBox, QHeaderView
import gui_table
import pymysql
from PyQt5.QtGui import QIcon, QPixmap, QPalette, QBrush

class MyWidget(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUi()
        self.conn = pymysql.connect('localhost', 'root', 'root', 'supermarket')

    def initUi(self):
        # 設定視窗標題
        self.setWindowTitle('商丘學院超市管理系統')
        self.setWindowIcon(QIcon('shop.png'))

        # 設定視窗大小
        self.resize(900, 700)

        # 建立一個視窗部件
        self.widget = QtWidgets.QWidget()

        # 建立一個網格佈局
        self.grid_layout = QtWidgets.QGridLayout()

        # 設定視窗部件的佈局為網格佈局
        self.widget.setLayout(self.grid_layout)

        # 建立一個按鈕組
        self.group_box = QtWidgets.QGroupBox('資料庫按鈕')
        self.group_box_layout = QtWidgets.QVBoxLayout()
        self.group_box.setLayout(self.group_box_layout)

        # 建立一個表格部件
        self.table_widget = QtWidgets.QTableView()

        # 將上述兩個部件新增到網格佈局中
        self.grid_layout.addWidget(self.group_box, 0, 0)
        self.grid_layout.addWidget(self.table_widget, 0, 1)

        # 建立按鈕組的按鈕
        self.b_show_gys = QtWidgets.QPushButton("顯示(更新)供應商表")
        self.b_show_wp = QtWidgets.QPushButton("顯示(更新)物品表")
        self.b_show_ch = QtWidgets.QPushButton("顯示(更新)出貨表")
        self.b_delete_row = QtWidgets.QPushButton("刪除資料")
        self.b_add_row = QtWidgets.QPushButton("新增資料")
        self.b_update = QtWidgets.QPushButton('修改資料')
        self.b_search = QtWidgets.QPushButton('查詢資料')

        # 新增按鈕到按鈕組中
        self.group_box_layout.addWidget(self.b_show_gys)
        self.group_box_layout.addWidget(self.b_show_wp)
        self.group_box_layout.addWidget(self.b_show_ch)
        self.group_box_layout.addWidget(self.b_delete_row)
        self.group_box_layout.addWidget(self.b_add_row)
        self.group_box_layout.addWidget(self.b_update)
        self.group_box_layout.addWidget(self.b_search)

        # 新增觸發事件
        self.b_show_wp.clicked.connect(self.show_data)
        self.b_show_gys.clicked.connect(self.show_data)
        self.b_show_ch.clicked.connect(self.show_data)
        self.b_delete_row.clicked.connect(self.del_data)
        self.b_add_row.clicked.connect(self.add_data)
        self.b_update.clicked.connect(self.update_data)
        self.b_search.clicked.connect(self.search_data)

        # 設定UI介面的核心部件
        self.setCentralWidget(self.widget)

        # 設定視窗背景
        window_pale = QPalette()
        window_pale.setBrush(self.backgroundRole(), QBrush(QPixmap("supermarket.jpg")))
        self.setPalette(window_pale)

        self.table_widget.horizontalHeader().setStretchLastSection(True)
        self.table_widget.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)

    def show_data(self):
        sender = self.sender()
        model = QtGui.QStandardItemModel()
        cursor = self.conn.cursor()
        if sender.text() == '顯示(更新)供應商表':
            model.setHorizontalHeaderLabels(['供貨編號', '供貨名稱', '聯絡方式'])
            sql = cursor.execute('select * from supplier')
            data = cursor.fetchall()
            m = 0
            for row in data:
                n = 0
                for item in row:
                    model.setItem(m, n, QtGui.QStandardItem(str(item)))
                    n += 1
                m += 1
            self.table_widget.setModel(model)
        elif sender.text() == '顯示(更新)物品表':
            model.setHorizontalHeaderLabels(['物品編號', '物品名稱', '供貨編號', '存貨數量', '進價'])
            sql = cursor.execute('select * from goods')
            data = cursor.fetchall()
            m = 0
            for row in data:
                n = 0
                for item in row:
                    model.setItem(m, n, QtGui.QStandardItem(str(item)))
                    n += 1
                m += 1
            self.table_widget.setModel(model)
        elif sender.text() == '顯示(更新)出貨表':
            model.setHorizontalHeaderLabels(['銷售編號', '物品編號', '出貨數量', '售價', '出售日期'])
            sql = cursor.execute('select * from sale')
            data = cursor.fetchall()
            m = 0
            for row in data:
                n = 0
                for item in row:
                    model.setItem(m, n, QtGui.QStandardItem(str(item)))
                    n += 1
                m += 1
            self.table_widget.setModel(model)
        cursor.close()

    def update_data(self):
        sender = self.sender()
        self.mtg_1 = gui_table.MyTableGui(sender, self.conn)
        self.mtg_1.show()

    def add_data(self):
        sender = self.sender()
        self.mtg_2 = gui_table.MyTableGui(sender, self.conn)
        self.mtg_2.show()

    def del_data(self):
        sender = self.sender()
        self.mtg_3 = gui_table.MyTableGui(sender, self.conn)
        self.mtg_3.show()

    def search_data(self):
        sender = self.sender()
        self.mtg_4 = gui_table.MyTableGui(sender, self.conn)
        self.mtg_4.show()

    def closeEvent(self, event):
        mb = QMessageBox.question(self, '系統提示', '是否關閉視窗', QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)
        if mb == QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()

最後是gui_table.py的程式碼

from PyQt5.QtWidgets import QPushButton, QWidget, QHBoxLayout, QLabel, QLineEdit, QVBoxLayout, QMessageBox, QHeaderView
from PyQt5.QtGui import QIcon, QStandardItemModel, QStandardItem
from PyQt5 import QtWidgets


class MyTableGui(QWidget):
    def __init__(self, sender, conn):
        super(MyTableGui, self).__init__()
        global sender_1, con
        sender_1 = sender
        con = conn
        self.initUI()

    def initUI(self):
        self.setWindowIcon(QIcon('shop.png'))
        self.setWindowTitle('選擇%s的超市表單' % sender_1.text())
        self.resize(500, 100)

        h_layout = QHBoxLayout(self)
        btn_gys = QPushButton('供應商表單')
        btn_wp = QPushButton('物品表單')
        btn_ch = QPushButton('出貨表單')

        h_layout.addWidget(btn_gys)
        h_layout.addWidget(btn_wp)
        h_layout.addWidget(btn_ch)

        btn_gys.clicked.connect(self.table_gys)
        btn_wp.clicked.connect(self.table_wp)
        btn_ch.clicked.connect(self.table_ch)

    def table_gys(self):
        self.deltable = Table_gys()
        self.deltable.show()
        self.close()

    def table_wp(self):
        self.deltable = Table_wp()
        self.deltable.show()
        self.close()

    def table_ch(self):
        self.deltable = Table_ch()
        self.deltable.show()
        self.close()


class Table_gys(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowIcon(QIcon('shop.png'))

        if sender_1.text() == '刪除資料':
            self.setWindowTitle('刪除-供應商表單')
            self.resize(400, 130)
            self.setFixedSize(self.width(), self.height())
            lbl_1 = QLabel('供貨編號', self)
            lbl_1.move(70, 20)
            self.le_1 = QLineEdit(self)
            self.le_1.move(150, 15)
            btn = QPushButton('確定', self)
            btn.move(145, 70)
            btn.clicked.connect(self.del_data)
        elif sender_1.text() == '新增資料':
            self.setWindowTitle('新增-供應商表單')
            self.resize(400, 300)
            self.setFixedSize(self.width(), self.height())
            lbl_1 = QLabel('供貨編號(必填)', self)
            lbl_1.move(30, 20)
            lbl_2 = QLabel('供貨名稱', self)
            lbl_2.move(70, 70)
            lbl_3 = QLabel('聯絡方式', self)
            lbl_3.move(70, 120)
            self.le_1 = QLineEdit(self)
            self.le_1.move(150, 15)
            self.le_2 = QLineEdit(self)
            self.le_2.move(150, 65)
            self.le_3 = QLineEdit(self)
            self.le_3.move(150, 115)
            btn = QPushButton('確定', self)
            btn.move(145, 250)
            btn.clicked.connect(self.add_data)
        elif sender_1.text() == '修改資料':
            self.setWindowTitle('修改-供應商表單')
            self.resize(400, 300)
            self.setFixedSize(self.width(), self.height())
            lbl_1 = QLabel('要修改的供貨編號', self)
            lbl_1.move(20, 20)
            lbl_2 = QLabel('供貨編號', self)
            lbl_2.move(70, 70)
            lbl_3 = QLabel('供貨名稱', self)
            lbl_3.move(70, 120)
            lbl_4 = QLabel('聯絡方式', self)
            lbl_4.move(70, 170)
            self.le_1 = QLineEdit(self)
            self.le_1.move(150, 15)
            self.le_2 = QLineEdit(self)
            self.le_2.move(150, 65)
            self.le_3 = QLineEdit(self)
            self.le_3.move(150, 115)
            self.le_4 = QLineEdit(self)
            self.le_4.move(150, 165)
            btn = QPushButton('確定', self)
            btn.move(145, 250)
            btn.clicked.connect(self.update_data)
        elif sender_1.text() == '查詢資料':
            self.setWindowTitle('查詢-供應商表單')

            self.resize(500, 300)
            self.setFixedSize(self.width(), self.height())
            v_layout = QVBoxLayout(self)
            h_layout = QHBoxLayout()
            v_layout.addLayout(h_layout)
            lbl_1 = QLabel('供貨編號')
            self.le_1 = QLineEdit()
            h_layout.addWidget(lbl_1)
            h_layout.addWidget(self.le_1)
            btn = QPushButton('確定', self)
            v_layout.addWidget(btn)
            self.table_widget = QtWidgets.QTableView()
            v_layout.addWidget(self.table_widget)
            btn.clicked.connect(self.search_data)
            self.table_widget.horizontalHeader().setStretchLastSection(True)
            self.table_widget.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)

    def del_data(self):
        try:
            cursor = con.cursor()
            cursor.execute('''delete from supplier where supplierid='%s';''' % self.le_1.text())
            con.commit()
            cursor.close()
            info = QMessageBox.information(self, '系統提示', '執行成功!\n點選Ok返回主介面,點選Cancel返回上一級。',
                                           QMessageBox.Ok | QMessageBox.Cancel, QMessageBox.Ok)
            if info == QMessageBox.Ok:
                self.close()
        except:
            con.rollback()
            QMessageBox.information(self, '系統提示', '發生錯誤,無法正常執行該操作,請確認資訊無誤後再試。',
                                    QMessageBox.Ok, QMessageBox.Ok)

    def add_data(self):
        try:
            cursor = con.cursor()
            a_str = ''
            if self.le_1.text() != '':
                a_str = a_str + '\'' + self.le_1.text() + '\'' + ','
            else:
                a_str = a_str + 'null' + ','
            if self.le_2.text() != '':
                a_str = a_str + '\'' + self.le_2.text() + '\'' + ','
            else:
                a_str = a_str + 'null' + ','
            if self.le_3.text() != '':
                a_str = a_str + '\'' + self.le_3.text() + '\''
            else:
                a_str = a_str + 'null'
            cursor.execute('''insert into supplier values(%s);''' % a_str)
            con.commit()
            cursor.close()
            info = QMessageBox.information(self, '系統提示', '執行成功!\n點選Ok返回主介面,點選Cancel返回上一級。',
                                           QMessageBox.Ok | QMessageBox.Cancel, QMessageBox.Ok)
            if info == QMessageBox.Ok:
                self.close()
        except:
            con.rollback()
            QMessageBox.information(self, '系統提示', '發生錯誤,無法正常執行該操作,請確認資訊無誤後再試。',
                                    QMessageBox.Ok, QMessageBox.Ok)

    def update_data(self):
        try:
            cursor = con.cursor()
            a_str = ''
            if self.le_2.text() != '':
                a_str = a_str + 'supplierid=' + '\'' + self.le_2.text() + '\''
                if self.le_3.text() != '' or self.le_4.text() != '':
                    a_str = a_str + ','
            if self.le_3.text() != '':
                a_str = a_str + 'suppliername=' + '\'' + self.le_3.text() + '\''
                if self.le_4.text() != '':
                    a_str = a_str + ','
            if self.le_4.text() != '':
                a_str = a_str + 'contact=' + '\'' + self.le_4.text() + '\''
            cursor.execute('''update supplier set %s where supplierid='%s';''' % (a_str, self.le_1.text()))
            con.commit()
            cursor.close()
            info = QMessageBox.information(self, '系統提示', '執行成功!\n點選Ok返回主介面,點選Cancel返回上一級。',
                                           QMessageBox.Ok | QMessageBox.Cancel, QMessageBox.Ok)
            if info == QMessageBox.Ok:
                self.close()
        except:
            con.rollback()
            QMessageBox.information(self, '系統提示', '發生錯誤,無法正常執行該操作,請確認資訊無誤後再試。',
                                    QMessageBox.Ok, QMessageBox.Ok)

    def search_data(self):
        try:
            cursor = con.cursor()
            cursor.execute('''select * from supplier where supplierid='%s';''' % self.le_1.text())
            con.commit()
            data = cursor.fetchall()
            model = QStandardItemModel()
            model.setHorizontalHeaderLabels(['供貨編號', '供貨名稱', '聯絡方式'])
            cursor.close()
            m = 0
            for row in data:
                n = 0
                for item in row:
                    model.setItem(m, n, QStandardItem(str(item)))
                    n += 1
                m += 1
            self.table_widget.setModel(model)
        except:
            con.rollback()
            QMessageBox.information(self, '系統提示', '發生錯誤,無法正常執行該操作,請確認資訊無誤後再試。',
                                    QMessageBox.Ok, QMessageBox.Ok)


class Table_wp(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowIcon(QIcon('shop.png'))

        if sender_1.text() == '刪除資料':
            self.setWindowTitle('刪除-物品表單')
            self.resize(400, 130)
            self.setFixedSize(self.width(), self.height())
            lbl_1 = QLabel('物品編號', self)
            lbl_1.move(70, 20)
            self.le_1 = QLineEdit(self)
            self.le_1.move(150, 15)
            btn = QPushButton('確定', self)
            btn.move(145, 70)
            btn.clicked.connect(self.del_data)
        elif sender_1.text() == '新增資料':
            self.setWindowTitle('新增-物品表單')
            self.resize(400, 300)
            self.setFixedSize(self.width(), self.height())
            lbl_1 = QLabel('物品編號(必填)', self)
            lbl_1.move(30, 20)
            lbl_2 = QLabel('物品名稱', self)
            lbl_2.move(70, 70)
            lbl_3 = QLabel('供貨編號(已有編號)', self)
            lbl_3.move(10, 120)
            lbl_4 = QLabel('存貨數量', self)
            lbl_4.move(70, 170)
            lbl_5 = QLabel('進價', self)
            lbl_5.move(70, 220)
            self.le_1 = QLineEdit(self)
            self.le_1.move(150, 15)
            self.le_2 = QLineEdit(self)
            self.le_2.move(150, 65)
            self.le_3 = QLineEdit(self)
            self.le_3.move(150, 115)
            self.le_4 = QLineEdit(self)
            self.le_4.move(150, 165)
            self.le_5 = QLineEdit(self)
            self.le_5.move(150, 215)
            btn = QPushButton('確定', self)
            btn.move(145, 250)
            btn.clicked.connect(self.add_data)
        elif sender_1.text() == '修改資料':
            self.setWindowTitle('修改-物品表單')
            self.resize(400, 300)
            self.setFixedSize(self.width(), self.height())
            lbl_1 = QLabel('要修改的物品編號', self)
            lbl_1.move(20, 20)
            lbl_2 = QLabel('物品編號', self)
            lbl_2.move(70, 60)
            lbl_3 = QLabel('物品名稱', self)
            lbl_3.move(70, 100)
            lbl_4 = QLabel('供貨編號(已有編號)', self)
            lbl_4.move(10, 140)
            lbl_5 = QLabel('庫存數量', self)
            lbl_5.move(70, 180)
            lbl_6 = QLabel('進價', self)
            lbl_6.move(70, 220)
            self.le_1 = QLineEdit(self)
            self.le_1.move(150, 15)
            self.le_2 = QLineEdit(self)
            self.le_2.move(150, 55)
            self.le_3 = QLineEdit(self)
            self.le_3.move(150, 95)
            self.le_4 = QLineEdit(self)
            self.le_4.move(150, 135)
            self.le_5 = QLineEdit(self)
            self.le_5.move(150, 175)
            self.le_6 = QLineEdit(self)
            self.le_6.move(150, 215)
            btn = QPushButton('確定', self)
            btn.move(145, 250)
            btn.clicked.connect(self.update_data)
        elif sender_1.text() == '查詢資料':
            self.setWindowTitle('查詢-物品表單')
            self.resize(700, 300)
            self.setFixedSize(self.width(), self.height())
            v_layout = QVBoxLayout(self)
            h_layout = QHBoxLayout()
            v_layout.addLayout(h_layout)
            lbl_1 = QLabel('物品編號')
            self.le_1 = QLineEdit()
            h_layout.addWidget(lbl_1)
            h_layout.addWidget(self.le_1)
            btn = QPushButton('確定', self)
            v_layout.addWidget(btn)
            self.table_widget = QtWidgets.QTableView()
            v_layout.addWidget(self.table_widget)
            btn.clicked.connect(self.search_data)
            self.table_widget.horizontalHeader().setStretchLastSection(True)
            self.table_widget.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)

    def del_data(self):
        try:
            cursor = con.cursor()
            cursor.execute('''delete from goods where goodsid='%s';''' % self.le_1.text())
            con.commit()
            cursor.close()
            info = QMessageBox.information(self, '系統提示', '執行成功!\n點選Ok返回主介面,點選Cancel返回上一級。',
                                           QMessageBox.Ok | QMessageBox.Cancel, QMessageBox.Ok)
            if info == QMessageBox.Ok:
                self.close()
        except:
            con.rollback()
            QMessageBox.information(self, '系統提示', '發生錯誤,無法正常執行該操作,請確認資訊無誤後再試。',
                                    QMessageBox.Ok, QMessageBox.Ok)

    def add_data(self):
        try:
            cursor = con.cursor()
            a_str = ''
            if self.le_1.text() != '':
                a_str = a_str + '\'' + self.le_1.text() + '\'' + ','
            else:
                a_str = a_str + 'null' + ','
            if self.le_2.text() != '':
                a_str = a_str + '\'' + self.le_2.text() + '\'' + ','
            else:
                a_str = a_str + 'null' + ','
            if self.le_3.text() != '':
                a_str = a_str + '\'' + self.le_3.text() + '\'' + ','
            else:
                a_str = a_str + 'null' + ','
            if self.le_4.text() != '':
                a_str = a_str + self.le_4.text() + ','
            else:
                a_str = a_str + 'null' + ','
            if self.le_5.text() != '':
                a_str = a_str + self.le_5.text()
            else:
                a_str = a_str + 'null'
            cursor.execute('''insert into goods values(%s);''' % a_str)
            con.commit()
            cursor.close()
            info = QMessageBox.information(self, '系統提示', '執行成功!\n點選Ok返回主介面,點選Cancel返回上一級。',
                                           QMessageBox.Ok | QMessageBox.Cancel, QMessageBox.Ok)
            if info == QMessageBox.Ok:
                self.close()
        except:
            con.rollback()
            QMessageBox.information(self, '系統提示', '發生錯誤,無法正常執行該操作,請確認資訊無誤後再試。',
                                    QMessageBox.Ok, QMessageBox.Ok)

    def update_data(self):
        try:
            cursor = con.cursor()
            a_str = ''
            if self.le_2.text() != '':
                a_str = a_str + 'goodsid=' + '\'' + self.le_2.text() + '\''
                if self.le_3.text() != '' or self.le_4.text() != '' or self.le_5.text() != '' or self.le_6.text() != '':
                    a_str = a_str + ','
            if self.le_3.text() != '':
                a_str = a_str + 'goodsname=' + '\'' + self.le_3.text() + '\''
                if self.le_4.text() != '' or self.le_5.text() != '' or self.le_6.text() != '':
                    a_str = a_str + ','
            if self.le_4.text() != '':
                a_str = a_str + 'supplierid=' + '\'' + self.le_4.text() + '\''
                if self.le_5.text() != '' or self.le_6.text() != '':
                    a_str = a_str + ','
            if self.le_5.text() != '':
                a_str = a_str + 'amount=' + self.le_5.text()
                if self.le_6.text() != '':
                    a_str = a_str + ','
            if self.le_6.text() != '':
                a_str = a_str + 'supplierprice=' + self.le_6.text()
            cursor.execute('''update goods set %s where goodsid='%s';''' % (a_str, self.le_1.text()))
            con.commit()
            cursor.close()
            info = QMessageBox.information(self, '系統提示', '執行成功!\n點選Ok返回主介面,點選Cancel返回上一級。',
                                           QMessageBox.Ok | QMessageBox.Cancel, QMessageBox.Ok)
            if info == QMessageBox.Ok:
                self.close()
        except:
            con.rollback()
            QMessageBox.information(self, '系統提示', '發生錯誤,無法正常執行該操作,請確認資訊無誤後再試。',
                                    QMessageBox.Ok, QMessageBox.Ok)

    def search_data(self):
        try:
            cursor = con.cursor()
            cursor.execute('''select * from goods where goodsid='%s';''' % self.le_1.text())
            con.commit()
            data = cursor.fetchall()
            model = QStandardItemModel()
            model.setHorizontalHeaderLabels(['物品編號', '物品名稱', '供貨編號', '存貨數量', '進價'])
            cursor.close()
            m = 0
            for row in data:
                n = 0
                for item in row:
                    model.setItem(m, n, QStandardItem(str(item)))
                    n += 1
                m += 1
            self.table_widget.setModel(model)
        except:
            con.rollback()
            QMessageBox.information(self, '系統提示', '發生錯誤,無法正常執行該操作,請確認資訊無誤後再試。',
                                    QMessageBox.Ok, QMessageBox.Ok)


class Table_ch(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowIcon(QIcon('shop.png'))

        if sender_1.text() == '刪除資料':
            self.setWindowTitle('刪除-出貨表單')
            self.resize(400, 140)
            self.setFixedSize(self.width(), self.height())
            lbl_1 = QLabel('物品編號', self)
            lbl_1.move(70, 20)
            lbl_2 = QLabel('銷售編號', self)
            lbl_2.move(70, 60)
            self.le_1 = QLineEdit(self)
            self.le_1.move(150, 15)
            self.le_2 = QLineEdit(self)
            self.le_2.move(150, 55)
            btn = QPushButton('確定', self)
            btn.move(145, 100)
            btn.clicked.connect(self.del_data)
        elif sender_1.text() == '新增資料':
            self.setWindowTitle('新增-出貨表單')
            self.resize(400, 300)
            self.setFixedSize(self.width(), self.height())
            lbl_1 = QLabel('銷售編號', self)
            lbl_1.move(70, 20)
            lbl_2 = QLabel('物品編號(已有編號)', self)
            lbl_2.move(10, 70)
            lbl_3 = QLabel('出貨數量', self)
            lbl_3.move(70, 120)
            lbl_4 = QLabel('售價', self)
            lbl_4.move(70, 170)
            self.le_1 = QLineEdit(self)
            self.le_1.move(150, 15)
            self.le_2 = QLineEdit(self)
            self.le_2.move(150, 65)
            self.le_3 = QLineEdit(self)
            self.le_3.move(150, 115)
            self.le_4 = QLineEdit(self)
            self.le_4.move(150, 165)
            btn = QPushButton('確定', self)
            btn.move(145, 250)
            btn.clicked.connect(self.add_data)
        elif sender_1.text() == '修改資料':
            self.setWindowTitle('修改-出貨表單')
            self.resize(400, 300)
            self.setFixedSize(self.width(), self.height())
            lbl_1 = QLabel('要修改的物品編號', self)
            lbl_1.move(20, 20)
            lbl_6 = QLabel('要修改的銷售編號', self)
            lbl_6.move(20, 60)
            lbl_2 = QLabel('銷售編號', self)
            lbl_2.move(70, 100)
            lbl_3 = QLabel('物品編號(已有編號)', self)
            lbl_3.move(10, 140)
            lbl_4 = QLabel('售出數量', self)
            lbl_4.move(70, 180)
            lbl_5 = QLabel('售價', self)
            lbl_5.move(70, 220)
            self.le_1 = QLineEdit(self)
            self.le_1.move(150, 15)
            self.le_6 = QLineEdit(self)
            self.le_6.move(150, 55)
            self.le_2 = QLineEdit(self)
            self.le_2.move(150, 95)
            self.le_3 = QLineEdit(self)
            self.le_3.move(150, 135)
            self.le_4 = QLineEdit(self)
            self.le_4.move(150, 175)
            self.le_5 = QLineEdit(self)
            self.le_5.move(150, 215)
            btn = QPushButton('確定', self)
            btn.move(145, 250)
            btn.clicked.connect(self.update_data)
        elif sender_1.text() == '查詢資料':
            self.setWindowTitle('查詢-出貨表單')
            self.resize(600, 300)
            self.setFixedSize(self.width(), self.height())
            v_layout = QVBoxLayout(self)
            h_layout = QHBoxLayout()
            v_layout.addLayout(h_layout)
            lbl_1 = QLabel('物品編號')
            self.le_1 = QLineEdit()
            h_layout.addWidget(lbl_1)
            h_layout.addWidget(self.le_1)
            btn = QPushButton('確定', self)
            v_layout.addWidget(btn)
            self.table_widget = QtWidgets.QTableView()
            v_layout.addWidget(self.table_widget)
            btn.clicked.connect(self.search_data)
            self.table_widget.horizontalHeader().setStretchLastSection(True)
            self.table_widget.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)

    def del_data(self):
        try:
            cursor = con.cursor()
            cursor.execute('''delete from sale where goodsid='%s' and saleid='%s';''' % (self.le_1.text(), self.le_2.text()))
            con.commit()
            cursor.close()
            info = QMessageBox.information(self, '系統提示', '執行成功!\n點選Ok返回主介面,點選Cancel返回上一級。',
                                           QMessageBox.Ok | QMessageBox.Cancel, QMessageBox.Ok)
            if info == QMessageBox.Ok:
                self.close()
        except:
            con.rollback()
            QMessageBox.information(self, '系統提示', '發生錯誤,無法正常執行該操作,請確認資訊無誤後再試。',
                                    QMessageBox.Ok, QMessageBox.Ok)

    def add_data(self):
        try:
            cursor = con.cursor()
            a_str = ''
            if self.le_1.text() != '':
                a_str = a_str + '\'' + self.le_1.text() + '\'' + ','
            else:
                a_str = a_str + 'null' + ','
            if self.le_2.text() != '':
                a_str = a_str + '\'' + self.le_2.text() + '\'' + ','
            else:
                a_str = a_str + 'null' + ','
            if self.le_3.text() != '':
                a_str = a_str + self.le_3.text() + ','
            else:
                a_str = a_str + 'null' + ','
            if self.le_4.text() != '':
                a_str = a_str + self.le_4.text()
            else:
                a_str = a_str + 'null'
            cursor.execute('''insert into sale values(%s,now());''' % a_str)
            con.commit()
            cursor.close()
            info = QMessageBox.information(self, '系統提示', '執行成功!\n點選Ok返回主介面,點選Cancel返回上一級。',
                                           QMessageBox.Ok | QMessageBox.Cancel, QMessageBox.Ok)
            if info == QMessageBox.Ok:
                self.close()
        except:
            con.rollback()
            QMessageBox.information(self, '系統提示', '發生錯誤,無法正常執行該操作,請確認資訊無誤後再試。',
                                    QMessageBox.Ok, QMessageBox.Ok)

    def update_data(self):
        try:
            cursor = con.cursor()
            a_str = ''
            if self.le_2.text() != '':
                a_str = a_str + 'saleid=' + '\'' + self.le_2.text() + '\''
                if self.le_3.text() != '' or self.le_4.text() != '' or self.le_5.text() != '':
                    a_str = a_str + ','
            if self.le_3.text() != '':
                a_str = a_str + 'goodsid=' + '\'' + self.le_3.text() + '\''
                if self.le_4.text() != '' or self.le_5.text() != '':
                    a_str = a_str + ','
            if self.le_4.text() != '':
                a_str = a_str + 'saleamount=' + self.le_4.text()
                if self.le_5.text() != '':
                    a_str = a_str + ','
            if self.le_5.text() != '':
                a_str = a_str + 'saleprice=' + self.le_5.text()
            cursor.execute('''update sale set %s where goodsid='%s' and saleid='%s';''' % (a_str, self.le_1.text(), self.le_6.text()))
            con.commit()
            cursor.close()
            info = QMessageBox.information(self, '系統提示', '執行成功!\n點選Ok返回主介面,點選Cancel返回上一級。',
                                           QMessageBox.Ok | QMessageBox.Cancel, QMessageBox.Ok)
            if info == QMessageBox.Ok:
                self.close()
        except:
            con.rollback()
            QMessageBox.information(self, '系統提示', '發生錯誤,無法正常執行該操作,請確認資訊無誤後再試。',
                                    QMessageBox.Ok, QMessageBox.Ok)

    def search_data(self):
        try:
            cursor = con.cursor()
            cursor.execute('''select * from sale where goodsid='%s';''' % self.le_1.text())
            con.commit()
            data = cursor.fetchall()
            model = QStandardItemModel()
            model.setHorizontalHeaderLabels(['銷售編號', '物品編號', '出貨數量', '售價', '出售日期'])
            cursor.close()
            m = 0
            for row in data:
                n = 0
                for item in row:
                    model.setItem(m, n, QStandardItem(str(item)))
                    n += 1
                m += 1
            self.table_widget.setModel(model)
        except:
            con.rollback()
            QMessageBox.information(self, '系統提示', '發生錯誤,無法正常執行該操作,請確認資訊無誤後再試。',
                                    QMessageBox.Ok, QMessageBox.Ok)

附加的MySQL程式碼

drop database supermarket;
set names gbk;
create database supermarket;
use supermarket;

create table supplier
(supplierid varchar(10) primary key,
suppliername varchar(10),
contact varchar(50))engine=innodb;

create table goods
(goodsid varchar(10) primary key,
goodsname varchar(10),
supplierid varchar(10) not null,
amount int,
supplierprice int,
foreign key(supplierid) references supplier(supplierid) on delete cascade on update cascade)engine=innodb;

create table sale
(saleid varchar(10),
goodsid varchar(10) not null,
saleamount int,
saleprice int,
saletime datetime,
foreign key(goodsid) references goods(goodsid) on delete cascade on update cascade)engine=innodb;



delimiter ##
create trigger sale_insert after insert on sale for each row
begin
    declare n int;
    if new.saleamount>0 then
    set n=new.saleamount;
    update goods set amount=amount-n where goodsid=new.goodsid;
    end if;
end;##
delimiter ;




delimiter ##
create trigger sale_update after update on sale for each row
begin
    declare n,o int;
    if new.saleamount>0 then
    set n=new.saleamount,o=old.saleamount;
    update goods set amount=amount+o-n where goodsid=new.goodsid;
    end if;
end;##
delimiter ;




insert into supplier values('A001','水果','12456');
insert into supplier values('A002','水果','12456');
insert into supplier values('A003','達利','10000');
insert into supplier values('A004','達利好吃點','10001');
insert into supplier values('A005','達利園瑞士捲','10002');
insert into supplier values('A006','樂山有限公司','10003');
insert into supplier values('A007','鼎聯商貿有限公司','10004');
insert into supplier values('A008','鼎聯商貿有限公司','10005');
insert into supplier values('A009','寬貿商貿有限公司','10006');
insert into supplier values('A010','大風商貿有限公司','10008');
insert into supplier values('A011','全華貿易有限公司','10009');
insert into supplier values('A012','明樂有限公司','10010');
insert into supplier values('A013','百商貿有限公司','10011');
insert into supplier values('A014','豐商貿有限公司','10012');
insert into supplier values('A015','豐商貿有限公司','10013');
insert into supplier values('A016','榮騰商貿有限公司','10014');
insert into supplier values('A017','樂山有限公司','10015');
insert into supplier values('A018','巨集大商貿有限公司','10016');
insert into supplier values('A019','蘇衛食品有限公司','10017');
insert into supplier values('A020','廣博','10018');





insert into goods values('G001','蘋果','A001',100,3);
insert into goods values('G002','香蕉','A002',200,3);
insert into goods  values('G003','達利法式軟麵包香奶味','A003',600,2);
insert into goods  values('G004','達利好吃點杏仁酥','A004',450,10);
insert into goods  values('G005','達利園瑞士捲','A005',1600,2);
insert into goods  values('G006','達能牛奶香脆餅乾','A006',430,4);
insert into goods  values('G007','達利園法式香奶麵包','A007',840,3);
insert into goods  values('G008','大寶SOD蜜','A008',600,40);
insert into goods  values('G009','大好大香酥花生','A009',680,10);
insert into goods  values('G010','得力山楂片','A010',1000,3);
insert into goods  values('G011','德芙黑巧克力','A011',650,8);
insert into goods  values('G012','雕牌洗潔精','A012',500,10);
insert into goods  values('G013','飛利浦剃鬚刀','A013',650,50);
insert into goods  values('G014','德芙榛子巧克力','A014',700,10);
insert into goods  values('G015','芬達橙味汽水','A015',600,4);
insert into goods  values('G016','光明牛奶','A016',500,5);
insert into goods  values('G017','光陽松花皮蛋','A017',1000,2);
insert into goods  values('G018','果然多CC果卷','A018',400,5);
insert into goods  values('G019','果然多特濃奶捲','A019',500,10);
insert into goods  values('G020','廣博削筆機','A020',110,20);



insert into sale values('S001','G001',10,4,now());
insert into sale values('S002','G002',20,6,now());
insert into sale values('S002','G003',25,3,now());
insert into sale values('S003','G002',5,6,now());
insert into sale values('S003','G005',20,4,now());
insert into sale values('S003','G004',5,11,now());
insert into sale values('S004','G006',20,5,now());
insert into sale values('S005','G007',15,4,now());
insert into sale values('S006','G008',2,50,now());
insert into sale values('S007','G009',30,11,now());
insert into sale values('S008','G010',20,4,now());
insert into sale values('S009','G012',3,11,now());
insert into sale values('S010','G011',1,9,now());
insert into sale values('S011','G013',2,60,now());
insert into sale values('S012','G014',10,11,now());
insert into sale values('S013','G015',2,5,now());
insert into sale values('S014','G016',2,6,now());
insert into sale values('S015','G017',10,3,now());
insert into sale values('S016','G018',20,6,now());
insert into sale values('S017','G019',30,11,now());
insert into sale values('S018','G020',2,22,now());
insert into sale values('S019','G011',2,9,now());
insert into sale values('S020','G016',2,6,now());
insert into sale values('S021','G001',10,4,now());
insert into sale values('S022','G002',20,6,now());
insert into sale values('S023','G003',25,3,now());
insert into sale values('S024','G002',5,6,now());
insert into sale values('S025','G005',20,4,now());
insert into sale values('S026','G004',5,11,now());
insert into sale values('S027','G006',20,5,now());
insert into sale values('S028','G007',15,4,now());
insert into sale values('S029','G010',20,4,now());
insert into sale values('S030','G012',3,11,now());

最後順便說一下，直接複製貼上程式碼可能有些細節需要修改。