first

main.py

-print("Hello , blueocean!\n")
+import sys
+import pymysql
+
+from PyQt5.QtWidgets import QMainWindow, QApplication
+
+from test import Ui_MainWindow
+
+class Window(QMainWindow, Ui_MainWindow):
+    def __init__(self):
+        super(QMainWindow, self).__init__()
+        self.setupUi(self) # 渲染页面控件
+        self.connect_signals() # 设置信号槽
+
+    def connect_signals(self):
+        self.btn_sure.clicked.connect(self.btn_sure_clicked) # 绑定确定按钮事件
+        self.btn_cancel.clicked.connect(self.btn_cancel_clicked) # 绑定取消按钮时间
+
+    def btn_sure_clicked(self):
+        self.show_edit.setText('hello world') # 点击确定按钮显示hello world
+
+    def btn_cancel_clicked(self):
+        self.show_edit.clear() # 点击取消按钮清空显示框
+
+def dbPrint():
+    dbHost = "127.0.0.1"
+    dbPort = 3306
+    dbUser = "root"
+    dbPassword = "545715123"
+    dbName = "mysql_demo"
+    tableName = "tabel_demo"
+    conn = pymysql.connect(host=dbHost  # 连接名称，默认127.0.0.1
+                           , user=dbUser  # 用户名
+                           , passwd=dbPassword  # 密码
+                           , port=dbPort  # 端口，默认为3306
+                           , db=dbName  # 数据库名称
+                           )
+    cur = conn.cursor()  # 生成游标对象
+    sql = "select * from `" + tableName + "` "  # SQL语句
+    cur.execute(sql)  # 执行SQL语句
+    data = cur.fetchall()  # 通过fetchall方法获得数据
+    for i in data:  # 打印输出所有数据
+        print(i)
+    cur.close()  # 关闭游标
+    conn.close()  # 关闭连接
+
+def main():
+    dbPrint()
+    app = QApplication(sys.argv)
+    mywindow = Window()
+    mywindow.show()
+    sys.exit(app.exec_())
+
+if __name__ == "__main__":
+    main()
+    # dbPrint()
\ No newline at end of file

models.py

+# coding: utf-8
+from sqlalchemy import Column, Integer, String
+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()
+metadata = Base.metadata
+
+
+class TabelDemo(Base):
+    __tablename__ = 'tabel_demo'
+
+    id = Column(Integer, primary_key=True)
+    name = Column(String(255), nullable=False)
+    age = Column(Integer, nullable=False)

test.py

+# -*- coding: utf-8 -*-
+
+# Form implementation generated from reading ui file 'test.ui'
+#
+# Created by: PyQt5 UI code generator 5.15.4
+#
+# WARNING: Any manual changes made to this file will be lost when pyuic5 is
+# run again.  Do not edit this file unless you know what you are doing.
+
+
+from PyQt5 import QtCore, QtGui, QtWidgets
+
+
+class Ui_MainWindow(object):
+    def setupUi(self, MainWindow):
+        MainWindow.setObjectName("MainWindow")
+        MainWindow.resize(800, 600)
+        self.centralwidget = QtWidgets.QWidget(MainWindow)
+        self.centralwidget.setObjectName("centralwidget")
+        self.show_edit = QtWidgets.QLineEdit(self.centralwidget)
+        self.show_edit.setGeometry(QtCore.QRect(150, 190, 431, 261))
+        self.show_edit.setObjectName("show_edit")
+        self.btn_sure = QtWidgets.QPushButton(self.centralwidget)
+        self.btn_sure.setGeometry(QtCore.QRect(200, 140, 75, 23))
+        self.btn_sure.setObjectName("btn_sure")
+        self.btn_cancel = QtWidgets.QPushButton(self.centralwidget)
+        self.btn_cancel.setGeometry(QtCore.QRect(480, 140, 75, 23))
+        self.btn_cancel.setObjectName("btn_cancel")
+        MainWindow.setCentralWidget(self.centralwidget)
+        self.menubar = QtWidgets.QMenuBar(MainWindow)
+        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 23))
+        self.menubar.setObjectName("menubar")
+        MainWindow.setMenuBar(self.menubar)
+        self.statusbar = QtWidgets.QStatusBar(MainWindow)
+        self.statusbar.setObjectName("statusbar")
+        MainWindow.setStatusBar(self.statusbar)
+
+        self.retranslateUi(MainWindow)
+        QtCore.QMetaObject.connectSlotsByName(MainWindow)
+
+    def retranslateUi(self, MainWindow):
+        _translate = QtCore.QCoreApplication.translate
+        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
+        self.btn_sure.setText(_translate("MainWindow", "确定"))
+        self.btn_cancel.setText(_translate("MainWindow", "取消"))

test.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="QLineEdit" name="show_edit">
+    <property name="geometry">
+     <rect>
+      <x>150</x>
+      <y>190</y>
+      <width>431</width>
+      <height>261</height>
+     </rect>
+    </property>
+   </widget>
+   <widget class="QPushButton" name="btn_sure">
+    <property name="geometry">
+     <rect>
+      <x>200</x>
+      <y>140</y>
+      <width>75</width>
+      <height>23</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>确定</string>
+    </property>
+   </widget>
+   <widget class="QPushButton" name="btn_cancel">
+    <property name="geometry">
+     <rect>
+      <x>480</x>
+      <y>140</y>
+      <width>75</width>
+      <height>23</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>取消</string>
+    </property>
+   </widget>
+  </widget>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>800</width>
+     <height>23</height>
+    </rect>
+   </property>
+  </widget>
+  <widget class="QStatusBar" name="statusbar"/>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>