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Python PyQt5實戰(zhàn)項目之查詢器的實現(xiàn)流程詳解

發(fā)布日期：2021-12-13 05:17 | 文章來源：站長之家

簡介

這是一個操作數(shù)據(jù)庫（sqlite3）的項目，用PyQt5進行界面封裝。
此次項目最主要的是，主界面與子界面的交互,一個主界面與三個子界面交互
可以添加數(shù)據(jù)，修改數(shù)據(jù)，刪除數(shù)據(jù)

主界面

class MainWidget(QMainWindow):
 def __init__(self):
  super(MainWidget,self).__init__()
  self.ui_init()
  self.connect_init()
  self.sql_init()
 def ui_init(self):
  self.setWindowTitle('信息查詢')
  self.resize(600,700)
  self.addwidget = AddWidget()
  self.deletewidget = DeleteWidget()
  self.updatewidget = UpdateWidget()
  self.show_view = QTextBrowser()
  self.find_text = QLineEdit()
  
  self.find_btn = QPushButton()
  self.find_btn.setText('查詢')
  self.update_btn = QPushButton()
  self.update_btn.setText('更改')
  self.delete_btn = QPushButton()
  self.delete_btn.setText('刪除')
  self.add_btn = QPushButton()
  self.add_btn.setText('添加')
  self.status_bar = self.statusBar()
  self.widget = QWidget()
  self.h1_layout = QHBoxLayout()
  self.h2_layout = QHBoxLayout()
  self.v_layout = QVBoxLayout()
  self.h1_layout.addWidget(self.find_text)
  self.h1_layout.addWidget(self.find_btn)
  self.h2_layout.addWidget(self.update_btn)
  self.h2_layout.addWidget(self.delete_btn)
  self.h2_layout.addWidget(self.add_btn)
  self.v_layout.addLayout(self.h1_layout)
  self.v_layout.addLayout(self.h2_layout)
  self.v_layout.addWidget(self.show_view)
  self.widget.setLayout(self.v_layout)
  self.setCentralWidget(self.widget)

 def connect_init(self):
  '''
  信號與槽
  '''
  '''查詢功能'''
  self.find_btn.clicked.connect(lambda:self.find_slot(self.find_text.text()))
  '''添加功能'''
  self.add_btn.clicked.connect(self.add_slot)
  self.addwidget.add_close_signal.connect(lambda:self.setEnabled(True))
  self.addwidget.add_start_signal.connect(self.add_start_slot)
  
  '''刪除功能'''
  self.delete_btn.clicked.connect(self.delete_slot)
  self.deletewidget.delete_close_signal.connect(lambda:self.setEnabled(True))
  self.deletewidget.delete_start_signal.connect(self.delete_start_slot)
  '''更新功能'''
  self.update_btn.clicked.connect(self.update_slot)
  self.updatewidget.update_close_signal.connect(lambda:self.setEnabled(True))
  self.updatewidget.update_name_signal.connect(self.update_name_slot)
  self.updatewidget.update_show_signal.connect(self.update_show_slot)
 def sql_init(self):
  '''
  sqllite3初始化
  '''
  try:
conn = sqlite3.connect('find.db')
cursor = conn.cursor()
cursor.execute('select * from design')
cursor.close()
conn.close()
  except:
conn = sqlite3.connect('find.db')
cursor = conn.cursor()
cursor.execute('create table design (id  integer PRIMARY KEY AUTOINCREMENT,name varchar(20),show varchar(100))')
cursor.close()
conn.close()

  '''查詢槽'''
 def find_slot(self,content):
  try:
result = self.find_func(content)
self.status_bar.showMessage('查詢成功')
if result:
 self.show_view.append('<font size="5" color="red">共查詢 {} 條數(shù)據(jù)</font>'.format(len(result)))
 for i in range(len(result)):
  self.show_view.append('id:' + str(result[i][0]))
  self.show_view.append('名稱：' + result[i][1])
  self.show_view.append('說明：' + result[i][2])
else:
 self.show_view.append('<font size="5" color="red">共查詢 {} 條數(shù)據(jù)</font>'.format(len(result)))
  except Exception as e:
self.status_bar.showMessage('查詢失敗')
print(e)

  '''添加槽'''
 def add_slot(self):
  self.addwidget.show()
  self.setEnabled(False)
 def add_start_slot(self,name,show):
  try:
self.insert_func(name,show)
self.status_bar.showMessage('添加成功')
  except Exception as e:
self.status_bar.showMessage('添加失敗')
  self.setEnabled(True)
  self.addwidget.name_text.clear()
  self.addwidget.show_text.clear()
  self.addwidget.close()

  '''刪除槽'''
 def delete_slot(self):
  self.deletewidget.show()
  self.setEnabled(False)
 def delete_start_slot(self,id):
  try:
self.delete_func(id)
self.reset_func()
self.status_bar.showMessage('刪除成功')
  except  Exception as e:
self.status_bar.showMessage('刪除失敗')
  self.setEnabled(True)
  self.deletewidget.close()

  '''更新槽'''
 def update_slot(self):
  self.updatewidget.show()
  self.setEnabled(False)
 def update_name_slot(self,id,name):
  try:
self.update_name_func(id,name)
self.status_bar.showMessage('更新名稱成功')
  except Exception as e:
self.status_bar.showMessage('更新名稱失敗')
  self.setEnabled(True)
  self.updatewidget.close()
 def update_show_slot(self,id,name):
  try:
self.update_show_func(id,name)
self.status_bar.showMessage('更新名稱成功')
  except Exception as e:
self.status_bar.showMessage('更新名稱失敗')
  self.setEnabled(True)
  self.updatewidget.close()

  '''數(shù)據(jù)庫函數(shù)'''
 def insert_func(self,name,show):
  '''
  插入信息
  '''
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute('insert into design (id,name,show) values (null,"{}","{}")'.format(name,show))
  cursor.close()
  conn.commit()
  conn.close()
 def find_func(self,content):
  '''
  查詢信息
  '''
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute('SELECT * FROM design WHERE name LIKE "%{}%"'.format(content))
  result1 = cursor.fetchall()
  cursor.close()
  conn.close()
  return result1
 def count_func(self):
  '''
  信息數(shù)目
  '''
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute('select * from design')
  result = cursor.fetall()
  count = len(result)
  cursor.close()
  conn.close()
  return count
 def update_name_func(self,id,name):
  '''
  更新名稱信息
  '''
  print(id,name)
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute('update design set name = ? where id = ?',(name,id))
  cursor.close()
  conn.commit()
  conn.close()
 def update_show_func(self,id,name):
  '''
  更新說明信息
  '''
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute('update design set show = ? where id = ?',(name,id))
  cursor.close()
  conn.commit()
  conn.close()
 def delete_func(self,id):
  '''
  刪除信息
  '''
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute('delete from design where id = ?',(id,))
  cursor.close()
  conn.commit()
  conn.close()
 def reset_func(self):
 	'''
		自增列歸零
		'''
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute("DELETE FROM sqlite_sequence WHERE name = 'design'")
  cursor.close()
  conn.commit()
  conn.close()

這個類包括主界面，數(shù)據(jù)庫操作的函數(shù)，與其他界面操作的函數(shù)
當(dāng)子界面打開時，主界面不可使用
子界面向主界面發(fā)送信號，功能實現(xiàn)代碼都寫在主界面類中
子界面需要在主界面聲明，例如：self.addwidget = AddWidget()

添加功能槽

  '''添加槽'''
 def add_slot(self):
  self.addwidget.show()
  self.setEnabled(False)
 def add_start_slot(self,name,show):
  try:
self.insert_func(name,show)
self.status_bar.showMessage('添加成功')
  except Exception as e:
self.status_bar.showMessage('添加失敗')
  self.setEnabled(True)
  self.addwidget.name_text.clear()
  self.addwidget.show_text.clear()
  self.addwidget.close()

def add_slot(self):
  self.addwidget.show()
  self.setEnabled(False)

這個函數(shù)是用來啟動添加界面和將主界面設(shè)置為不可用狀態(tài)

 def add_start_slot(self,name,show):
  try:
self.insert_func(name,show)
self.status_bar.showMessage('添加成功')
  except Exception as e:
self.status_bar.showMessage('添加失敗')
  self.setEnabled(True)
  self.addwidget.name_text.clear()
  self.addwidget.show_text.clear()
  self.addwidget.close()

這個函數(shù)是添加功能的主要實現(xiàn)，調(diào)用數(shù)據(jù)庫插入函數(shù)，數(shù)據(jù)插入完畢后，清除添加子界面的文本，最后關(guān)閉添加子界面。其他功能槽大同小異

def reset_func()

def reset_func(self):
 	'''
		自增列歸零
		'''
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute("DELETE FROM sqlite_sequence WHERE name = 'design'")
  cursor.close()
  conn.commit()
  conn.close()

這個函數(shù)作用不是很大
只是將sqlite3數(shù)據(jù)庫自帶的系統(tǒng)表，數(shù)據(jù)庫被創(chuàng)建時，sqlite_sequence表會被自動創(chuàng)建，該表包括兩列。第一列為name，用來存儲表的名稱。第二列為seq，用來保存表對應(yīng)的RowID的最大值，當(dāng)對應(yīng)的表增加記錄，該表會自動更新。當(dāng)表刪除，該表對應(yīng)的記錄也會自動刪除。
本來我是想當(dāng)有數(shù)據(jù)刪除時，ID值能重新更新，可是這個方法，只有當(dāng)表內(nèi)數(shù)據(jù)全部刪除時，ID才會重新開始

添加數(shù)據(jù)的界面

class AddWidget(QWidget):
 '''
 添加功能界面
 '''
 add_start_signal = pyqtSignal(str,str)
 add_close_signal = pyqtSignal()
 def __init__(self):
  super(AddWidget,self).__init__()
  self.ui_init()
  self.connect_init()
 def ui_init(self):
  self.setWindowTitle('添加信息')
  self.setFixedSize(300,200)
  self.name_text = QLineEdit()
  self.show_text = QTextEdit()
  self.start_btn = QPushButton()
  self.start_btn.setText('添加')
  self.cancel_btn = QPushButton()
  self.cancel_btn.setText('取消')
  self.name_label = QLabel()
  self.name_label.setText('名稱：')
  self.show_label = QLabel()
  self.show_label.setText('說明：')
  self.h1_layout = QHBoxLayout()
  self.h2_layout = QHBoxLayout()
  self.h3_layout = QHBoxLayout()
  self.v_layout = QVBoxLayout()
  self.h1_layout.addWidget(self.name_label)
  self.h1_layout.addWidget(self.name_text)
  self.h2_layout.addWidget(self.show_label)
  self.h2_layout.addWidget(self.show_text)
  self.h3_layout.addWidget(self.start_btn)
  self.h3_layout.addWidget(self.cancel_btn)
  self.v_layout.addLayout(self.h1_layout)
  self.v_layout.addLayout(self.h2_layout)
  self.v_layout.addLayout(self.h3_layout)
  self.setLayout(self.v_layout)
 def connect_init(self):
  self.start_btn.clicked.connect(self.start_slot)
  self.cancel_btn.clicked.connect(self.close_slot)
 def start_slot(self):
  name = self.name_text.text()
  show = self.show_text.toPlainText()
  self.add_start_signal.emit(name,show)

 def close_slot(self):
  self.close()
  self.add_close_signal.emit()
 def closeEvent(self, event):
 	'''重寫關(guān)閉事件'''
  self.add_close_signal.emit()

這是添加數(shù)據(jù)的界面
自定義了兩個信號
1.添加數(shù)據(jù)的信號，當(dāng)按下添加按鈕，這個界面向主界面?zhèn)鬏攦蓚€字符串
2.結(jié)束這個界面的信號，不管是×了這個界面（重寫了關(guān)閉事件）還是按下取消按鈕，都向主界面發(fā)送信號，用來使主界面可以使用

刪除數(shù)據(jù)的界面

class DeleteWidget(QWidget):
 '''
 刪除功能界面
 '''
 delete_cancel_signal = pyqtSignal()
 delete_start_signal = pyqtSignal(str)
 delete_close_signal = pyqtSignal()
 def __init__(self):
  super(DeleteWidget,self).__init__()
  self.ui_init()
  self.connect_init()
 def ui_init(self):
  self.setWindowTitle('刪除信息')
  self.setFixedSize(300,100)
  self.id_text = QLineEdit()
  self.start_btn = QPushButton()
  self.start_btn.setText('刪除')
  self.cancel_btn = QPushButton()
  self.cancel_btn.setText('取消')
  self.id_label = QLabel()
  self.id_label.setText('要刪除的id：')
  self.h1_layout = QHBoxLayout()
  self.h2_layout = QHBoxLayout()
  self.v_layout = QVBoxLayout()
  self.h1_layout.addWidget(self.id_label)
  self.h1_layout.addWidget(self.id_text)
  self.h2_layout.addWidget(self.start_btn)
  self.h2_layout.addWidget(self.cancel_btn)
  self.v_layout.addLayout(self.h1_layout)
  self.v_layout.addLayout(self.h2_layout)
  self.setLayout(self.v_layout)
 def connect_init(self):
  self.start_btn.clicked.connect(self.start_slot)
  self.cancel_btn.clicked.connect(self.close_slot)
 def start_slot(self):
  id = self.id_text.text()
  self.delete_start_signal.emit(id)

 def close_slot(self):
  self.close()
  self.delete_close_signal.emit()
 def closeEvent(self, event):
  self.delete_close_signal.emit()

這是刪除數(shù)據(jù)的界面，跟之前界面布局基本一樣

修改數(shù)據(jù)的界面

class UpdateWidget(QWidget):
 '''
 更新功能界面
 '''
 update_name_signal = pyqtSignal(int,str)
 update_show_signal = pyqtSignal(int,str)
 update_close_signal = pyqtSignal()
 
 def __init__(self):
  super(UpdateWidget,self).__init__()
  self.ui_init()
  self.connect_init()
 def ui_init(self):
  self.setWindowTitle('修改信息')
  self.setFixedSize(300,150)
  self.content_text = QLineEdit()
  self.id_text = QLineEdit()
  self.name_btn = QPushButton()
  self.name_btn.setText('修改名稱')
  self.show_btn = QPushButton()
  self.show_btn.setText('修改說明')
  self.cancel_btn = QPushButton()
  self.cancel_btn.setText('取消')
  self.content_label = QLabel()
  self.content_label.setText('修改內(nèi)容：')
  self.id_label = QLabel()
  self.id_label.setText('選擇id為:')
  self.h1_layout = QHBoxLayout()
  self.h2_layout = QHBoxLayout()
  self.h3_layout = QHBoxLayout()
  self.v_layout = QVBoxLayout()
  self.h1_layout.addWidget(self.id_label)
  self.h1_layout.addWidget(self.id_text)
  self.h2_layout.addWidget(self.content_label)
  self.h2_layout.addWidget(self.content_text)
  self.h3_layout.addWidget(self.name_btn)
  self.h3_layout.addWidget(self.show_btn)
  self.h3_layout.addWidget(self.cancel_btn)
  self.v_layout.addLayout(self.h1_layout)
  self.v_layout.addLayout(self.h2_layout)
  self.v_layout.addLayout(self.h3_layout)
  self.setLayout(self.v_layout)
 def connect_init(self):
  self.name_btn.clicked.connect(self.update_name_slot)
  self.show_btn.clicked.connect(self.update_show_slot)
  self.cancel_btn.clicked.connect(self.close_slot)
 def update_name_slot(self):
  id = self.id_text.text()
  id = int(id)
  content = self.content_text.text()
  self.update_name_signal.emit(id,content)

 def update_show_slot(self):
  id = self.id_text.text()
  id = int(id)
  content = self.content_text.text()
  self.update_show_signal.emit(id,content)  
 def close_slot(self):
  self.close()
  self.update_close_signal.emit()
 def closeEvent(self, event):
  self.update_close_signal.emit()

這個更新數(shù)據(jù)的界面，跟之前的界面的布局基本一樣

全部代碼

import sys
from PyQt5.QtCore import pyqtSignal
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QPushButton, QTextEdit, QHBoxLayout, QVBoxLayout, QLineEdit, QLabel,QTextBrowser 
import sqlite3

class MainWidget(QMainWindow):
 def __init__(self):
  super(MainWidget,self).__init__()
  self.ui_init()
  self.connect_init()
  self.sql_init()
 def ui_init(self):
  self.setWindowTitle('信息查詢')
  self.resize(600,700)
  self.addwidget = AddWidget()
  self.deletewidget = DeleteWidget()
  self.updatewidget = UpdateWidget()
  self.show_view = QTextBrowser()
  self.find_text = QLineEdit()
  
  self.find_btn = QPushButton()
  self.find_btn.setText('查詢')
  self.update_btn = QPushButton()
  self.update_btn.setText('更改')
  self.delete_btn = QPushButton()
  self.delete_btn.setText('刪除')
  self.add_btn = QPushButton()
  self.add_btn.setText('添加')
  self.status_bar = self.statusBar()
  self.widget = QWidget()
  self.h1_layout = QHBoxLayout()
  self.h2_layout = QHBoxLayout()
  self.v_layout = QVBoxLayout()
  self.h1_layout.addWidget(self.find_text)
  self.h1_layout.addWidget(self.find_btn)
  self.h2_layout.addWidget(self.update_btn)
  self.h2_layout.addWidget(self.delete_btn)
  self.h2_layout.addWidget(self.add_btn)
  self.v_layout.addLayout(self.h1_layout)
  self.v_layout.addLayout(self.h2_layout)
  self.v_layout.addWidget(self.show_view)
  self.widget.setLayout(self.v_layout)
  self.setCentralWidget(self.widget)

 def connect_init(self):
  '''
  信號與槽
  '''
  '''查詢功能'''
  self.find_btn.clicked.connect(lambda:self.find_slot(self.find_text.text()))
  '''添加功能'''
  self.add_btn.clicked.connect(self.add_slot)
  self.addwidget.add_close_signal.connect(lambda:self.setEnabled(True))
  self.addwidget.add_start_signal.connect(self.add_start_slot)
  
  '''刪除功能'''
  self.delete_btn.clicked.connect(self.delete_slot)
  self.deletewidget.delete_close_signal.connect(lambda:self.setEnabled(True))
  self.deletewidget.delete_start_signal.connect(self.delete_start_slot)
  '''更新功能'''
  self.update_btn.clicked.connect(self.update_slot)
  self.updatewidget.update_close_signal.connect(lambda:self.setEnabled(True))
  self.updatewidget.update_name_signal.connect(self.update_name_slot)
  self.updatewidget.update_show_signal.connect(self.update_show_slot)
 def sql_init(self):
  '''
  sqllite3初始化
  '''
  try:
conn = sqlite3.connect('find.db')
cursor = conn.cursor()
cursor.execute('select * from design')
cursor.close()
conn.close()
  except:
conn = sqlite3.connect('find.db')
cursor = conn.cursor()
cursor.execute('create table design (id  integer PRIMARY KEY AUTOINCREMENT,name varchar(20),show varchar(100))')
cursor.close()
conn.close()

  '''查詢槽'''
 def find_slot(self,content):
  try:
result = self.find_func(content)
self.status_bar.showMessage('查詢成功')
if result:
 self.show_view.append('<font size="5" color="red">共查詢 {} 條數(shù)據(jù)</font>'.format(len(result)))
 for i in range(len(result)):
  self.show_view.append('id:' + str(result[i][0]))
  self.show_view.append('名稱：' + result[i][1])
  self.show_view.append('說明：' + result[i][2])
else:
 self.show_view.append('<font size="5" color="red">共查詢 {} 條數(shù)據(jù)</font>'.format(len(result)))
  except Exception as e:
self.status_bar.showMessage('查詢失敗')
print(e)

  '''添加槽'''
 def add_slot(self):
  self.addwidget.show()
  self.setEnabled(False)
 def add_start_slot(self,name,show):
  try:
self.insert_func(name,show)
self.status_bar.showMessage('添加成功')
  except Exception as e:
self.status_bar.showMessage('添加失敗')
  self.setEnabled(True)
  self.addwidget.name_text.clear()
  self.addwidget.show_text.clear()
  self.addwidget.close()

  '''刪除槽'''
 def delete_slot(self):
  self.deletewidget.show()
  self.setEnabled(False)
 def delete_start_slot(self,id):
  try:
self.delete_func(id)
self.reset_func()
self.status_bar.showMessage('刪除成功')
  except  Exception as e:
self.status_bar.showMessage('刪除失敗')
  self.setEnabled(True)
  self.deletewidget.close()

  '''更新槽'''
 def update_slot(self):
  self.updatewidget.show()
  self.setEnabled(False)
 def update_name_slot(self,id,name):
  try:
self.update_name_func(id,name)
self.status_bar.showMessage('更新名稱成功')
  except Exception as e:
self.status_bar.showMessage('更新名稱失敗')
  self.setEnabled(True)
  self.updatewidget.close()
 def update_show_slot(self,id,name):
  try:
self.update_show_func(id,name)
self.status_bar.showMessage('更新名稱成功')
  except Exception as e:
self.status_bar.showMessage('更新名稱失敗')
  self.setEnabled(True)
  self.updatewidget.close()

  '''數(shù)據(jù)庫函數(shù)'''
 def insert_func(self,name,show):
  '''
  插入信息
  '''
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute('insert into design (id,name,show) values (null,"{}","{}")'.format(name,show))
  cursor.close()
  conn.commit()
  conn.close()
 def find_func(self,content):
  '''
  查詢信息
  '''
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute('SELECT * FROM design WHERE name LIKE "%{}%"'.format(content))
  result1 = cursor.fetchall()
  cursor.close()
  conn.close()
  return result1
 def count_func(self):
  '''
  信息數(shù)目
  '''
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute('select * from design')
  result = cursor.fetchall()
  count = len(result)
  cursor.close()
  conn.close()
  return count
 def update_name_func(self,id,name):
  '''
  更新名稱信息
  '''
  print(id,name)
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute('update design set name = ? where id = ?',(name,id))
  cursor.close()
  conn.commit()
  conn.close()
 def update_show_func(self,id,name):
  '''
  更新說明信息
  '''
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute('update design set show = ? where id = ?',(name,id))
  cursor.close()
  conn.commit()
  conn.close()
 def delete_func(self,id):
  '''
  刪除信息
  '''
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute('delete from design where id = ?',(id,))
  cursor.close()
  conn.commit()
  conn.close()
 def reset_func(self):
  conn = sqlite3.connect('find.db')
  cursor = conn.cursor()
  cursor.execute("DELETE FROM sqlite_sequence WHERE name = 'design'")
  cursor.close()
  conn.commit()
  conn.close()

class AddWidget(QWidget):
 '''
 添加功能界面
 '''
 add_start_signal = pyqtSignal(str,str)
 add_close_signal = pyqtSignal()
 def __init__(self):
  super(AddWidget,self).__init__()
  self.ui_init()
  self.connect_init()
 def ui_init(self):
  self.setWindowTitle('添加信息')
  self.setFixedSize(300,200)
  self.name_text = QLineEdit()
  self.show_text = QTextEdit()
  self.start_btn = QPushButton()
  self.start_btn.setText('添加')
  self.cancel_btn = QPushButton()
  self.cancel_btn.setText('取消')
  self.name_label = QLabel()
  self.name_label.setText('名稱：')
  self.show_label = QLabel()
  self.show_label.setText('說明：')
  self.h1_layout = QHBoxLayout()
  self.h2_layout = QHBoxLayout()
  self.h3_layout = QHBoxLayout()
  self.v_layout = QVBoxLayout()
  self.h1_layout.addWidget(self.name_label)
  self.h1_layout.addWidget(self.name_text)
  self.h2_layout.addWidget(self.show_label)
  self.h2_layout.addWidget(self.show_text)
  self.h3_layout.addWidget(self.start_btn)
  self.h3_layout.addWidget(self.cancel_btn)
  self.v_layout.addLayout(self.h1_layout)
  self.v_layout.addLayout(self.h2_layout)
  self.v_layout.addLayout(self.h3_layout)
  self.setLayout(self.v_layout)
 def connect_init(self):
  self.start_btn.clicked.connect(self.start_slot)
  self.cancel_btn.clicked.connect(self.close_slot)
 def start_slot(self):
  name = self.name_text.text()
  show = self.show_text.toPlainText()
  self.add_start_signal.emit(name,show)

 def close_slot(self):
  self.close()
  self.add_close_signal.emit()
 def closeEvent(self, event):
  self.add_close_signal.emit()
  
  
class DeleteWidget(QWidget):
 '''
 刪除功能界面
 '''
 delete_cancel_signal = pyqtSignal()
 delete_start_signal = pyqtSignal(str)
 delete_close_signal = pyqtSignal()
 def __init__(self):
  super(DeleteWidget,self).__init__()
  self.ui_init()
  self.connect_init()
 def ui_init(self):
  self.setWindowTitle('刪除信息')
  self.setFixedSize(300,100)
  self.id_text = QLineEdit()
  self.start_btn = QPushButton()
  self.start_btn.setText('刪除')
  self.cancel_btn = QPushButton()
  self.cancel_btn.setText('取消')
  self.id_label = QLabel()
  self.id_label.setText('要刪除的id：')
  self.h1_layout = QHBoxLayout()
  self.h2_layout = QHBoxLayout()
  self.v_layout = QVBoxLayout()
  self.h1_layout.addWidget(self.id_label)
  self.h1_layout.addWidget(self.id_text)
  self.h2_layout.addWidget(self.start_btn)
  self.h2_layout.addWidget(self.cancel_btn)
  self.v_layout.addLayout(self.h1_layout)
  self.v_layout.addLayout(self.h2_layout)
  self.setLayout(self.v_layout)
 def connect_init(self):
  self.start_btn.clicked.connect(self.start_slot)
  self.cancel_btn.clicked.connect(self.close_slot)
 def start_slot(self):
  id = self.id_text.text()
  self.delete_start_signal.emit(id)

 def close_slot(self):
  self.close()
  self.delete_close_signal.emit()
 def closeEvent(self, event):
  self.delete_close_signal.emit()

class UpdateWidget(QWidget):
 '''
 更新功能界面
 '''
 update_name_signal = pyqtSignal(int,str)
 update_show_signal = pyqtSignal(int,str)
 update_close_signal = pyqtSignal()
 
 def __init__(self):
  super(UpdateWidget,self).__init__()
  self.ui_init()
  self.connect_init()
 def ui_init(self):
  self.setWindowTitle('修改信息')
  self.setFixedSize(300,150)
  self.content_text = QLineEdit()
  self.id_text = QLineEdit()
  self.name_btn = QPushButton()
  self.name_btn.setText('修改名稱')
  self.show_btn = QPushButton()
  self.show_btn.setText('修改說明')
  self.cancel_btn = QPushButton()
  self.cancel_btn.setText('取消')
  self.content_label = QLabel()
  self.content_label.setText('修改內(nèi)容：')
  self.id_label = QLabel()
  self.id_label.setText('選擇id為:')
  self.h1_layout = QHBoxLayout()
  self.h2_layout = QHBoxLayout()
  self.h3_layout = QHBoxLayout()
  self.v_layout = QVBoxLayout()
  self.h1_layout.addWidget(self.id_label)
  self.h1_layout.addWidget(self.id_text)
  self.h2_layout.addWidget(self.content_label)
  self.h2_layout.addWidget(self.content_text)
  self.h3_layout.addWidget(self.name_btn)
  self.h3_layout.addWidget(self.show_btn)
  self.h3_layout.addWidget(self.cancel_btn)
  self.v_layout.addLayout(self.h1_layout)
  self.v_layout.addLayout(self.h2_layout)
  self.v_layout.addLayout(self.h3_layout)
  self.setLayout(self.v_layout)
 def connect_init(self):
  self.name_btn.clicked.connect(self.update_name_slot)
  self.show_btn.clicked.connect(self.update_show_slot)
  self.cancel_btn.clicked.connect(self.close_slot)
 def update_name_slot(self):
  id = self.id_text.text()
  id = int(id)
  content = self.content_text.text()
  self.update_name_signal.emit(id,content)

 def update_show_slot(self):
  id = self.id_text.text()
  id = int(id)
  content = self.content_text.text()
  self.update_show_signal.emit(id,content)  
 def close_slot(self):
  self.close()
  self.update_close_signal.emit()
 def closeEvent(self, event):
  self.update_close_signal.emit() 
if __name__ == '__main__':
 app = QApplication(sys.argv)
 dispaly = MainWidget()
 dispaly.show()
 sys.exit(app.exec_())

展示

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