Python PyQt5实战项目之查询器的实现流程详解

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('信息查询')
        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('查询')
        self.update_btn = QPushButton()
        self.update_btn.setText('更改')
        self.delete_btn = QPushButton()
        self.delete_btn.setText('删除')
        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):
        '''
        信号与槽
        '''
        '''查询功能'''
        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)
        
        '''删除功能'''
        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()


        '''查询槽'''
    def find_slot(self,content):
        try:
            result = self.find_func(content)
            self.status_bar.showMessage('查询成功')
            if result:
                self.show_view.append('<font size="5" color="red">共查询 {} 条数据</font>'.format(len(result)))
                for i in range(len(result)):
                    self.show_view.append('id:' + str(result[i][0]))
                    self.show_view.append('名称：' + result[i][1])
                    self.show_view.append('说明：' + result[i][2])
            else:
                self.show_view.append('<font size="5" color="red">共查询 {} 条数据</font>'.format(len(result)))
        except Exception as e:
            self.status_bar.showMessage('查询失败')
            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('添加失败')
        self.setEnabled(True)
        self.addwidget.name_text.clear()
        self.addwidget.show_text.clear()
        self.addwidget.close()


        '''删除槽'''
    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('删除成功')
        except  Exception as e:
            self.status_bar.showMessage('删除失败')
        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('更新名称成功')
        except Exception as e:
            self.status_bar.showMessage('更新名称失败')
        self.setEnabled(True)
        self.updatewidget.close()

    def update_show_slot(self,id,name):
        try:
            self.update_show_func(id,name)
            self.status_bar.showMessage('更新名称成功')
        except Exception as e:
            self.status_bar.showMessage('更新名称失败')
        self.setEnabled(True)
        self.updatewidget.close()


        '''数据库函数'''
    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):
        '''
        查询信息
        '''
        conn = sqlite3.connect('find.db')
        cursor = conn.cursor()
        cursor.execute('SELECT * F<i style="color:transparent">本文来源gaodai$ma#com搞$代*码*网(</i>ROM design WHERE name LIKE "%{}%"'.format(content))
        result1 = cursor.fetchall()
        cursor.close()
        conn.close()
        return result1

    def count_func(self):
        '''
        信息数目
        '''
        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):
        '''
        更新名称信息
        '''
        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):
        '''
        更新说明信息
        '''
        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):
        '''
        删除信息
        '''
        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):
    	'''
		自增列归零
		'''
        conn = sqlite3.connect('find.db')
        cursor = conn.cursor()
        cursor.execute("DELETE FROM sqlite_sequence WHERE name = 'design'")
        cursor.close()
        conn.commit()
        conn.close()