题目描述
本次实验为连接数据库的实验，并对数据库进行一些简单的操作，要实现的基本功能如下所示，要能连接并展现数据库里的数据，能够实现插入功能。
拓展;
- 实现按学号查找学生信息功能
- 实现清空数据功能
- 实现保存数据功能
- 实现右键菜单功能
解题思路/算法分析/问题及解决
本次实验可主要分为两个部分，即数据库连接操作部分和数据可视化操作界面部分。
数据库连接部分采用python的pymysql库对数据库进行连接操作。
数据可视化部分采用tableWidget控件进行表格化的呈现，并通过相应的控件交互来实现功能。TableWidget的主要方法如下表所示：
实验代码
数据库连接
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def db_connect(self): self.db = pymysql.connect(host='localhost', user='root', password='Zwq197166', port=3306, database='test') |
可视化界面操作部分
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def inser_row(self, row, sid, name, sex, address): sid_item = QTableWidgetItem(sid) name_item = QTableWidgetItem(name) sex_item = QTableWidgetItem(sex) address_item = QTableWidgetItem(address) self.tableWidget.insertRow(row) self.tableWidget.setItem(row, 0, sid_item) self.tableWidget.setItem(row, 1, name_item) self.tableWidget.setItem(row, 2, sex_item) self.tableWidget.setItem(row, 3, address_item)
@pyqtSlot() def on_button_load_clicked(self): if self.button_save.isEnabled(): r = QMessageBox.warning(self, "警告", "是否覆盖当前表格数据", QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes) if r == QMessageBox.No: return self.tableWidget.setRowCount(0) self.tableWidget.clearContents() self.db_connect() cursor = self.db.cursor() sql = "select * from my_student;" try: cursor.execute(sql) results = cursor.fetchall() for (sid, name, sex,address) in results: print(sid, name, sex, address) row = self.tableWidget.rowCount() # print(row) self.inser_row(row, sid, name, sex, address) data[sid] = [name, sex, address] except: print("unable to fetch data")
self.db.close() self.button_save.setEnabled(True) print("load")
@pyqtSlot() def on_button_add_clicked(self): di = inputDialog() ok = di.exec_() if not ok: return name = di.line_name.text() sid = di.line_id.text() sex = di.line_sex.text() address = di.line_address.text() print(name,sid) print(type(address)) data[sid] = [name, sex, address] self.inser_row(self.tableWidget.rowCount(), sid, name, sex, address) print(data) print("add") # self.tableWidget.insertRow(self.tableWidget.rowCount()-1) self.button_save.setEnabled(True)
@pyqtSlot() def on_button_save_clicked(self): print(data) self.db_connect() cursor = self.db.cursor() try: sql = "delete from my_student;" cursor.execute(sql) # self.db.commit() for key, value in data.items(): sql = "insert into my_student(sid,name,sex,address) values('{sid}','{name}','{sex}','{address}');".format(sid=key, name=value[0], sex=value[1], address=value[2]) print(sql) cursor.execute(sql) self.db.commit() self.db.close() print("save") self.button_save.setEnabled(False) except: QMessageBox.critical(self, "错误", "数据格式有误，请检查")
@pyqtSlot() def on_button_clear_clicked(self): self.tableWidget.setRowCount(0) self.tableWidget.clearContents() data.clear() self.line_id.clear() self.button_save.setEnabled(True)
@pyqtSlot() def on_button_search_clicked(self): sid = self.line_id.text() if not sid: QMessageBox.critical(self, "警告", "请输入一个学号！") return print(sid) if sid in data: search = INFO(sid) search.exec_() # print("search") else: QMessageBox.critical(self, "错误", "该学号不存在！")
@pyqtSlot(QTableWidgetItem) def on_tableWidget_itemActivated(self, item): """ 按住Enter键时，当前选中的单元格向下 """ row = self.tableWidget.row(item) column = self.tableWidget.column(item) totalrow = self.tableWidget.rowCount()
if row + 1 < totalrow: row = self.tableWidget.row(item) + 1 self.tableWidget.setCurrentCell(row, column) elif row + 2 == totalrow: row = totalrow - 1 self.tableWidget.setCurrentCell(row, column)
@pyqtSlot(int, int) def on_tableWidget_cellDoubleClicked(self, row, column): id = self.tableWidget.item(row, 0).text() di = inputDialog(sid=id) ok = di.exec_() if not ok: return name = di.line_name.text() sid = di.line_id.text() sex = di.line_sex.text() address = di.line_address.text() print("before:", id) print("after:", sid) self.tableWidget.item(row, 0).setText(sid) self.tableWidget.item(row, 1).setText(name) self.tableWidget.item(row, 2).setText(sex) self.tableWidget.item(row, 3).setText(address) data[sid] = [name, sex, address] if id != sid: del data[id] self.button_save.setEnabled(True)
def closeEvent(self, event): if self.button_save.isEnabled(): r = QMessageBox.warning(self, "警告", "你还有操作没保存，现在保存下？", QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes) if r == QMessageBox.No: event.accept() else: event.ignore()
def context_menu(self,pos): pop_menu = QMenu() change_new_event = pop_menu.addAction("修改行") delete_event = pop_menu.addAction("删除行") action = pop_menu.exec_(self.tableWidget.mapToGlobal(pos))
if action == change_new_event: item = self.tableWidget.selectedItems() row = item[0].row() id = self.tableWidget.item(row, 0).text() di = inputDialog(sid=id) ok = di.exec_() if not ok: return name = di.line_name.text() sid = di.line_id.text() sex = di.line_sex.text() address = di.line_address.text() print("before:",id) print("after:",sid) self.tableWidget.item(row, 0).setText(sid) self.tableWidget.item(row, 1).setText(name) self.tableWidget.item(row, 2).setText(sex) self.tableWidget.item(row, 3).setText(address) data[sid] = [name, sex, address] if id != sid: del data[id] self.button_save.setEnabled(True) elif action == delete_event: r = QMessageBox.warning(self, "注意", "删除可不能恢复了哦！", QMessageBox.Yes | QMessageBox.No, QMessageBox.No) if r == QMessageBox.No: return items = self.tableWidget.selectedItems() if items: selected_rows = [] for i in items: row = i.row() if row not in selected_rows: selected_rows.append(row) selected_rows = sorted(selected_rows, reverse=True) for r in selected_rows: sid = self.tableWidget.item(r, 0).text() del data[sid] self.tableWidget.removeRow(r) self.button_save.setEnabled(True)
class inputDialog(QDialog, Ui_Dialog_input): def __init__(self, sid=None): super(inputDialog, self).__init__() self.setupUi(self) self.sid = sid self.buttonBox.accepted.connect(self.check)
if sid: self.line_id.setText(sid) self.line_name.setText(data[sid][0]) self.line_sex.setText(data[sid][1]) self.line_address.setText(data[sid][2])
def check(self): sid = self.line_id.text() name = self.line_name.text() if sid in data and self.sid not in data: r = QMessageBox.warning(self, "警告", "该学号已存在!", QMessageBox.Ok) return
if not sid: r = QMessageBox.warning(self, "警告", "学号为必填项!", QMessageBox.Ok) return
if not name: r = QMessageBox.warning(self, "警告", "姓名为必填项!", QMessageBox.Ok) return
self.accept() # print('miss')
class INFO(QDialog, Ui_Dialog_info): def __init__(self, id: str): super(INFO, self).__init__() self.setupUi(self) self.line_id.setText(id) self.line_name.setText(data[id][0]) self.line_sex.setText(data[id][1]) self.line_address.setText(data[id][2])
@pyqtSlot() def on_button_confirm_clicked(self): # print(1) self.close() |
运行结果
导入数据：
添加数据：
清空数据：
搜索数据：
修改数据：
双击修改
右键菜单修改：
删除后：
保存数据：
