2022-07-04 00:31

CourseDAO.h

@@ -10,7 +10,8 @@
 void addCourse(_ConnectionPtr connection, Course course);
 void deleteCourse(_ConnectionPtr connection, string id);
 void updateCourseName(_ConnectionPtr connection, string id, string name);
-Course& getCourseById(_ConnectionPtr connection, string id);
+Course* getCourseById(_ConnectionPtr connection, string id);
-std::vector<Course>& getCourseByName(_ConnectionPtr connection, string name);
+Course* getCourseByName(_ConnectionPtr connection, string name);
+std::vector<Course>* getAllCourse(_ConnectionPtr connection);
 
 #endif // !COURSE_DAO_H

CourseDAOImpl.cpp

@@ -19,19 +19,32 @@ void updateCourseName(_ConnectionPtr connection, string id, string name) {
 	connection->Execute(sql.c_str(), NULL, (long)0);
 }
 
-Course& getCourseById(_ConnectionPtr connection, string id) {
+Course* getCourseById(_ConnectionPtr connection, string id) {
 	string sql = "select * from course where id = '" + id + "'";
 	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
 
 	Course* course = new Course();
 	course->setId((char*)(_bstr_t)record->Fields->GetItem("id")->Value);
 	course->setName((char*)(_bstr_t)record->Fields->GetItem("name")->Value);
-	return *course;
+	return course;
 }
 
-std::vector<Course>& getCourseByName(_ConnectionPtr connection, string name) {
+Course* getCourseByName(_ConnectionPtr connection, string name) {
 	string sql = "select * from course where name = '" + name + "'";
 	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
+
+	Course* course = new Course();
+	course->setId((char*)(_bstr_t)record->Fields->GetItem("id")->Value);
+	course->setName((char*)(_bstr_t)record->Fields->GetItem("name")->Value);
+	return course;
+}
+
+std::vector<Course>* getAllCourse(_ConnectionPtr connection) {
+	string sql = "select * from course";
+	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
 
 	std::vector<Course>* v = new std::vector<Course>();
 	Course* course;
@@ -41,5 +54,5 @@ std::vector<Course>& getCourseByName(_ConnectionPtr connection, string name) {
 		course->setName((char*)(_bstr_t)record->Fields->GetItem("name")->Value);
 		v->push_back(*course);
 	}
-	return *v;
+	return v;
 }

GradeDAO.h

@@ -12,8 +12,16 @@ void deleteOnesGrade(_ConnectionPtr connection, string stuId,string courseId);
 void deleteGradeByStuId(_ConnectionPtr connection, string stuId);
 void deleteGradeByCourseId(_ConnectionPtr connection, string courseId);
 void updateOnesGrade(_ConnectionPtr connection, string stuId, string courseId, string grade);
-Grade& getOnesGrade(_ConnectionPtr connection, string stuId, string courseId);
+Grade* getOnesGrade(_ConnectionPtr connection, string stuId, string courseId);
-std::vector<Grade>& getGradeByStuId(_ConnectionPtr connection, string stuId);
+std::vector<Grade>* getGradeByStuId(_ConnectionPtr connection, string stuId);
-std::vector<Grade>& getGradeByCourseId(_ConnectionPtr connection, string courseId);
+std::vector<Grade>* getGradeByCourseId(_ConnectionPtr connection, string courseId);
+std::vector<Grade>* getGradeByStuClass(_ConnectionPtr connection, string stuClass);
+std::vector<Grade>* getAllGrade(_ConnectionPtr connection);
+
+double getOnesAvgGrade(_ConnectionPtr connection, string stuId);
+double getOnesAllGrade(_ConnectionPtr connection, string stuId);
+double getClassAvgGrade(_ConnectionPtr connection, string stuClass, string courseName);
+double getClassMaxGrade(_ConnectionPtr connection, string stuClass, string courseName);
+double getClassMinGrade(_ConnectionPtr connection, string stuClass, string courseName);
 
 #endif // !GRADE_DAO_H

GradeDAOImpl.cpp

@@ -32,20 +32,22 @@ void updateOnesGrade(_ConnectionPtr connection, string stuId, string courseId, s
 	connection->Execute(sql.c_str(), NULL, (long)0);
 }
 
-Grade& getOnesGrade(_ConnectionPtr connection, string stuId,string courseId) {
+Grade* getOnesGrade(_ConnectionPtr connection, string stuId,string courseId) {
 	string sql = "select * from grade where stuId = '" + stuId + "\' and courseId = \'" + courseId + "'";
 	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
 
 	Grade* grade = new Grade();
 	grade->setStuId((char*)(_bstr_t)record->Fields->GetItem("stuId")->Value);
 	grade->setCourseId((char*)(_bstr_t)record->Fields->GetItem("courseId")->Value);
 	grade->setGrade((char*)(_bstr_t)record->Fields->GetItem("grade")->Value);
-	return *grade;
+	return grade;
 }
 
-std::vector<Grade>& getGradeByStuId(_ConnectionPtr connection, string stuId) {
+std::vector<Grade>* getGradeByStuId(_ConnectionPtr connection, string stuId) {
 	string sql = "select * from grade where stuId = '" + stuId + "'";
 	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
 
 	std::vector<Grade>* v = new std::vector<Grade>();
 	Grade* grade;
@@ -56,12 +58,13 @@ std::vector<Grade>& getGradeByStuId(_ConnectionPtr connection, string stuId) {
 		grade->setGrade((char*)(_bstr_t)record->Fields->GetItem("grade")->Value);
 		v->push_back(*grade);
 	}
-	return *v;
+	return v;
 }
 
-std::vector<Grade>& getGradeByCourseId(_ConnectionPtr connection, string courseId) {
+std::vector<Grade>* getGradeByCourseId(_ConnectionPtr connection, string courseId) {
 	string sql = "select * from grade where courseId = '" + courseId + "'";
 	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
 
 	std::vector<Grade>* v = new std::vector<Grade>();
 	Grade* grade;
@@ -72,5 +75,84 @@ std::vector<Grade>& getGradeByCourseId(_ConnectionPtr connection, string courseI
 		grade->setGrade((char*)(_bstr_t)record->Fields->GetItem("grade")->Value);
 		v->push_back(*grade);
 	}
-	return *v;
+	return v;
+}
+
+std::vector<Grade>* getGradeByStuClass(_ConnectionPtr connection, string stuClass) {
+	string sql = "select * from grade where stuId in(select id from student where stuClass = '" + stuClass + "')";
+	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
+
+	std::vector<Grade>* v = new std::vector<Grade>();
+	Grade* grade;
+	for (; !record->EndOfFile; record->MoveNext()) {
+		grade = new Grade();
+		grade->setStuId((char*)(_bstr_t)record->Fields->GetItem("stuId")->Value);
+		grade->setCourseId((char*)(_bstr_t)record->Fields->GetItem("courseId")->Value);
+		grade->setGrade((char*)(_bstr_t)record->Fields->GetItem("grade")->Value);
+		v->push_back(*grade);
+	}
+	return v;
+}
+
+std::vector<Grade>* getAllGrade(_ConnectionPtr connection) {
+	string sql = "select * from grade";
+	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
+
+	std::vector<Grade>* v = new std::vector<Grade>();
+	Grade* grade;
+	for (; !record->EndOfFile; record->MoveNext()) {
+		grade = new Grade();
+		grade->setStuId((char*)(_bstr_t)record->Fields->GetItem("stuId")->Value);
+		grade->setCourseId((char*)(_bstr_t)record->Fields->GetItem("courseId")->Value);
+		grade->setGrade((char*)(_bstr_t)record->Fields->GetItem("grade")->Value);
+		v->push_back(*grade);
+	}
+	return v;
+}
+
+double getOnesAvgGrade(_ConnectionPtr connection, string stuId) {
+	string sql = "select count(*) cnt,sum(grade) all_grade from grade where stuId = '" + stuId + "'";
+	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
+
+	int cnt = atoi((char*)(_bstr_t)record->Fields->GetItem("cnt")->Value);
+	double all_grade = atof((char*)(_bstr_t)record->Fields->GetItem("all_grade")->Value);
+	return all_grade / cnt;
+}
+
+double getOnesAllGrade(_ConnectionPtr connection, string stuId) {
+	string sql = "select sum(grade) all_grade from grade where stuId = '" + stuId + "'";
+	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
+
+	return atof((char*)(_bstr_t)record->Fields->GetItem("all_grade")->Value);
+}
+
+double getClassAvgGrade(_ConnectionPtr connection, string stuClass, string courseName) {
+	string sql = "select avg(grade) avg_grade from grade where stuId in (select id from student where stuClass = '" + stuClass + "') ";
+	sql += "and courseId in (select id from course where name = '" + courseName + "')";
+	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
+
+	return atof((char*)(_bstr_t)record->Fields->GetItem("avg_grade")->Value);
+}
+
+double getClassMaxGrade(_ConnectionPtr connection, string stuClass, string courseName) {
+	string sql = "select max(grade) max_grade from grade where stuId in (select id from student where stuClass = '" + stuClass + "') ";
+	sql += "and courseId in (select id from course where name = '" + courseName + "')";
+	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
+
+	return atof((char*)(_bstr_t)record->Fields->GetItem("max_grade")->Value);
+}
+
+double getClassMinGrade(_ConnectionPtr connection, string stuClass, string courseName) {
+	string sql = "select min(grade) min_grade from grade where stuId in (select id from student where stuClass = '" + stuClass + "') ";
+	sql += "and courseId in (select id from course where name = '" + courseName + "')";
+	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
+
+	return atof((char*)(_bstr_t)record->Fields->GetItem("min_grade")->Value);
 }

Menu.cpp

@@ -0,0 +1,431 @@
+#include<iostream>
+#include"Menu.h"
+#include"MenuUtils.h"
+#include"StudentDAO.h"
+#include"GradeDAO.h"
+#include"CourseDAO.h"
+using namespace std;
+
+void mainMenu(_ConnectionPtr connection) {
+	system("cls");
+	printf("1.显示所有学生\n");
+	printf("2.增加学生\n");
+	printf("3.删除学生\n");
+	printf("4.修改学生\n");
+	printf("5.从文件导入学生信息\n");
+	printf("6.导出学生信息到文件\n");
+	printf("7.学生成绩管理\n");
+	printf("8.课程管理\n");
+	printf("0.退出\n");
+
+	int opt = -1;
+	checkOptInput(opt, 0, 8);
+
+	switch (opt){
+		case 1:
+			showAllStudent(connection);
+			break;
+		case 2:
+			insertStudent(connection);
+			break;
+		case 3:
+			deleteStudent(connection);
+			break;
+		case 4:
+			changeStudent(connection);
+			break;
+		case 5:
+			importData(connection);
+			break;
+		case 6:
+			exportData(connection);
+			break;
+		case 7:
+			studentGradeMenu(connection);
+			break;
+		case 8:
+			courseMenu(connection);
+			break;
+		default:
+			exit(EXIT_SUCCESS);
+	}
+	printf("\n");
+}
+
+void studentGradeMenu(_ConnectionPtr connection) {
+	while (true) {
+		system("cls");
+		printf("1.输入学生成绩\n");
+		printf("2.获取学生平均成绩\n");
+		printf("3.获取学生总成绩\n");
+		printf("4.获取班级平均分\n");
+		printf("5.获取班级最高分\n");
+		printf("6.获取班级最低分\n");
+		printf("7.获取班级成绩\n");
+		printf("8.二级拓展菜单\n");
+		printf("0.返回上一级\n");
+
+		int opt = -1;
+		checkOptInput(opt, 0, 8);
+
+		printf("\n");
+
+		string stuId, courseId;
+		string stuClass, courseName;
+		double grade = -1;
+		int size;
+		vector<Grade> *v;
+		switch (opt) {
+			case 1://输入学生成绩
+				printf("请输入学号：");
+				cin >> stuId;
+				printf("请输入课程名：");
+				cin >> courseId;
+				printf("请输入分数(0-100)：");
+				while (!(cin >> grade) || (opt < 0) || (opt > 100)) {
+					cout << "输入错误！请重新输入：";
+					cin.clear();
+					while (cin.get() != '\n');
+				}
+				addGrade(connection, *new Grade(stuId, courseId, doubleToString(grade)));
+				printf("添加成功！\n");
+				break;
+			case 2://获取学生平均成绩
+				printf("请输入学号：");
+				cin >> stuId;
+				printf("学生平均成绩为：%.2lf\n", getOnesAvgGrade(connection, stuId));
+				break;
+			case 3://获取学生总成绩
+				printf("请输入学号：");
+				cin >> stuId;
+				printf("学生总成绩为：%.2lf\n", getOnesAllGrade(connection, stuId));
+				break;
+			case 4://获取班级平均分
+				printf("请输入班级：");
+				cin >> stuClass;
+				printf("请输入课程名：");
+				cin >> courseName;
+				cout << stuClass << "班级" << courseName << "课程的平均分为：" << getClassAvgGrade(connection, stuClass, courseName) << "\n";
+				break;
+			case 5://获取班级最高分
+				printf("请输入班级：");
+				cin >> stuClass;
+				printf("请输入课程名：");
+				cin >> courseName;
+				cout << stuClass << "班级" << courseName << "课程的最高分为：" << getClassMaxGrade(connection, stuClass, courseName) << "\n";
+				break;
+			case 6://获取班级最低分
+				printf("请输入班级：");
+				cin >> stuClass;
+				printf("请输入课程名：");
+				cin >> courseName;
+				cout << stuClass << "班级" << courseName << "课程的最低分为：" << getClassMinGrade(connection, stuClass, courseName) << "\n";
+				break;
+			case 7://获取班级成绩
+				printf("请输入班级：");
+				cin >> stuClass;
+				v = getGradeByStuClass(connection, stuClass);
+				if (v == NULL) {
+					printf("该班级不存在！\n");
+					break;
+				}
+				size = v->size();
+				cout << "学号\t" << "课程名\t" << "成绩\n";
+				for (int i = 0; i < size; i++) {
+					cout << (*v)[i].getStuId() << "\t" << getCourseById(connection, (*v)[i].getCourseId())->getName() << "\t" << (*v)[i].getGradeStr() << "\n";
+				}
+				break;
+			case 8://二级拓展菜单
+				studentGradeExternMenu(connection);
+				break;
+			default://返回上一级
+				return;
+		}
+		system("pause");
+	}
+}
+
+void studentGradeExternMenu(_ConnectionPtr connection) {
+	while (true) {
+		system("cls");
+		printf("1.删除某学生某科成绩\n");
+		printf("2.删除某学生成绩\n");
+		printf("3.删除某科成绩\n");
+		printf("4.更改某学生某科成绩\n");
+		printf("5.查询某学生某科成绩\n");
+		printf("6.查询某学生成绩\n");
+		printf("7.查询某科成绩\n");
+		printf("8.查询所有成绩\n");
+		printf("0.返回上一级\n");
+
+		int opt = -1;
+		checkOptInput(opt, 0, 8);
+
+		printf("\n");
+
+		string stuId, courseId;
+		string stuClass, courseName;
+		double grade = -1;
+		int size;
+		vector<Grade> *v;
+		Grade* gra;
+		Course* course;
+		switch (opt) {
+			case 1://删除某学生某科成绩
+				printf("请输入学号：");
+				cin >> stuId;
+				printf("请输入课程名：");
+				cin >> courseName;
+				course = getCourseByName(connection, courseName);
+				if (course == NULL) {
+					printf("该课程不存在！\n");
+					break;
+				}
+				deleteOnesGrade(connection, stuId, course->getId());
+				printf("删除成功！\n");
+				break;
+			case 2://删除某学生成绩
+				printf("请输入学号：");
+				cin >> stuId;
+				deleteGradeByStuId(connection, stuId);
+				printf("删除成功！\n");
+				break;
+			case 3://删除某科成绩
+				printf("请输入课程名：");
+				cin >> courseName;
+				course = getCourseByName(connection, courseName);
+				if (course == NULL) {
+					printf("该课程不存在！\n");
+					break;
+				}
+				deleteGradeByCourseId(connection, course->getId());
+				printf("删除成功！\n");
+				break;
+			case 4://更改某学生某科成绩
+				printf("请输入学号：");
+				cin >> stuId;
+				printf("请输入课程名：");
+				cin >> courseName;
+				course = getCourseByName(connection, courseName);
+				if (course == NULL) {
+					printf("该课程不存在！\n");
+					break;
+				}
+				printf("请输入新分数(0-100)：");
+				while (!(cin >> grade) || (opt < 0) || (opt > 100)) {
+					cout << "输入错误！请重新输入：";
+					cin.clear();
+					while (cin.get() != '\n');
+				}
+				updateOnesGrade(connection, stuId, course->getId(), doubleToString(grade));
+				printf("更改成功！\n");
+				break;
+			case 5://查询某学生某科成绩
+				printf("请输入学号：");
+				cin >> stuId;
+				printf("请输入课程名：");
+				cin >> courseName;
+				course = getCourseByName(connection, courseName);
+				if (course == NULL) {
+					printf("该课程不存在！\n");
+					break;
+				}
+				gra = getOnesGrade(connection, stuId, course->getId());
+				if (gra == NULL) {
+					printf("该条记录不存在！\n");
+					break;
+				}
+				cout << "学号\t" << "课程名\t" << "成绩\n";
+				cout << (*gra).getStuId() << "\t" << getCourseById(connection, (*gra).getCourseId())->getName() << "\t" << (*gra).getGradeStr() << "\n";
+				break;
+			case 6://查询某学生成绩
+				printf("请输入学号：");
+				cin >> stuId;
+				v = getGradeByStuId(connection, stuId);
+				if (v == NULL) {
+					printf("该学生不存在！\n");
+					break;
+				}
+				size = v->size();
+				cout << "学号\t" << "课程名\t" << "成绩\n";
+				for (int i = 0; i < size; i++) {
+					cout << (*v)[i].getStuId() << "\t" << getCourseById(connection, (*v)[i].getCourseId())->getName() << "\t" << (*v)[i].getGradeStr() << "\n";
+				}
+				break;
+			case 7://查询某科成绩
+				printf("请输入课程名：");
+				cin >> courseName;
+				course = getCourseByName(connection, courseName);
+				if (course == NULL) {
+					printf("该课程不存在！\n");
+					break;
+				}
+				v = getGradeByCourseId(connection, course->getId());
+				if (v == NULL) {
+					printf("该课程不存在对应成绩！\n");
+					break;
+				}
+				size = v->size();
+				cout << "学号\t" << "课程名\t" << "成绩\n";
+				for (int i = 0; i < size; i++) {
+					cout << (*v)[i].getStuId() << "\t" << getCourseById(connection, (*v)[i].getCourseId())->getName() << "\t" << (*v)[i].getGradeStr() << "\n";
+				}
+				break;
+			case 8://查询所有成绩
+				v = getAllGrade(connection);
+				if (v == NULL) {
+					printf("无成绩记录！\n");
+					break;
+				}
+				size = v->size();
+				cout << "学号\t" << "课程名\t" << "成绩\n";
+				for (int i = 0; i < size; i++) {
+					cout << (*v)[i].getStuId() << "\t" << getCourseById(connection, (*v)[i].getCourseId())->getName() << "\t" << (*v)[i].getGradeStr() << "\n";
+				}
+				break;
+			default://返回上一级
+				return;
+		}
+		system("pause");
+	}
+}
+
+void courseMenu(_ConnectionPtr connection) {
+	while (true) {
+		system("cls");
+		printf("1.添加课程\n");
+		printf("2.删除课程\n");
+		printf("3.更改课程\n");
+		printf("4.查询所有课程\n");
+		printf("0.返回上一级\n");
+		int opt = -1;
+		checkOptInput(opt, 0, 8);
+
+		printf("\n");
+
+		int size;
+		string courseId, courseName;
+		vector<Course>* v;
+		switch (opt) {
+			case 1://添加课程
+				printf("请输入课程号：");
+				cin >> courseId;
+				printf("请输入课程名：");
+				cin >> courseName;
+				addCourse(connection,*new Course(courseId, courseName));
+				printf("添加成功！\n");
+				break;
+			case 2://删除课程
+				printf("请输入课程号：");
+				cin >> courseId;
+				deleteCourse(connection, courseId);
+				printf("删除成功！\n");
+				break;
+			case 3://更改课程
+				printf("请输入课程号：");
+				cin >> courseId;
+				printf("请输入课程名：");
+				cin >> courseName;
+				updateCourseName(connection, courseId,courseName);
+				printf("更新成功！\n");
+				break;
+			case 4://查询所有课程
+				v = getAllCourse(connection);
+				if (v == NULL) {
+					printf("不存在课程记录！\n");
+					break;
+				}
+				size = v->size();
+				cout << "课程号\t" << "课程名\n";
+				for (int i = 0; i < size; i++) {
+					cout << (*v)[i].getId() << "\t" << (*v)[i].getName() << "\n";
+				}
+				break;
+			default://返回上一级
+				return;
+		}
+		system("pause");
+	}
+}
+
+void showAllStudent(_ConnectionPtr connection) {
+	vector<Student> vs = *getAllStudent(connection);
+	int size = vs.size();
+	for (int i = 0; i < size; i++) {
+		cout << vs[i].toString() << "\n";
+	}
+}
+
+void insertStudent(_ConnectionPtr connection) {
+	Student *stu = new Student();
+	
+	string str;
+	printf("请输入学号：");
+	cin >> str;
+	stu->setId(str);
+	printf("请输入姓名：");
+	cin >> str;
+	stu->setName(str);
+	printf("请输入性别：");
+	cin >> str;
+	stu->setSex(str);
+	printf("请输入班级：");
+	cin >> str;
+	stu->setStuClass(str);
+	printf("请输入学生状态(在读、休学、退学)：");
+	cin >> str;
+	stu->setStatus(str);
+
+	addStudent(connection, *stu);
+	printf("添加成功！\n");
+}
+
+void deleteStudent(_ConnectionPtr connection) {
+	string id;
+	printf("请输入待删除学生的学号：");
+	cin >> id;
+	Student *stu = getStudentById(connection,id);
+	if (stu == NULL) {
+		printf("该学生不存在！\n");
+		return;
+	}
+	deleteStudent(connection, id);
+	printf("删除成功！\n");
+}
+
+void changeStudent(_ConnectionPtr connection) {
+	string id;
+	printf("请输入待修改学生的学号：");
+	cin >> id;
+	Student* stu = getStudentById(connection, id);
+	if (stu == NULL) {
+		printf("该学生不存在！\n");
+		return;
+	}
+
+	printf("请选择修改 班级(0) / 学生状态(1)：");
+	int opt = -1;
+	checkOptInput(opt, 0, 1);
+
+	string input;
+	switch (opt) {
+		case 0:
+			printf("\n请输入新班级：");
+			cin >> input;
+			updateStudentClass(connection,id,input);
+			break;
+		default:
+			printf("\n请输入新状态：");
+			cin >> input;
+			updateStudentStatus(connection,id, input);
+			break;
+	}
+}
+
+void exportData(_ConnectionPtr connection) {
+
+}
+
+void importData(_ConnectionPtr connection) {
+
+}

Menu.h

@@ -0,0 +1,24 @@
+#ifndef MENU_H
+#define MENU_H
+
+#import "c:\\Program Files\\Common Files\\System\\ado\\msado15.dll" no_namespace rename("EOF", "EndOfFile")
+
+#include<vector>
+#include"Student.cpp"
+#include"Course.cpp"
+#include"Grade.cpp"
+
+void mainMenu(_ConnectionPtr connection);
+void studentGradeMenu(_ConnectionPtr connection);
+void studentGradeExternMenu(_ConnectionPtr connection);
+void courseMenu(_ConnectionPtr connection);
+
+void showAllStudent(_ConnectionPtr connection);
+void insertStudent(_ConnectionPtr connection);
+void deleteStudent(_ConnectionPtr connection);
+void changeStudent(_ConnectionPtr connection);
+
+void exportData(_ConnectionPtr connection);
+void importData(_ConnectionPtr connection);
+
+#endif // !MENU_H

MenuUtils.cpp

@@ -0,0 +1,29 @@
+#include"MenuUtils.h"
+
+void checkOptInput(int& opt, int low, int high) {
+	printf(">>>请输入选项(%d-%d)：", low, high);
+	while (!(cin >> opt) || (opt < low) || (opt > high)) {
+		cout << "输入选项错误！请重新输入：";
+		cin.clear();
+		while (cin.get() != '\n');
+	}
+}
+
+string doubleToString(double num) {
+	char* buf;
+	int dec, sign;
+
+	buf = _fcvt(num, 2, &dec, &sign);
+
+	string str;
+	if (sign) str += "-";
+	int i;
+	for (i = 0; i < dec; i++) {
+		str += buf[i];
+	}
+	str += ".";
+	for (; i < strlen(buf); i++) {
+		str += buf[i];
+	}
+	return str;
+}

MenuUtils.h

@@ -0,0 +1,12 @@
+#ifndef MENU_UTILS_H
+#define MENU_UTILS_H
+#define _CRT_SECURE_NO_WARNINGS
+
+#include<stdio.h>
+#include<iostream>
+using namespace std;
+
+void checkOptInput(int& opt, int low, int high);
+string doubleToString(double num);
+
+#endif // !MENU_UTILS_H

SAS.vcxproj

@@ -133,6 +133,8 @@
     <ClCompile Include="Grade.cpp" />
     <ClCompile Include="GradeDAOImpl.cpp" />
     <ClCompile Include="main.cpp" />
+    <ClCompile Include="Menu.cpp" />
+    <ClCompile Include="MenuUtils.cpp" />
     <ClCompile Include="Student.cpp" />
     <ClCompile Include="StudentDAOImpl.cpp" />
     <ClCompile Include="Test.cpp" />
@@ -141,6 +143,8 @@
     <ClInclude Include="CourseDAO.h" />
     <ClInclude Include="DBCUtils.h" />
     <ClInclude Include="GradeDAO.h" />
+    <ClInclude Include="Menu.h" />
+    <ClInclude Include="MenuUtils.h" />
     <ClInclude Include="StudentDAO.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />

SAS.vcxproj.filters

@@ -42,6 +42,12 @@
     <ClCompile Include="Test.cpp">
       <Filter>源文件</Filter>
     </ClCompile>
+    <ClCompile Include="Menu.cpp">
+      <Filter>源文件</Filter>
+    </ClCompile>
+    <ClCompile Include="MenuUtils.cpp">
+      <Filter>源文件</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="DBCUtils.h">
@@ -56,5 +62,11 @@
     <ClInclude Include="GradeDAO.h">
       <Filter>头文件</Filter>
     </ClInclude>
+    <ClInclude Include="Menu.h">
+      <Filter>头文件</Filter>
+    </ClInclude>
+    <ClInclude Include="MenuUtils.h">
+      <Filter>头文件</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>

StudentDAO.h

@@ -11,7 +11,8 @@ void addStudent(_ConnectionPtr connection, Student student);
 void deleteStudent(_ConnectionPtr connection, string id);
 void updateStudentClass(_ConnectionPtr connection, string id, string stuClass);
 void updateStudentStatus(_ConnectionPtr connection, string id, string status);
-Student& getStudentById(_ConnectionPtr connection, string id);
+Student* getStudentById(_ConnectionPtr connection, string id);
-std::vector<Student>& getStudentByName(_ConnectionPtr connection, string name);
+std::vector<Student>* getStudentByName(_ConnectionPtr connection, string name);
+std::vector<Student>* getAllStudent(_ConnectionPtr connection);
 
 #endif // !STUDENT_DAO_H

StudentDAOImpl.cpp

@@ -28,9 +28,10 @@ void updateStudentStatus(_ConnectionPtr connection, string id, string status) {
 	connection->Execute(sql.c_str(), NULL, (long)0);
 }
 
-Student& getStudentById(_ConnectionPtr connection, string id) {
+Student* getStudentById(_ConnectionPtr connection, string id) {
 	string sql = "select * from student where id = '" + id + "'";
 	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
 
 	Student *student = new Student();
 	student->setId((char*)(_bstr_t)record->Fields->GetItem("id")->Value);
@@ -38,12 +39,13 @@ Student& getStudentById(_ConnectionPtr connection, string id) {
 	student->setSex((char*)(_bstr_t)record->Fields->GetItem("sex")->Value);
 	student->setStuClass((char*)(_bstr_t)record->Fields->GetItem("stuClass")->Value);
 	student->setStatus((char*)(_bstr_t)record->Fields->GetItem("status")->Value);
-	return *student;
+	return student;
 }
 
-std::vector<Student>& getStudentByName(_ConnectionPtr connection, string name) {
+std::vector<Student>* getStudentByName(_ConnectionPtr connection, string name) {
 	string sql = "select * from student where name = '" + name + "'";
 	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
 
 	std::vector<Student> *v = new std::vector<Student>();
 	Student* student;
@@ -56,5 +58,24 @@ std::vector<Student>& getStudentByName(_ConnectionPtr connection, string name) {
 		student->setStatus((char*)(_bstr_t)record->Fields->GetItem("status")->Value);
 		v->push_back(*student);
 	}
-	return *v;
+	return v;
+}
+
+std::vector<Student>* getAllStudent(_ConnectionPtr connection) {
+	string sql = "select * from student";
+	_RecordsetPtr record = connection->Execute(sql.c_str(), NULL, (long)0);
+	if (record->BOF == -1) return NULL;
+
+	std::vector<Student>* v = new std::vector<Student>();
+	Student* student;
+	for (; !record->EndOfFile; record->MoveNext()) {
+		student = new Student();
+		student->setId((char*)(_bstr_t)record->Fields->GetItem("id")->Value);
+		student->setName((char*)(_bstr_t)record->Fields->GetItem("name")->Value);
+		student->setSex((char*)(_bstr_t)record->Fields->GetItem("sex")->Value);
+		student->setStuClass((char*)(_bstr_t)record->Fields->GetItem("stuClass")->Value);
+		student->setStatus((char*)(_bstr_t)record->Fields->GetItem("status")->Value);
+		v->push_back(*student);
+	}
+	return v;
 }

main.cpp

@@ -7,6 +7,7 @@
 #include <vector>
 #include "DBCUtils.h"
 #include "StudentDAO.h"
+#include "Menu.h"
 using namespace std;
 
 //高级功能 直接输入sql语句
@@ -22,13 +23,16 @@ int main() {
     _ConnectionPtr pconnect(_uuidof(Connection));
 
     if (getConnection(pwd, pconnect)) {
+        while (true) {
             try {
-            
+                mainMenu(pconnect);
-        }catch (_com_error& err) {
+            }
+            catch (_com_error& err) {
                 wprintf(L"The application throws the error: %s\n", (wchar_t*)err.ErrorMessage());
                 wprintf(L"Description = %s\n", (wchar_t*)err.Description());
             }
         }
+    }
     CoUninitialize();
     return 0;
 }