使用数据库改造学生管理系统

202221336029--网安2211

目录

1.准备工作

1.构建MYSQL数据库

2.实现功能

2.连接到数据库

3.完整代码实现

1.项目结构

2.StudentDao接口编写

3.功能实现

添加学生

删除学生

根据姓名查询学生

根据gpa，major查找学生

查找所有的学生

4.最终测试

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1.准备工作

1.构建MYSQL数据库

2.实现功能

需要实现：

1. 向数据库添加学生
2. 向数据库移除学生
3. 通过major,name,GPA寻找学生
4. 展示数据库的所有学生

2.连接到数据库

JDBCUtil类，连接上数据库

测试：

成功插入

3.完整代码实现

1.项目结构

2.StudentDao接口编写

3.功能实现

添加学生

删除学生

通过id删除学生

根据姓名查询学生

测试结果：

根据gpa，major查找学生

实际操作与根据姓名查找学生类似

直接运行测试代码：

查找所有的学生

String sql="Select * from students";返回所有内容

4.最终测试

Main代码修改

package student;

import java.util.List;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {

		/**
		 * This program is a student management system that allows users to add, remove,
		 * and search for students by name, major, and GPA. It uses the Student and
		 * StudentManagementSystem classes to store and manage student data.
		 */
		// Initialize the scanner
		Scanner scanner = new Scanner(System.in);
		StudentManagementSystem sms = new StudentManagementSystem();
		boolean running = true;
		while (running) {
			// Prompt user for input
			System.out.println("Enter 1 to add a student");
			System.out.println("Enter 2 to remove a student");
			System.out.println("Enter 3 to search for a student by name");
			System.out.println("Enter 4 to search for a student by major");
			System.out.println("Enter 5 to search for a student by GPA");
			System.out.println("Enter 6 to show all students");
			System.out.println("Enter 7 to exit");

			// Get user input
			int choice = scanner.nextInt();

			// Process user input
			switch (choice) {
			case 1:
				// Add a student
				System.out.println("Enter student name:");
				String name = scanner.next();
				System.out.println("Enter student age:");
				int age = scanner.nextInt();
				System.out.println("Enter student gender:");
				String gender = scanner.next();
				System.out.println("Enter student ID:");
				String id = scanner.next();
				System.out.println("Enter student major:");
				String major = scanner.next();
				System.out.println("Enter student GPA:");
				double gpa = scanner.nextDouble();
				Student student = new Student(name, age, gender, id, major, gpa);
				sms.writeStudent(student);
				System.out.println("Student added successfully!\n");
				break;
			case 2:
				// Remove a student
				System.out.println("Enter student ID to remove:");
				String removeId = scanner.next();
                boolean removed = sms.removeStudent(removeId);
				if (!removed) {
					System.out.println("Student not found!");
				}
                else{
                    System.out.println("Student removed successfully!\n");
                }
				break;
			case 3:
				// Search for a student by name
				System.out.println("Enter student name to search:");
				String searchName = scanner.next();
				List searchResults = sms.getStudentsByName(searchName);
				if (searchResults.isEmpty()) {
					System.out.println("No students found!");
				} else {
					System.out.println("Search results:");
					for (Student s : searchResults) {
						System.out.println(s);
					}
				}
				break;
			case 4:
				// Search for a student by major
				System.out.println("Enter student major to search:");
				String searchMajor = scanner.next();
				searchResults = sms.getStudentsByMajor(searchMajor);
				if (searchResults.isEmpty()) {
					System.out.println("No students found!");
				} else {
					System.out.println("Search results:");
					for (Student s : searchResults) {
						System.out.println(s);
					}
				}
				break;
			case 5:
				// Search for a student by GPA
				System.out.println("Enter student GPA to search:");
				double searchGpa = scanner.nextDouble();
				searchResults = sms.getStudentsByGpa(String.valueOf(searchGpa));
				if (searchResults.isEmpty()) {
					System.out.println("No students found!");
				} else {
					System.out.println("Search results:");
					for (Student s : searchResults) {
						System.out.println(s);
					}
				}
				break;
			case 6:
				// Show all Students
				List studentList = sms.getAllStudents();
				if (studentList.size() == 0) {
					System.out.println("The System Data is empty Now!");
				}else {
					for (Student studentItem : studentList) {
						System.out.println(studentItem.toString());
					}
				}
				break;
			case 7:
				// Exit the program
				running = false;
				System.out.println("Exit Successfully!");
				break;
			default:
				// Invalid input
				System.out.println("Invalid choice!");
				break;
			}
		}
		// Close scanner
		scanner.close();
	}
}

添加

查找

gpa与major查找

展示所有

删除

最终数据库：

001被删去，fjh被添加