简单学生管理系统
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package edu.gjq.controller;
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import edu.gjq.pojo.Course;
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import edu.gjq.service.CourseService;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Controller;
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import org.springframework.ui.Model;
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import org.springframework.web.bind.annotation.*;
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import java.util.List;
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@Controller
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public class CourseController {
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private final CourseService courseService;
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@Autowired
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public CourseController(CourseService courseService) {
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this.courseService = courseService;
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}
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// 加载课程页面
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@GetMapping("/coursepage")
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public String getCoursePage(){
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return "course";
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}
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// 处理数据
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@GetMapping("/courses")
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public String getAllCourses(Model model){
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List<Course> courses = courseService.getAllCourses();
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model.addAttribute("courses",courses);
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return "course";
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}
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@GetMapping("/addcoursepage")
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public String addCoursePage(){
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return "addcourse";
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}
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@PostMapping("/addcourse")
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public String addCourse(@ModelAttribute Course course) {
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courseService.addCourse(course);
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return "redirect:/courses";
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}
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@GetMapping("/updatecoursepage/{id}")
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public String updateCoursePage(@PathVariable String id, Model model){
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Course course = courseService.getCourseById(id);
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model.addAttribute("course",course);
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return "updatecourses";
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}
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@PostMapping("/updatecourse")
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public String updateCourse(@ModelAttribute Course course) {
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courseService.updateCourse(course);
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return "redirect:/courses";
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}
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@GetMapping("/deletecourse/{id}")
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public String deleteCourse(@PathVariable String id) {
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courseService.deleteCourse(id);
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return "redirect:/courses";
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}
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// 查询课程学生选课情况
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@GetMapping("/enrollments/{courseId}")
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public String getEnrollments(@PathVariable String courseId, Model model) {
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// 假设有一个方法 getEnrollmentsByCourseId 来获取选课情况
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// 这里需要根据实际的业务逻辑来实现
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List<?> enrollments = courseService.getEnrollmentsByCourseId(courseId);
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model.addAttribute("enrollments", enrollments);
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return "enrollments";
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}
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}
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package edu.gjq.mapper;
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import edu.gjq.pojo.Course;
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import edu.gjq.pojo.Enrollment;
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import java.util.List;
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public interface CourseMapper {
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// 查询全部课程信息
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List<Course> getAll();
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// 根据id查询课程
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Course getById(String id);
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// 添加课程
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void insertCourse(Course course);
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// 更新课程
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void update(Course course);
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// 删除课程
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void deleteById(String id);
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// 查询课程学生选课情况
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List<Enrollment> getEnrollmentsByCourseId(String courseId);
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}
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package edu.gjq.pojo;
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import lombok.Data;
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@Data
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public class Enrollment {
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private String studentId; // 学生ID
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private String studentName; // 学生姓名
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private Integer courseId; // 课程ID
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private String courseName; // 课程名称
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}
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package edu.gjq.service;
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import edu.gjq.pojo.Course;
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import edu.gjq.pojo.Enrollment;
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import java.util.List;
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public interface CourseService {
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List<Course> getAllCourses();
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void addCourse(Course course);
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Course getCourseById(String id);
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void updateCourse(Course course);
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void deleteCourse(String id);
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List<Enrollment> getEnrollmentsByCourseId(String courseId);
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}
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package edu.gjq.service.impl;
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import edu.gjq.mapper.CourseMapper;
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import edu.gjq.pojo.Course;
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import edu.gjq.pojo.Enrollment;
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import edu.gjq.service.CourseService;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Service;
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import java.util.List;
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@Service
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public class CourseServiceImpl implements CourseService {
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private final CourseMapper courseMapper;
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@Autowired
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public CourseServiceImpl(CourseMapper courseMapper) {
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this.courseMapper = courseMapper;
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}
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@Override
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public List<Course> getAllCourses() {
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return courseMapper.getAll();
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}
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@Override
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public void addCourse(Course course) {
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courseMapper.insertCourse(course);
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}
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@Override
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public Course getCourseById(String id) {
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return courseMapper.getById(id);
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}
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@Override
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public void updateCourse(Course course) {
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courseMapper.update(course);
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}
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@Override
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public void deleteCourse(String id) {
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courseMapper.deleteById(id);
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}
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@Override
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public List<Enrollment> getEnrollmentsByCourseId(String courseId) {
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return (List<Enrollment>) courseMapper.getEnrollmentsByCourseId(courseId);
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}
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}
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<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"https://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="edu.gjq.mapper.CourseMapper">
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<!-- 通用查询语句 -->
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<sql id="commonSelect">
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select id, name
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from course
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</sql>
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<!-- 查询所有课程 -->
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<select id="getAll" resultType="Course">
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<include refid="commonSelect"/>
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</select>
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<!-- 根据id查询课程 -->
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<select id="getById" resultType="Course">
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<include refid="commonSelect"/>
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<where>
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id = #{id}
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</where>
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</select>
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<!-- 插入课程 -->
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<insert id="insertCourse" parameterType="Course">
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insert into course (id, name) values (#{id}, #{name})
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</insert>
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<!-- 更新课程 -->
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<update id="update">
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update course
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<set>
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<if test="name != null">name = #{name},</if>
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</set>
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where id = #{id}
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</update>
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<!-- 删除课程 -->
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<delete id="deleteById">
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delete from course where id = #{id}
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</delete>
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<!-- 查询课程学生选课情况 -->
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<select id="getEnrollmentsByCourseId" resultType="Enrollment">
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SELECT s.id as student_id, s.name as student_name, c.id as course_id, c.name as course_name
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FROM student s
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JOIN enrollment e ON s.id = e.student_id
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JOIN course c ON e.course_id = c.id
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WHERE c.id = #{courseId}
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</select>
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<!-- 定义Enrollment结果映射 -->
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<resultMap id="EnrollmentResult" type="Enrollment">
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<id column="student_id" property="studentId" />
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<result column="student_name" property="studentName" />
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<id column="course_id" property="courseId" />
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<result column="course_name" property="courseName" />
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</resultMap>
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</mapper>
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<!DOCTYPE html>
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<html lang="en" xmlns:th="http://www.thymeleaf.org">
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<body>
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<meta charset="UTF-8">
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<h1>教务系统</h1>
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<h2>课程选课情况</h2>
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<a th:href="@{/courses}">返回课程列表</a>
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<table border="1">
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<tr>
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<td>学生ID</td>
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<td>学生姓名</td>
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<td>课程ID</td>
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<td>课程名</td>
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</tr>
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<tr th:each="enrollment : ${enrollments}">
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<td th:text="${enrollment.studentId}"></td>
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<td th:text="${enrollment.studentName}"></td>
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<td th:text="${enrollment.courseId}"></td>
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<td th:text="${enrollment.courseName}"></td>
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</tr>
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</table>
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</body>
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</html>
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