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feature/co
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package icu.sunway.ai_spring_example.Controllers;
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import com.baomidou.dynamic.datasource.annotation.DS;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.jdbc.core.JdbcTemplate;
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import org.springframework.web.bind.annotation.*;
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import icu.sunway.ai_spring_example.Common.ResponseEntity;
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import java.sql.Timestamp;
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import java.time.LocalDateTime;
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import java.time.format.DateTimeFormatter;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import org.springframework.web.bind.annotation.DeleteMapping;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.PathVariable;
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import org.springframework.web.bind.annotation.PostMapping;
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import org.springframework.web.bind.annotation.RequestBody;
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import org.springframework.web.bind.annotation.RequestParam;
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import org.springframework.web.bind.annotation.RestController;
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import icu.sunway.ai_spring_example.Common.ResponseEntity;
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/**
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* 课程控制器
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* 提供课程展示和报名相关的功能
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*/
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@RestController
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@DS("master") // 指定sys_user库
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public class Course {
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@Autowired
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private JdbcTemplate jdbcTemplate;
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/**
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* 获取课程列表
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*
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* @param params 查询参数，包含page、size、name、category、status等字段
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* @return 课程列表数据
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* 获取课程列表（仅名称模糊查询+分页）
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*/
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@GetMapping("/courses")
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public ResponseEntity<?> getCourseList(@RequestParam Map<String, Object> params) {
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// 从Map中获取查询参数
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try {
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Integer page = Integer.valueOf((String) params.getOrDefault("page", "1"));
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Integer size = Integer.valueOf((String) params.getOrDefault("size", "10"));
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String name = (String) params.get("name");
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String category = (String) params.get("category");
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Integer status = params.get("status") != null ? Integer.valueOf((String) params.get("status")) : null;
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// TODO: 实现查询逻辑
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// 1. 根据条件查询课程列表
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// 2. 处理分页
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// 构建SQL
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StringBuilder sql = new StringBuilder("SELECT id, course_name AS name, intro AS description, create_time FROM course WHERE 1=1");
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StringBuilder countSql = new StringBuilder("SELECT COUNT(*) FROM course WHERE 1=1");
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List<Object> sqlParams = new ArrayList<>();
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// 模拟返回课程列表
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List<Map<String, Object>> courseList = List.of(
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Map.of("id", 1, "name", "Java基础课程", "category", "编程", "teacher", "张老师", "price", 99.00, "students", 150,
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"status", 1, "description", "Java入门到精通课程"),
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Map.of("id", 2, "name", "Python数据分析", "category", "数据科学", "teacher", "李老师", "price", 199.00, "students",
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80, "status", 1, "description", "Python数据分析实战课程"));
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// 仅名称模糊查询
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if (name != null && !name.isEmpty()) {
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sql.append(" AND course_name LIKE ?");
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countSql.append(" AND course_name LIKE ?");
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sqlParams.add("%" + name + "%");
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}
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// 分页
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int offset = (page - 1) * size;
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sql.append(" LIMIT " + offset + ", " + size);
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// 执行查询
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List<Map<String, Object>> courseList = jdbcTemplate.queryForList(sql.toString(), sqlParams.toArray());
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Long total = jdbcTemplate.queryForObject(countSql.toString(), sqlParams.toArray(), Long.class);
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// 组装返回
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Map<String, Object> responseData = new HashMap<>();
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responseData.put("list", courseList);
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responseData.put("total", 2);
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responseData.put("total", total);
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responseData.put("page", page);
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responseData.put("size", size);
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return ResponseEntity.success("获取课程列表成功", responseData);
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} catch (Exception e) {
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e.printStackTrace();
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return ResponseEntity.error(500, "获取课程列表失败：" + e.getMessage());
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}
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}
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/**
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* 获取课程详情
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*
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* @param courseId 课程ID
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* @return 课程详细信息
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* 获取课程详情（仅关联章节核心字段）
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*/
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@GetMapping("/courses/{courseId}")
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public ResponseEntity<?> getCourseDetail(@PathVariable Long courseId) {
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// 参数验证
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if (courseId == null) {
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return ResponseEntity.error(400, "课程ID不能为空");
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try {
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if (courseId == null || courseId <= 0) {
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return ResponseEntity.error(400, "课程ID不能为空且必须为正整数");
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}
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// TODO: 实现查询逻辑
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// 1. 根据课程ID查询课程信息
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// 2. 查询课程章节、评价等关联信息
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// 查询课程基本信息
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String courseSql = "SELECT id, course_name AS name, intro AS description, create_time FROM course WHERE id = ?";
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List<Map<String, Object>> courseList = jdbcTemplate.queryForList(courseSql, courseId);
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if (courseList.isEmpty()) {
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return ResponseEntity.error(404, "课程不存在");
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}
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Map<String, Object> courseInfo = courseList.get(0);
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// 模拟返回课程详情
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Map<String, Object> courseInfo = Map.of(
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"id", courseId, "name", "Java基础课程", "category", "编程", "teacher", "张老师", "price", 99.00,
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"students", 150, "status", 1, "description", "Java入门到精通课程",
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"chapters", List.of(
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Map.of("id", 1, "name", "Java简介", "duration", "30分钟"),
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Map.of("id", 2, "name", "变量与数据类型", "duration", "45分钟")),
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"ratings", Map.of("avg", 4.8, "count", 50));
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// 查询章节
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String chapterSql = """
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SELECT c.id, c.course_id, c.vedio_url, c.create_time
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FROM chapter c
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LEFT JOIN course co ON c.course_id = co.id
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WHERE c.course_id = ?
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ORDER BY c.id ASC
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""";
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List<Map<String, Object>> chapters = jdbcTemplate.queryForList(chapterSql, courseId);
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courseInfo.put("chapters", chapters);
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return ResponseEntity.success("获取课程详情成功", courseInfo);
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} catch (Exception e) {
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e.printStackTrace();
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return ResponseEntity.error(500, "获取课程详情失败：" + e.getMessage());
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}
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}
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/**
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* 课程报名
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*
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* @param enrollMap 报名信息，包含courseId、userId等字段
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* @return 报名结果
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*/
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@PostMapping("/courses/enroll")
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public ResponseEntity<?> enrollCourse(@RequestBody Map<String, Object> enrollMap) {
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// 从Map中获取报名信息
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try {
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Long courseId = (Long) enrollMap.get("courseId");
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Long userId = (Long) enrollMap.get("userId");
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// 参数验证
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if (courseId == null) {
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return ResponseEntity.error(400, "课程ID不能为空");
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if (courseId == null || courseId <= 0) {
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return ResponseEntity.error(400, "课程ID不能为空且必须为正整数");
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}
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if (userId == null) {
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return ResponseEntity.error(400, "用户ID不能为空");
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if (userId == null || userId <= 0) {
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return ResponseEntity.error(400, "用户ID不能为空且必须为正整数");
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}
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// TODO: 实现报名逻辑
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// 1. 检查课程是否存在且可报名
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// 2. 检查用户是否已报名该课程
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// 3. 记录报名信息
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// 4. 更新课程报名人数
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// 检查课程是否存在
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String checkCourseSql = "SELECT id FROM course WHERE id = ?";
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if (jdbcTemplate.queryForList(checkCourseSql, courseId).isEmpty()) {
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return ResponseEntity.error(404, "课程不存在");
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}
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// 模拟报名成功
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// 检查重复报名
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String checkEnrollSql = "SELECT id FROM course_user WHERE user_id = ? AND course_id = ?";
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if (!jdbcTemplate.queryForList(checkEnrollSql, userId, courseId).isEmpty()) {
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return ResponseEntity.error(400, "已报名该课程，无需重复报名");
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}
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// 写入报名记录
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String insertSql = "INSERT INTO course_user (user_id, course_id, create_time) VALUES (?, ?, ?)";
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jdbcTemplate.update(insertSql, userId, courseId, new Timestamp(System.currentTimeMillis()));
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// 组装返回
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Map<String, Object> responseData = new HashMap<>();
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responseData.put("courseId", courseId);
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responseData.put("userId", userId);
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responseData.put("enrollTime", "2023-05-20 10:00:00");
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responseData.put("enrollTime", LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
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return ResponseEntity.success("课程报名成功", responseData);
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} catch (Exception e) {
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e.printStackTrace();
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return ResponseEntity.error(500, "课程报名失败：" + e.getMessage());
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}
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}
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/**
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* 获取用户报名的课程列表
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*
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* @param params 查询参数，包含userId、page、size等字段
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* @return 用户报名的课程列表
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*/
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@GetMapping("/user/courses")
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public ResponseEntity<?> getUserCourses(@RequestParam Map<String, Object> params) {
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// 从Map中获取查询参数
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try {
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Long userId = Long.valueOf((String) params.get("userId"));
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Integer page = Integer.valueOf((String) params.getOrDefault("page", "1"));
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Integer size = Integer.valueOf((String) params.getOrDefault("size", "10"));
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// 参数验证
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if (userId == null) {
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return ResponseEntity.error(400, "用户ID不能为空");
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if (userId == null || userId <= 0) {
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return ResponseEntity.error(400, "用户ID不能为空且必须为正整数");
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}
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// TODO: 实现查询逻辑
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// 1. 根据用户ID查询已报名课程
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// 2. 处理分页
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// 关联查询
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int offset = (page - 1) * size;
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String sql = """
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SELECT cu.id, cu.course_id AS courseId, co.course_name AS courseName, cu.create_time AS enrollTime
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FROM course_user cu
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LEFT JOIN course co ON cu.course_id = co.id
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WHERE cu.user_id = ?
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LIMIT """ + offset + ", " + size;
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// 模拟返回用户报名的课程列表
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List<Map<String, Object>> userCourseList = List.of(
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Map.of("id", 1, "courseId", 1, "courseName", "Java基础课程", "teacher", "张老师", "enrollTime",
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"2023-05-20 10:00:00", "status", "learning"),
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Map.of("id", 2, "courseId", 2, "courseName", "Python数据分析", "teacher", "李老师", "enrollTime",
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"2023-05-15 14:30:00", "status", "completed"));
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List<Map<String, Object>> userCourseList = jdbcTemplate.queryForList(sql, userId);
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// 仅保留必要字段，删除status补充
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userCourseList.forEach(item -> item.put("status", "learning")); // 可选：保留状态字段，仅做模拟
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// 查询总数
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String countSql = "SELECT COUNT(*) FROM course_user WHERE user_id = ?";
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Long total = jdbcTemplate.queryForObject(countSql, new Object[]{userId}, Long.class);
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// 组装返回
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Map<String, Object> responseData = new HashMap<>();
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responseData.put("list", userCourseList);
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responseData.put("total", 2);
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responseData.put("total", total);
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responseData.put("page", page);
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responseData.put("size", size);
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return ResponseEntity.success("获取用户课程列表成功", responseData);
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} catch (Exception e) {
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e.printStackTrace();
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return ResponseEntity.error(500, "获取用户课程列表失败：" + e.getMessage());
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}
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}
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/**
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* 取消课程报名
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*
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* @param courseId 课程ID
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* @param params 参数，包含userId字段
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* @return 取消报名结果
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*/
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@DeleteMapping("/courses/{courseId}/enroll")
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public ResponseEntity<?> cancelEnroll(@PathVariable Long courseId, @RequestParam Map<String, Object> params) {
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// 从Map中获取用户ID
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try {
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Long userId = Long.valueOf((String) params.get("userId"));
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// 参数验证
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if (courseId == null) {
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return ResponseEntity.error(400, "课程ID不能为空");
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if (courseId == null || courseId <= 0) {
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return ResponseEntity.error(400, "课程ID不能为空且必须为正整数");
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}
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if (userId == null) {
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return ResponseEntity.error(400, "用户ID不能为空");
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if (userId == null || userId <= 0) {
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return ResponseEntity.error(400, "用户ID不能为空且必须为正整数");
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}
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// TODO: 实现取消报名逻辑
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// 1. 检查报名记录是否存在
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// 2. 删除报名记录
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// 3. 更新课程报名人数
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// 检查报名记录
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String checkSql = "SELECT id FROM course_user WHERE user_id = ? AND course_id = ?";
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if (jdbcTemplate.queryForList(checkSql, userId, courseId).isEmpty()) {
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return ResponseEntity.error(404, "未报名该课程，无法取消");
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}
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// 模拟取消报名成功
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// 删除记录
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String deleteSql = "DELETE FROM course_user WHERE user_id = ? AND course_id = ?";
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jdbcTemplate.update(deleteSql, userId, courseId);
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// 组装返回
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Map<String, Object> responseData = new HashMap<>();
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responseData.put("courseId", courseId);
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responseData.put("userId", userId);
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return ResponseEntity.success("取消课程报名成功", responseData);
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} catch (Exception e) {
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e.printStackTrace();
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return ResponseEntity.error(500, "取消课程报名失败：" + e.getMessage());
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}
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}
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}
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Reference in New Issue
Block a user