前言：
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课程模块包含了多条件查询、 图片上传、 新建&修改课程、课程状态管理、课程内容展示、回显章节对应的课程信息、新建&修改章节信息、修改章节状态、 新建&修改课时信息等接口的编写。
课程管理
实现以下功能：
多条件查询图片上传新建课程信息回显课程信息修改课程信息课程状态管理课程内容展示回显章节对应的课程信息新建&修改章节信息修改章节状态新建课时信息课程模块表设计创建数据库及表
数据库
ssm_lagou_edu
表
course 课程表course_lesson 课时表course_media 课程媒体表course_section 章节表menupromotion_adpromotion_spaceresourceresource_categoryrole_menu_relationrole_resource_relationrolesteacheruseruser_phone_verificationuser_role_relationuser_weixin表关系介绍ER 图
一个课程表对多个章节表
一个章节表对多个课时表
一个课时表对一个课程媒体表
数据实体描述
课程表
CREATE TABLE `course` ( `id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT COMMENT 'id', `course_name` VARCHAR(255) DEFAULT NULL COMMENT '课程名', `brief` VARCHAR(255) DEFAULT '' COMMENT '课程一句话简介', `price` DOUBLE(10,2) DEFAULT NULL COMMENT '原价', `price_tag` VARCHAR(255) DEFAULT '' COMMENT '原价标签', `discounts` DOUBLE(10,2) DEFAULT NULL COMMENT '优惠价', `discounts_tag` VARCHAR(255) DEFAULT NULL COMMENT '优惠标签', `course_description_mark_down` LONGTEXT COMMENT '描述markdown', `course_description` LONGTEXT COMMENT '课程描述', `course_img_url` VARCHAR(255) DEFAULT NULL COMMENT '课程分享图片url', `is_new` TINYINT(1) DEFAULT NULL COMMENT '是否新品', `is_new_des` VARCHAR(255) DEFAULT NULL COMMENT '广告语', `last_operator_id` INT(11) DEFAULT NULL COMMENT '最后操作者', `auto_online_time` DATETIME DEFAULT NULL COMMENT '自动上架时间', `create_time` DATETIME NOT NULL COMMENT '记录创建时间', `update_time` DATETIME NOT NULL COMMENT '更新时间', `is_del` TINYINT(1) DEFAULT '0' COMMENT '是否删除', `total_duration` INT(11) DEFAULT NULL COMMENT '总时长(分钟)', `course_list_img` VARCHAR(255) DEFAULT NULL COMMENT '课程列表展示图片', `status` INT(2) DEFAULT '0' COMMENT '课程状态，0-草稿，1-上架', `sort_num` INT(11) DEFAULT NULL COMMENT '课程排序，用于后台保存草稿时用到', `preview_first_field` VARCHAR(255) DEFAULT NULL COMMENT '课程预览第一个字段', `preview_second_field` VARCHAR(255) DEFAULT NULL COMMENT '课程预览第二个字段', `sales` INT(11) DEFAULT '0' COMMENT '销量', PRIMARY KEY (`id`) USING BTREE) ENGINE=INNODB AUTO_INCREMENT=31 DEFAULT CHARSET=utf8;
章节表
CREATE TABLE `course_section` ( `id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT COMMENT 'id', `course_id` INT(11) DEFAULT NULL COMMENT '课程id', `section_name` VARCHAR(255) NOT NULL DEFAULT '' COMMENT '章节名', `description` VARCHAR(255) NOT NULL DEFAULT '' COMMENT '章节描述', `create_time` DATETIME NOT NULL COMMENT '记录创建时间', `update_time` DATETIME NOT NULL COMMENT '更新时间', `is_de` TINYINT(1) DEFAULT '0' COMMENT '是否删除', `order_num` INT(11) DEFAULT NULL COMMENT '排序字段', `status` INT(1) NOT NULL DEFAULT '0' COMMENT '状态，0:隐藏；1：待更新；2：已发布', PRIMARY KEY (`id`) USING BTREE, KEY `course_id_index` (`course_id`) USING BTREE, KEY `idx_course_id` (`course_id`) USING BTREE) ENGINE=INNODB AUTO_INCREMENT=22 DEFAULT CHARSET=utf8;
课时表
CREATE TABLE `course_lesson` ( `id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT COMMENT 'id', `course_id` INT(11) NOT NULL COMMENT '课程id', `section_id` INT(11) NOT NULL DEFAULT '0' COMMENT '章节id', `theme` VARCHAR(255) NOT NULL COMMENT '课时主题', `duration` INT(11) NOT NULL DEFAULT '0' COMMENT '课时时长(分钟)', `is_free` TINYINT(1) NOT NULL DEFAULT '0' COMMENT '是否免费', `create_time` DATETIME NOT NULL COMMENT '记录创建时间', `update_time` DATETIME NOT NULL COMMENT '更新时间', `is_del` TINYINT(1) DEFAULT '0' COMMENT '是否删除', `order_num` INT(11) DEFAULT NULL COMMENT '排序字段', `status` INT(2) DEFAULT '0' COMMENT '课时状态,0-隐藏，1-未发布，2-已发布', PRIMARY KEY (`id`) USING BTREE, KEY `course_id_index` (`course_id`,`section_id`) USING BTREE, KEY `idx_sectionId_orderNum` (`section_id`,`order_num`) USING BTREE) ENGINE=INNODB AUTO_INCREMENT=26 DEFAULT CHARSET=utf8 COMMENT='课程节内容';
课程媒体
CREATE TABLE `course_media` ( `id` INT(11) NOT NULL AUTO_INCREMENT COMMENT '课程媒体主键ID', `course_id` INT(11) DEFAULT NULL COMMENT '课程Id', `section_id` INT(11) DEFAULT NULL COMMENT '章ID', `lesson_id` INT(11) DEFAULT NULL COMMENT '课时ID', `cover_image_url` VARCHAR(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '封面图URL', `duration` VARCHAR(50) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '时长（06:02）', `file_edk` VARCHAR(500) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '媒体资源文件对应的EDK', `file_size` DOUBLE(10,2) DEFAULT NULL COMMENT '文件大小MB', `file_name` VARCHAR(100) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '文件名称', `file_dk` VARCHAR(100) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '媒体资源文件对应的DK', `create_time` DATETIME NOT NULL COMMENT '创建时间', `update_time` DATETIME NOT NULL COMMENT '更新时间', `is_del` TINYINT(1) DEFAULT '0' COMMENT '是否删除，0未删除，1删除', `duration_num` INT(11) DEFAULT NULL COMMENT '时长，秒数（主要用于音频在H5控件中使用）', `file_id` VARCHAR(50) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '媒体资源文件ID', PRIMARY KEY (`id`) USING BTREE, UNIQUE KEY `uniq_lessonid_channel_mediatype_idx` (`lesson_id`) USING BTREE) ENGINE=INNODB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
课程模块接口实现
多条件课程列表查询需求分析
根据课程名称及课程状态进行多条件查询
查看接口文档，进行编码实体类 Course
public class Course { // 主键 private int id; // 课程名称 private String courseName; // 课程一句话简介 private String brief; // 原价 private double price; // 原价标签 private String priceTag; // 优惠价 private double discounts; // 优惠价标签 private String discountsTag; // 课程内容 markdown private String courseDescriptionMarkDown; // 课程描述 private String courseDescription; // 课程分享图片 url private String courseImgUrl; // 是否新品 private int isNew; // 广告语 private String isNewDes; // 最后操作者 private int lastOperatorId; // 自动上架时间 private Date autoOnlineTime; // 创建时间 private Date createTime; // 更新时间 private Date updateTime; // 是否删除 private int isDel; // 总时长 private int totalDuration; // 课程列表展示图片 private String courseListImg; // 课程状态，0 - 草稿，1 - 上架 private int status; // 课程排序 private int sortNum; // 课程预览第一个字段 private String previewFirstField; // 课程预览第二个字段 private String previewSecondField; // 销量 private int sales; // getter, setter, toString ...}ResponseResult用于表现层返回响应信息
public class ResponseResult { private Boolean success; private Integer state; private String message; private Object content; // getter, setter, toString ...}实体类 CourseVoView Object 表现层对象，主要用于表现层来接收参数的
public class CourseVO { // 主键 private Integer id; // 课程名称 private String courseName; // 课程一句话简介 private String brief; // 原价 private double price; // 原价标签 private String priceTag; // 优惠价 private double discounts; // 优惠价标签 private String discountsTag; // 课程内容 markdown private String courseDescriptionMarkDown; // 课程描述 private String courseDescription; // 课程分享图片 url private String courseImgUrl; // 是否新品 private int isNew; // 广告语 private String isNewDes; // 最后操作者 private int lastOperatorId; // 是否删除 private int isDel; // 总时长 private int totalDuration; // 课程列表展示图片 private String courseListImg; // 课程状态，0 - 草稿，1 - 上架 private int status; // 课程排序 private int sortNum; // 课程预览第一个字段 private String previewFirstField; // 课程预览第二个字段 private String previewSecondField; // 销量 private int sales; // 讲师姓名 private String teacherName; // 讲师职位 private String position; // 讲师描述 private String description; // getter, setter, toString ...}Dao层 CourseMapperpublic interface CourseMapper { /** * 多条件课程列表查询 */ List<Course> findCourseByCondition(CourseVO courseVO);}<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" ";><mapper namespace="com.renda.dao.CourseMapper"> <!-- 注意：status 在 mysql 是一个关键字，所以要加上反单引号来防止出现误判情况 --> <select id="findCourseByCondition" parameterType="courseVo" resultType="course"> select * from course <where> <if test="courseName != null and courseName != ''"> and course_name like concat('%', #{courseName}, '%') </if> <if test="`status` != null and `status` != ''"> and `status` = #{status} </if> <if test="true"> and is_del != 1 </if> </where> </select></mapper>Service 层 CourseServicepublic interface CourseService { List<Course> findCourseByCondition(CourseVO courseVO);}@Servicepublic class CourseServiceImpl implements CourseService { @Autowired private CourseMapper courseMapper; @Override public List<Course> findCourseByCondition(CourseVO courseVO) { return courseMapper.findCourseByCondition(courseVO); }}Web层 CourseController@RestController@RequestMapping("/course")public class CourseController { @Autowired private CourseService courseService; /** * 多条件课程列表查询 */ @RequestMapping("/findCourseByCondition") public ResponseResult findCourseByCondition(@RequestBody CourseVO courseVO) { // 调用 service List<Course> courseList = courseService.findCourseByCondition(courseVO); // 返回响应参数的 JSON 字符串 return new ResponseResult(true, 200, "响应成功", courseList); }}Postman 测试接口课程图片上传需求分析
在新增课程页面需要进行图片上传，并回显图片信息
查看接口文档，进行编码springmvc.xml
<!-- 配置文件解析器 --><!-- 此处 id 为固定写法，不能随便取名 --><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="1048576"/></bean>
Web 层 CourseController
@RequestMapping("/courseUpload")public ResponseResult fileUpload(@RequestParam("file") MultipartFile file, HttpServletRequest request) throws IOException { // 1.判断接收到的上传文件是否为空 if (file.isEmpty()) { throw new RuntimeException(); } // 2.获取项目部署路径 // D:\apache-tomcat-8.5.55\webapps\ssm-web\ String realPath = request.getServletContext().getRealPath("/"); // D:\apache-tomcat-8.5.56\webapps\ String substring = realPath.substring(0, realPath.indexOf("ssm_web")); // 3.生成新文件名 String originalFilename = file.getOriginalFilename(); String newFileName = "test"; if (originalFilename != null) { newFileName = System.currentTimeMillis() + originalFilename.substring(originalFilename.lastIndexOf(".")); } // 4.文件上传 String uploadPath = substring + "upload\\"; File filePath = new File(uploadPath, newFileName); // 如果目录不存在就创建目录 if (!filePath.getParentFile().exists()) { if (filePath.getParentFile().mkdirs()) { System.out.println("目录已经被创建：" + filePath); } else { System.out.println("创建目录失败"); } } // 图片进行上传 file.transferTo(filePath); // 5. 将文件名和文件路径返回，进行响应 HashMap<Object, Object> map = new HashMap<>(); map.put("fileName", newFileName); map.put("filePath", "; + newFileName); // 返回响应参数 return new ResponseResult(true, 200, "图片上传成功", map);}Postman 测试接口首先确保配置的 Tomcat 服务器的 Artifact 为 ssm-web:war，设置好图片 Tomcat 服务器保存图片的路径为 %MAVEN_HOME%\webapps\upload。
然后 Postman 测试时，选择 Body 的 form-data，并选择 key 为 file 属性。
新建课程信息需求分析
填写好新增课程信息以及关联的讲师信息后，点击保存，将表单信息保存到数据库中
查看接口文档，进行编码Dao 层 CourseMapper
void saveCourse(Course course);void saveTeacher(Teacher teacher);
CourseMapper.xml
<!-- 新增课程信息 使用 selectKey 获取添加成功记录返回的 ID 值赋值给 Course 实体中 ID 属性 --><insert id="saveCourse" parameterType="course"> <selectKey resultType="int" order="AFTER" keyProperty="id"> select LAST_INSERT_ID() </selectKey> INSERT INTO course( course_name, brief, preview_first_field, preview_second_field, course_img_url, course_list_img, sort_num, price, discounts, sales, discounts_tag, course_description_mark_down, create_time, update_time ) VALUES ( #{courseName},#{brief},#{previewFirstField},#{previewSecondField}, #{courseImgUrl},#{courseListImg},#{sortNum},#{price},#{discounts}, #{sales},#{discountsTag},#{courseDescriptionMarkDown},#{createTime}, #{updateTime} )</insert><!-- 新增讲师信息 --><insert id="saveTeacher" parameterType="teacher"> INSERT INTO teacher( course_id, teacher_name, `position`, description, create_time, update_time ) VALUES (#{courseId},#{teacherName},#{position},#{description},#{createTime},#{updateTime});</insert>Service 层 CourseServicevoid saveCourseOrTeacher(CourseVO courseVO) throws InvocationTargetException, IllegalAccessException;@Overridepublic void saveCourseOrTeacher(CourseVO courseVO) throws InvocationTargetException, IllegalAccessException { // 1.封装课程信息 Course course = new Course(); BeanUtils.copyProperties(course, courseVO); // 补全课程信息 Date date = new Date(); course.setCreateTime(date); course.setUpdateTime(date); // 保存课程 courseMapper.saveCourse(course); // 获取新插入数据的 id 值 int courseId = course.getId(); // 2.封装讲师信息 Teacher teacher = new Teacher(); BeanUtils.copyProperties(teacher, courseVO); // 补全讲师信息 teacher.setCreateTime(date); teacher.setUpdateTime(date); teacher.setIsDel(0); teacher.setCourseId(courseId); // 保存讲师信息 courseMapper.saveTeacher(teacher);}Web 层 CourseController@RequestMapping("/saveOrUpdateCourse")public ResponseResult saveOrUpdateCourse(@RequestBody CourseVO courseVO) throws InvocationTargetException, IllegalAccessException { courseService.saveCourseOrTeacher(courseVO); return new ResponseResult(true, 200, "响应成功", null);}Postman 测试接口回显课程信息需求分析
点击编辑按钮，回显课程信息以及其关联的讲师信息
查看接口文档，进行编码Dao 层 CourseMapper
CourseVO findCourseById(Integer id);
CourseMapper.xml
<select id="findCourseById" parameterType="int" resultType="courseVO"> SELECT c.*, t.`teacher_name` `teacher_name`, t.`position` `position`, t.`description` `description` FROM course c LEFT JOIN teacher t ON c.`id` = t.`course_id` WHERE c.`id` = #{id}</select>Service 层：CourseServiceCourseVO findCourseById(Integer id);@Overridepublic CourseVO findCourseById(Integer id) { return courseMapper.findCourseById(id);}Web 层 CourseController@RequestMapping("/findCourseById")public ResponseResult findCourseById(Integer id){ CourseVO courseVO = courseService.findCourseById(id); return new ResponseResult(true, 200, "根据ID查询课程信息成功", courseVO);}Postman 测试接口修改课程信息需求分析
点击保存按钮，将修改后的课程信息保存到数据库中
查看接口文档，进行编码Dao 层 CourseMapper
void updateTeacher(Teacher teacher);
CourseMapper.xml
<!-- 更新课程信息 --><update id="updateCourse" parameterType="course"> UPDATE course <trim prefix="SET" suffixOverrides=","> <if test="courseName != null and courseName != ''"> course_name = #{courseName}, </if> <if test="brief != null and brief != ''"> brief = #{brief}, </if> <if test="previewFirstField != null and previewFirstField != ''"> preview_first_field=#{previewFirstField}, </if> <if test="previewSecondField != null and previewSecondField != ''"> preview_second_field=#{previewSecondField}, </if> <if test="courseImgUrl != null and courseImgUrl != ''"> course_img_url=#{courseImgUrl}, </if> <if test="courseListImg != null and courseListImg != ''"> course_list_img=#{courseListImg}, </if> <if test="sortNum != null and sortNum != ''"> sort_num=#{sortNum}, </if> <if test="price != null and price != ''"> price=#{price}, </if> <if test="discounts != null and discounts != ''"> discounts=#{discounts}, </if> <if test="sales != null and sales != '' or sales==0"> sales=#{sales}, </if> <if test="discountsTag != null and discountsTag != ''"> discounts_tag=#{discountsTag}, </if> <if test="courseDescriptionMarkDown != null and courseDescriptionMarkDown != ''"> course_description_mark_down=#{courseDescriptionMarkDown}, </if> <if test="updateTime != null"> update_time=#{updateTime}, </if> </trim></update><!-- 更新讲师信息 --><update id="updateTeacher" parameterType="teacher"> UPDATE teacher <trim prefix="SET" suffixOverrides=","> <if test="teacherName != null and teacherName != ''"> teacher_name = #{teacherName}, </if> <if test="position != null and position != ''"> position = #{position}, </if> <if test="description != null and description != ''"> description = #{description}, </if> <if test="updateTime != null"> update_time=#{updateTime} </if> </trim> <where> <if test="courseId != null and courseId != ''">course_id = #{courseId}</if> </where></update>Service 层 CourseServicevoid updateCourseOrTeacher(CourseVO courseVO) throws InvocationTargetException, IllegalAccessException;@Overridepublic void updateCourseOrTeacher(CourseVO courseVO) throws InvocationTargetException, IllegalAccessException { // 封装课程信息 Course course = new Course(); BeanUtils.copyProperties(course, courseVO); // 补全信息 Date date = new Date(); course.setUpdateTime(date); // 更新课程信息 courseMapper.updateCourse(course); // 封装讲师信息 Teacher teacher = new Teacher(); BeanUtils.copyProperties(teacher, courseVO); // 补全信息 teacher.setCourseId(course.getId()); teacher.setUpdateTime(date); // 更新讲师信息 courseMapper.updateTeacher(teacher);}Web 层 CourseController@RequestMapping("/saveOrUpdateCourse")public ResponseResult saveOrUpdateCourse(@RequestBody CourseVO courseVO) throws InvocationTargetException, IllegalAccessException { if (courseVO.getId() == null) { // 新增操作 courseService.saveCourseOrTeacher(courseVO); return new ResponseResult(true, 200, "新增成功", null); } else { // 修改操作 courseService.updateCourseOrTeacher(courseVO); return new ResponseResult(true, 200, "修改成功", null); }}Postman 测试接口课程状态管理需求分析
在课程列表展示页面中，可以通过点击上架 / 下架按钮，修改课程状态
查看接口文档，进行编码Dao 层 CourseMapper
void updateCourseStatus(Course course);
CourseMapper.xml
<update id="updateCourseStatus" parameterType="course"> update `course` set `status` = #{status}, `update_time` = #{updateTime} where `id` = #{id}</update>Service 层 CourseServicevoid updateCourseStatus(int courseId, int status);@Overridepublic void updateCourseStatus(int courseId, int status) { // 封装数据 Course course = new Course(); course.setId(courseId); course.setStatus(status); course.setUpdateTime(new Date()); // 调用 mapper courseMapper.updateCourseStatus(course);}Web 层 CourseController@RequestMapping("/updateCourseStatus")public ResponseResult updateCourseStatus(Integer id, Integer status) { // 调用 service，传递参数，完成课程状态的变更 courseService.updateCourseStatus(id, status); // 响应数据 HashMap<Object, Object> map = new HashMap<>(); map.put("status", status); return new ResponseResult(true, 200, "课程状态变更成功", map);}Postman 测试接口课程内容展示需求分析
需求：点击内容管理，展示课程对应的课程内容（课程内容包含了章节和课时）
查看接口文档，进行编码
CourseSection 章节
public class CourseSection { // id private Integer id; // 课程 id private int courseId; // 章节名 private String sectionName; // 章节描述 private String description; // 创建时间 private Date createTime; // 更新时间 private Date updateTime; // 是否删除 private int isDe; // 排序 private int orderNum; // 状态 private int status; // 课时集合 private List<CourseLesson> lessonList; // getter, setter ...}CourseLesson 课时
public class CourseLesson { // 主键 private Integer id; // 课程 id private int courseId; // 章节 id private int sectionId; // 课时主题 private String theme; // 课时时长 private int duration; // 是否免费 private int isFree; // 创建时间 private Date createTime; // 修改时间 private Date updateTime; // 是否删除 private int isDel; // 排序 private int orderNum; // 状态 private int status; // getter, setter ...}Dao 层 CourseContentMapperpublic interface CourseContentMapper { List<CourseSection> findSectionAndLessonByCourseId(Integer courseId);}<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" ";><mapper namespace="com.renda.dao.CourseContentMapper"> <resultMap id="SectionAndLessonResultMap" type="courseSection"> <id property="id" column="id"/> <result property="courseId" column="course_id"/> <result property="sectionName" column="section_name"/> <result property="description" column="description"/> <result property="createTime" column="create_time"/> <result property="updateTime" column="update_time"/> <result property="isDe" column="is_de"/> <result property="orderNum" column="order_num"/> <collection property="lessonList" ofType="courseLesson"> <id property="id" column="lesson_id"/> <result property="courseId" column="course_id"/> <result property="sectionId" column="section_id"/> <result property="theme" column="theme"/> <result property="duration" column="duration"/> <result property="isFree" column="is_free"/> <result property="orderNum" column="order_num"/> <result property="status" column="status"/> </collection> </resultMap> <!-- 根据课程 ID 查询课程内容（章节 - 课时） --> <select id="findSectionAndLessonByCourseId" parameterType="int" resultMap="SectionAndLessonResultMap"> SELECT cs.*, cl.id lesson_id, cl.course_id, cl.section_id, cl.theme, cl.duration, cl.create_time, cl.update_time, cl.is_del, cl.order_num, cl.`status` FROM course_section cs LEFT JOIN course_lesson cl ON cl.section_id = cs.id WHERE cs.course_id = #{id} ORDER BY cs.order_num; </select></mapper>Service 层 CourseContentServicepublic interface CourseContentService { List<CourseSection> findSectionAndLessonByCourseId(Integer courseId);}@Servicepublic class CourseContentServiceImpl implements CourseContentService { @Autowired private CourseContentMapper courseContentMapper; @Override public List<CourseSection> findSectionAndLessonByCourseId(Integer courseId) { return courseContentMapper.findSectionAndLessonByCourseId(courseId); }}Web 层 CourseContentController@RestController@RequestMapping("/courseContent")public class CourseContentController { @Autowired private CourseContentService courseContentService; @RequestMapping("/findSectionAndLesson") public ResponseResult findSectionAndLessonByCourseId(Integer courseId) { List<CourseSection> list = courseContentService.findSectionAndLessonByCourseId(courseId); return new ResponseResult(true, 200, "章节及课时内容查询成功", list); }}Postman 测试接口回显章节对应的课程信息需求分析
在课程内容界面回显课程信息
查看接口文档，进行编码Dao 层 CourseContentMapper
Course findCourseByCourseId(int courseId);<select id="findCourseByCourseId" parameterType="int" resultType="course"> SELECT id, course_name FROM course WHERE id = #{courseId}</select>Service 层 CourseContentServiceCourse findCourseByCourseId(int courseId);@Overridepublic Course findCourseByCourseId(int courseId) { return courseContentMapper.findCourseByCourseId(courseId);}Web 层 CourseContentController@RequestMapping("/findCourseByCourseId")public ResponseResult findCourseByCourseId(Integer courseId){ Course course = courseContentService.findCourseByCourseId(courseId); return new ResponseResult(true, 200, "查询课程信息成功", course);}Postman 测试接口新建章节信息需求分析
在课程内容展示页面中，可以通过点击添加阶段按钮，添加章节信息
查看接口文档，进行编码Dao 层 CourseContentMapper
void saveSection(CourseSection courseSection);<insert id="saveSection" parameterType="CourseSection"> INSERT INTO course_section ( course_id, section_name, description, order_num, `status`, create_time, update_time ) VALUES (#{courseId},#{sectionName},#{description},#{orderNum}, #{status},#{createTime},#{updateTime});</insert>Service 层 CourseContentServicevoid saveSection(CourseSection courseSection);@Overridepublic void saveSection(CourseSection courseSection) { // 补全信息 Date date = new Date(); courseSection.setCreateTime(date); courseSection.setUpdateTime(date); // 调用 dao 方法 courseContentMapper.saveSection(courseSection);}Web 层 CourseContentController@RequestMapping("/saveOrUpdateSection")public ResponseResult saveOrUpdateSection(@RequestBody CourseSection courseSection) { courseContentService.saveSection(courseSection); return new ResponseResult(true, 200, "新增章节成功", null);}Postman 测试接口修改章节信息需求分析
点击确定按钮，将修改后的章节信息保存到数据库中
查看接口文档，进行编码Dao 层 CourseContentMapper
void updateSection(CourseSection courseSection);<update id="updateSection" parameterType="courseSection"> UPDATE course_section <trim prefix="SET" suffixOverrides=","> <if test="sectionName != null and sectionName != ''"> section_name = #{sectionName}, </if> <if test="description != null and description != ''"> description = #{description}, </if> <if test="orderNum != null and orderNum != '' or orderNum == 0"> order_num = #{orderNum}, </if> <if test="updateTime != null"> update_time = #{updateTime}, </if> </trim> <where> <if test="id != null and id != ''"> id = #{id} </if> </where></update>Service 层 CourseContentServicevoid updateSection(CourseSection courseSection);@Overridepublic void updateSection(CourseSection courseSection) { // 补全信息 courseSection.setUpdateTime(new Date()); // 调用 dao 方法 courseContentMapper.updateSection(courseSection);}Web 层 CourseContentController@RequestMapping("/saveOrUpdateSection")public ResponseResult saveOrUpdateSection(@RequestBody CourseSection courseSection) { // 判断是否携带了章节 ID if (courseSection.getId() == null) { // 新增 courseContentService.saveSection(courseSection); return new ResponseResult(true, 200, "新增章节成功", null); } else { // 更新 courseContentService.updateSection(courseSection); return new ResponseResult(true, 200, "更新章节成功", null); }}Postman 测试接口修改章节状态需求分析
点击修改章节状态按钮，将当前章节信息的状态进行修改
查看接口文档，进行编码Dao 层 CourseContentMapper
void updateSectionStatus(CourseSection courseSection);
CourseContentMapper.xml
<update id="updateSectionStatus" parameterType="courseSection"> UPDATE course_section SET `status` = #{status}, update_time = #{updateTime} WHERE id = #{id}</update>Service 层 CourseContentServicevoid updateSectionStatus(int id, int status);@Overridepublic void updateSectionStatus(int id, int status) { // 封装数据 CourseSection courseSection = new CourseSection(); courseSection.setStatus(status); courseSection.setUpdateTime(new Date()); courseSection.setId(id); // 调用 mapper courseContentMapper.updateSectionStatus(courseSection);}Web 层 CourseContentController@RequestMapping("/updateSectionStatus")public ResponseResult updateSectionStatus(int id, int status) { courseContentService.updateSectionStatus(id, status); // 数据响应 HashMap<Object, Object> map = new HashMap<>(); map.put("status", status); return new ResponseResult(true, 200, "修改章节状态成功", map);}Postman 测试接口新建课时信息需求分析
点击添加阶段按钮，将弹出页面填写的章节信息保存到数据库中
查看接口文档，进行编码
Dao 层 CourseContentMapper
void saveLesson(CourseLesson courseLesson);
CourseContentMapper.xml
<insert id="saveLesson" parameterType="courseLesson"> INSERT INTO course_lesson ( course_id, section_id, theme, duration, is_free, order_num, `status`, create_time, update_time ) VALUES (#{courseId},#{sectionId},#{theme},#{duration},#{isFree},#{orderNum}, #{status},#{createTime},#{updateTime});</insert>Service 层 CourseContentServicevoid saveLesson(CourseLesson courseLesson);@Overridepublic void saveLesson(CourseLesson courseLesson) { // 补全信息 Date date = new Date(); courseLesson.setCreateTime(date); courseLesson.setUpdateTime(date); // 调用 dao 方法 courseContentMapper.saveLesson(courseLesson);}Web 层 CourseContentController@RequestMapping("/saveOrUpdateLesson")public ResponseResult saveOrUpdateLesson(@RequestBody CourseLesson courseLesson) { courseContentService.saveLesson(courseLesson); return new ResponseResult(true, 200, "新增课时成功", null);}Postman 测试接口修改课时信息需求分析
点击确定按钮，将修改后的课时信息保存到数据库中
查看接口文档，进行编码
Dao 层 CourseContentMapper
void updateLesson(CourseLesson courseLesson);
CourseContentMapper.xml
<update id="updateLesson" parameterType="courseLesson"> UPDATE course_lesson <trim prefix="SET" suffixOverrides=","> <if test="theme != null and theme != ''"> theme = #{theme}, </if> <if test="duration != null and duration != ''"> duration = #{duration}, </if> <if test="`isFree` != null and `isFree` != ''"> is_free = #{isFree}, </if> <if test="orderNum != null and orderNum != '' or orderNum == 0"> order_num = #{orderNum}, </if> <if test="updateTime != null"> update_time = #{updateTime}, </if> </trim> <where> <if test="id != null and id != ''"> id = #{id} </if> </where></update>Service 层 CourseContentServicevoid updateLesson(CourseLesson courseLesson);@Overridepublic void updateLesson(CourseLesson courseLesson) { // 补全信息 courseLesson.setUpdateTime(new Date()); // 调用 dao 方法 courseContentMapper.updateLesson(courseLesson);}Web 层 CourseContentController@RequestMapping("/saveOrUpdateLesson")public ResponseResult saveOrUpdateLesson(@RequestBody CourseLesson courseLesson) { // 判断是否携带了课时 ID if (courseLesson.getId() == null) { // 新增 courseContentService.saveLesson(courseLesson); return new ResponseResult(true, 200, "新增课时成功", null); } else { // 更新 courseContentService.updateLesson(courseLesson); return new ResponseResult(true, 200, "修改课时成功", null); }}Postman 测试接口想了解更多，欢迎关注我的微信公众号：Renda_Zhang
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