谷粒学院——Day07【课程发布-添加课程信息】

Dear 丶 2023-09-27 12:34 74阅读 0赞

## 课程分类管理【添加分类前端】 ##

### 一、配置路由 ###

#### 1. 添加路由 ####

在 `src/router/index.js` 中添加路由：

{
        // 地址输入
        path: '/subject',
        component: Layout,
        // redirect: 重定向地址
        redirect: '/subject/list',
        name: '课程分类管理',
        // title：显示标签  icon：显示图标
        meta: { title: '课程分类管理', icon: 'example' },
        children: [
          {
            path: 'list',
            name: '课程分类列表',
            component: () => import('@/views/edu/subject/list'),
            meta: { title: '课程分类列表', icon: 'table' }
          },
          {
            path: 'save',
            name: '添加课程分类',
            component: () => import('@/views/edu/subject/save'),
            meta: { title: '添加课程分类', icon: 'tree' }
          }  
        ]
      }

#### 2. 添加vue组件 ####

![在这里插入图片描述][34b75cca0839425fadb37c28bf4d209a.png]

--------------------

### 二、表单组件save.vue ###

#### 1. js定义数据 ####

#### 2. template ####

<template>
          <div class="app-container">
        <el-form label-width="120px">
          <el-form-item label="信息描述">
            <el-tag type="info">excel模版说明</el-tag>
            <el-tag>
              <i class="el-icon-download" />
              <a :href="'/static/01.xlsx'">点击下载模版</a>
            </el-tag>
          </el-form-item>
          <el-form-item label="选择Excel">
            <el-upload
              ref="upload"
              :auto-upload="false"
              :on-success="fileUploadSuccess"
              :on-error="fileUploadError"
              :disabled="importBtnDisabled"
              :limit="1"
              :action="BASE_API + '/eduservice/subject/addSubject'"
              name="file"
              accept="application/vnd.ms-excel"
            >
              <el-button slot="trigger" size="small" type="primary"
                >选取文件</el-button
              >
              <el-button
                :loading="loading"
                style="margin-left: 10px"
                size="small"
                type="success"
                @click="submitUpload"
                >上传到服务器</el-button
              >
            </el-upload>
          </el-form-item>
        </el-form>
      </div>
    
    </template>

#### 3. js上传方法 ####

methods: {
    
            // 点击按钮上传文件到接口里面
            submitUpload() {
                this.importBtnDisabled = true
                this.loading = true
                this.$refs.upload.submit()
            },
    
            // 上传成功
            fileUploadSuccess(response) {
               
            },
    
            // 上传失败
            fileUploadError() { 
           
            }
        }

#### 4. 回调函数 ####

// 上传成功
            fileUploadSuccess(response) {
                // 提示信息
                this.loading = false
                this.$message({
                    type: 'success',
                    message: '添加课程分类成功'
                })
                // 跳转到课程分类列表
    
    
            },
    
            // 上传失败
            fileUploadError() { 
                this.loading = false
                this.$message({
                    type: 'error',
                    message: '添加课程 分类失败'
                })
            }

#### 5. 测试 ####

![在这里插入图片描述][50f1f40e65f64c2cb6f8701b2e49f88d.png]  
  
![在这里插入图片描述][30f1d9446eb444a9ac28d3ba60077dfd.png]  
  
![在这里插入图片描述][13cc096d754046adb62ba4c7f09618a9.png]

--------------------

## 课程分类管理【课程分类列表】 ##

### 一、后端实现 ###

#### 1. 创建实体类 ####

在 `entity` 包下创建 `Subject` 包用于封装树形数据结构。

*  一级分类

@Data
    public class OneSubject {
    
        private String id;
    
        private String title;
    
        //一个一级分类有多个二级分类
        private List<TwoSubject> children = new ArrayList<>();
    
    }

*  二级分类

//二级分类
    @Data
    public class TwoSubject {
    
        private String id;
    
        private String title;
    }

#### 2. controller层 ####

// 课程分类列表(树形)
        @ApiOperation(value = "嵌套数据列表")
        @GetMapping("getAllSubject")
        public R getAllSubject() {
    
            // list集合泛型是一级分类，一级分类中本身含有二级分类
            List<OneSubject> list = eduSubjectService.getAllOneTwoSubject();
            return R.ok().data("list", list);
        }

#### 3. service层 ####

在 `EduSubjectService` 接口中添加方法：

public interface EduSubjectService extends IService<EduSubject> {
    
        // 添加课程分类
        void addSubject(MultipartFile file, EduSubjectService eduSubjectService);
    
        // 课程分类列表(树形)
        List<OneSubject> getAllOneTwoSubject();
    }

在 `EduSubjectServiceImpl`实现类中添加方法：

// 课程分类列表(树形)
        @Override
        public List<OneSubject> getAllOneTwoSubject() {
    
            // 1. 查询所有的一级分类 parent_id = 0
            QueryWrapper<EduSubject> wrapperOne = new QueryWrapper<>();
            wrapperOne.eq("parent_id", 0);
            List<EduSubject> oneSubjectList = baseMapper.selectList(wrapperOne);
    
            // 2. 查询所有的二级分类 parent_id != 0
            QueryWrapper<EduSubject> wrapperTwo = new QueryWrapper<>();
            wrapperTwo.ne("parent_id", 0);
            List<EduSubject> twoSubjectList = baseMapper.selectList(wrapperTwo);
    
            // 创建list集合，用于封装最终数据
            List<OneSubject> finalSubjectList = new ArrayList<>();
    
            // 3. 封装一级分类
            // 查询出来所有的一级分类list集合遍历，得到每一个一级分类对象，获取每个一级分类对象值
            // 封装到要求的最终list集合里面 List<OneSubject> finalSubjectList
            for (int i = 0; i < oneSubjectList.size(); i ++ ) { // 遍历oneSubjectList集合
                // 得到oneSubjectList每个eduSubject对象
                EduSubject eduSubject = oneSubjectList.get(i);
    
                // 把eduSubject里面的值获取出来，放到oneSubject对象中去
                OneSubject oneSubject = new OneSubject();
    
    //            oneSubject.setId(eduSubject.getId());
    //            oneSubject.setTitle(eduSubject.getTitle());
    
                // 把eduSubject值复制到oneSubject中去【要求两个类的复制注入的属性名一致】
                BeanUtils.copyProperties(eduSubject, oneSubject);
    
                // 多个oneSubject放到finalSubject里面
                finalSubjectList.add(oneSubject);
    
                // 4. 封装二级分类
                // 在一级分类循环遍历查询所有的二级分类
                // 创建list集合封装每个一级分类的二级分类
                ArrayList<TwoSubject> twoFinalSubjectList = new ArrayList<>();
    
                // 遍历二级list集合
                for (int j = 0; j < twoSubjectList.size(); j++) {
                    // 获取每个二级分类
                    EduSubject tSubject = twoSubjectList.get(j);
                    // 判断二级分类parent_id 和一级分类的id是否一样
                    if (tSubject.getParentId().equals(oneSubject.getId())) {
                        // 把tSubject的值复制到TwoSubject，最终放到twoSubjectList里面
                        TwoSubject twoSubject = new TwoSubject();
                        BeanUtils.copyProperties(tSubject, twoSubject);
                        twoFinalSubjectList.add(twoSubject);
                    }
                }
    
                // 把一级下面所有二级分类放到oneSubject里面
                oneSubject.setChildren(twoFinalSubjectList);
            }
    
    
            return finalSubjectList;
        }

--------------------

### 二、前端实现 ###

#### 1. 参考 views/tree/index.vue ####

#### 2. 创建api ####

`api/edu/subject.js`

import request from '@/utils/request' // 引入已经封装好的axios 和 拦截器
    
    export default {
    
        // 课程分类列表
        getSubjectList() {
            return request({
                url: `/eduservice/subject/getAllSubject`,
                method: 'get'
              })
        }
    
    }

#### 3. list.vue ####

<template>
      <div class="app-container">
        <el-input v-model="filterText" placeholder="Filter keyword" style="margin-bottom:30px;" />
    
        <el-tree
          ref="tree2"
          :data="data2"
          :props="defaultProps"
          :filter-node-method="filterNode"
          class="filter-tree"
          default-expand-all
        />
    
      </div>
    </template>
    
    <script>
    import subject from '@/api/edu/subject.js'
    export default {
    
      data() {
        return {
          filterText: '',
          data2: [],  // 返回所有分类数据
          defaultProps: {
            children: 'children',
            label: 'title'
          }
        }
      },
    
      created() {
        this.getAllSubjectList()
      },
    
      watch: {
        filterText(val) {
          this.$refs.tree2.filter(val)
        }
      },
    
      methods: {
        getAllSubjectList(){
          subject.getSubjectList()
            .then(resp=>{
                this.data2 = resp.data.list
            })
        },
    
        filterNode(value, data) {
          if (!value) return true
          return data.title.indexOf(value) !== -1;
        }
      }
    }
    </script>

#### 4. 优化前端过滤功能 ####

filterNode(value, data) {
          if (!value) return true
          return data.title.toLowerCase().indexOf(value.toLowerCase()) !== -1
        }

#### 5. 测试 ####

![在这里插入图片描述][0306d51895274abcbb4f37c33f4c679a.png]

--------------------

## 课程管理【课程发布流程说明】 ##

![请添加图片描述][f4e4ea7e367a447f91ce38376a8d745a.png]  
  
![请添加图片描述][991f7dbcd8da4c249f507a7a0ca70232.png]  
  
![请添加图片描述][6d0f84bbe0df415e841501fb69762b14.png]  
  
![在这里插入图片描述][f5407a494f6a4a66b05f0685778a096e.png_pic_center]

--------------------

## 课程管理【课程相关表关系】 ##

![在这里插入图片描述][6781a3148692485d847777b8158f97fd.png_pic_center]

--------------------

## 课程管理【添加课程分析】 ##

### 一、设计数据库 ###

`edu_teacher、edu_subject` 数据库表在之前的功能中已经添加过了。

*  `edu_course_description课程简介表`
    
        CREATE TABLE `edu_course_description` (
          `id` char(19) NOT NULL COMMENT '课程ID',
          `description` text COMMENT '课程简介',
          `gmt_create` datetime NOT NULL COMMENT '创建时间',
          `gmt_modified` datetime NOT NULL COMMENT '更新时间',
          PRIMARY KEY (`id`)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='课程简介';
        
        #
        # Data for table "edu_course_description"
        #
        
        INSERT INTO `edu_course_description` VALUES ('1104870479077879809','<p>11</p>','2019-03-11 06:23:44','2019-03-11 06:23:44'),('1192252213659774977','<p>测试</p>','2019-11-07 09:27:33','2019-11-13 16:21:28'),('14','','2019-03-13 06:04:43','2019-03-13 06:05:33'),('15','','2019-03-13 06:03:33','2019-03-13 06:04:22'),('18','<p>本套Java视频完全针对零基础学员，课堂实录，自发布以来，好评如潮！Java视频中注重与学生互动，讲授幽默诙谐、细致入微，覆盖Java基础所有核心知识点，同类Java视频中也是代码量大、案例多、实战性强的。同时，本Java视频教程注重技术原理剖析，深入JDK源码，辅以代码实战贯穿始终，用实践驱动理论，并辅以必要的代码练习。</p>\n<p>------------------------------------</p>\n<p>视频特点：</p>\n<p>通过学习本Java视频教程，大家能够真正将Java基础知识学以致用、活学活用，构架Java编程思想，牢牢掌握\"源码级\"的Javase核心技术，并为后续JavaWeb等技术的学习奠定扎实基础。<br /><br />1.通俗易懂，细致入微：每个知识点高屋建瓴，深入浅出，简洁明了的说明问题<br />2.具实战性：全程真正代码实战，涵盖上百个企业应用案例及练习<br />3.深入：源码分析，更有 Java 反射、动态代理的实际应用等<br />4.登录尚硅谷官网，技术讲师免费在线答疑</p>','2019-03-06 18:06:36','2019-10-30 19:58:36');
 *  `edu_video课程小节表`
    
        CREATE TABLE `edu_video` (
          `id` char(19) NOT NULL COMMENT '视频ID',
          `course_id` char(19) NOT NULL COMMENT '课程ID',
          `chapter_id` char(19) NOT NULL COMMENT '章节ID',
          `title` varchar(50) NOT NULL COMMENT '节点名称',
          `video_source_id` varchar(100) DEFAULT NULL COMMENT '云端视频资源',
          `video_original_name` varchar(100) DEFAULT NULL COMMENT '原始文件名称',
          `sort` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '排序字段',
          `play_count` bigint(20) unsigned NOT NULL DEFAULT '0' COMMENT '播放次数',
          `is_free` tinyint(1) unsigned NOT NULL DEFAULT '0' COMMENT '是否可以试听：0收费 1免费',
          `duration` float NOT NULL DEFAULT '0' COMMENT '视频时长（秒）',
          `status` varchar(20) NOT NULL DEFAULT 'Empty' COMMENT 'Empty未上传 Transcoding转码中  Normal正常',
          `size` bigint(20) unsigned NOT NULL DEFAULT '0' COMMENT '视频源文件大小（字节）',
          `version` bigint(20) unsigned NOT NULL DEFAULT '1' COMMENT '乐观锁',
          `gmt_create` datetime NOT NULL COMMENT '创建时间',
          `gmt_modified` datetime NOT NULL COMMENT '更新时间',
          PRIMARY KEY (`id`),
          KEY `idx_course_id` (`course_id`),
          KEY `idx_chapter_id` (`chapter_id`)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 ROW_FORMAT=COMPACT COMMENT='课程视频';
        
        #
        # Data for table "edu_video"
        #
        
        INSERT INTO `edu_video` VALUES ('1182499307429339137','18','32','第一节','','',0,0,0,0,'',0,1,'2019-10-11 11:32:59','2019-10-11 11:57:38'),('1185312444399071234','14','1','12','','',0,0,0,0,'Empty',0,1,'2019-10-19 05:51:23','2019-10-19 05:51:33'),('1189434737808990210','18','44','测试','','',1,0,0,0,'Empty',0,1,'2019-10-30 14:51:55','2019-10-30 14:51:55'),('1189471423678939138','18','1181729226915577857','test','2b887dc9584d4dc68908780ec57cd3b9','视频',1,0,0,0,'Empty',0,1,'2019-10-30 17:17:41','2019-10-30 17:17:41'),('1189476403626409986','18','1181729226915577857','22','5155c73dc112475cbbddccf4723f7cef','视频.mp4',0,0,0,0,'Empty',0,1,'2019-10-30 17:37:29','2019-10-30 17:37:29'),('1192252824606289921','1192252213659774977','1192252428399751169','第一课时','756cf06db9cb4f30be85a9758b19c645','eae2b847ef8503b81f5d5593d769dde2.mp4',0,0,0,0,'Empty',0,1,'2019-11-07 09:29:59','2019-11-07 09:29:59'),('1192628092797730818','1192252213659774977','1192252428399751169','第二课时','2a02d726622f4c7089d44cb993c531e1','eae2b847ef8503b81f5d5593d769dde2.mp4',0,0,1,0,'Empty',0,1,'2019-11-08 10:21:10','2019-11-08 10:21:22'),('1192632495013380097','1192252213659774977','1192252428399751169','第三课时','4e560c892fdf4fa2b42e0671aa42fa9d','eae2b847ef8503b81f5d5593d769dde2.mp4',0,0,1,0,'Empty',0,1,'2019-11-08 10:38:40','2019-11-08 10:38:40'),('1194117638832111617','1192252213659774977','1192252428399751169','第四课时','4e560c892fdf4fa2b42e0671aa42fa9d','eae2b847ef8503b81f5d5593d769dde2.mp4',0,0,0,0,'Empty',0,1,'2019-11-12 13:00:05','2019-11-12 13:00:05'),('1196263770832023554','1192252213659774977','1192252428399751169','第五课时','27d21158b0834cb5a8d50710937de330','eae2b847ef8503b81f5d5593d769dde2.mp4',5,0,0,0,'Empty',0,1,'2019-11-18 11:08:03','2019-11-18 11:08:03'),('17','18','15','第一节：Java简介','196116a6fee742e1ba9f6c18f65bd8c1','1',1,1000,1,100,'Draft',0,1,'2019-01-01 13:08:57','2019-10-11 11:26:39'),('18','18','15','第二节：表达式和赋值语句','2d99b08ca0214909899910c9ba042d47','7 - How Do I Find Time for My ',2,999,1,100,'Draft',0,1,'2019-01-01 13:09:02','2019-03-08 03:30:27'),('19','18','15','第三节：String类','51120d59ddfd424cb5ab08b44fc8b23a','eae2b847ef8503b81f5d5593d769dde2.mp4',3,888,0,100,'Draft',0,1,'2019-01-01 13:09:05','2019-11-12 12:50:45'),('20','18','15','第四节：程序风格','2a38988892d84df598752226c50f3fa3','00-day10总结.avi',4,666,0,100,'Draft',0,1,'2019-01-01 13:09:05','2019-10-11 09:20:09');
 *  `edu_course课程基本信息`
    
        CREATE TABLE `edu_course` (
          `id` char(19) NOT NULL COMMENT '课程ID',
          `teacher_id` char(19) NOT NULL COMMENT '课程讲师ID',
          `subject_id` char(19) NOT NULL COMMENT '课程专业ID',
          `subject_parent_id` char(19) NOT NULL COMMENT '课程专业父级ID',
          `title` varchar(50) NOT NULL COMMENT '课程标题',
          `price` decimal(10,2) unsigned NOT NULL DEFAULT '0.00' COMMENT '课程销售价格，设置为0则可免费观看',
          `lesson_num` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '总课时',
          `cover` varchar(255) CHARACTER SET utf8 NOT NULL COMMENT '课程封面图片路径',
          `buy_count` bigint(10) unsigned NOT NULL DEFAULT '0' COMMENT '销售数量',
          `view_count` bigint(10) unsigned NOT NULL DEFAULT '0' COMMENT '浏览数量',
          `version` bigint(20) unsigned NOT NULL DEFAULT '1' COMMENT '乐观锁',
          `status` varchar(10) NOT NULL DEFAULT 'Draft' COMMENT '课程状态 Draft未发布  Normal已发布',
          `is_deleted` tinyint(3) DEFAULT NULL COMMENT '逻辑删除 1（true）已删除， 0（false）未删除',
          `gmt_create` datetime NOT NULL COMMENT '创建时间',
          `gmt_modified` datetime NOT NULL COMMENT '更新时间',
          PRIMARY KEY (`id`),
          KEY `idx_title` (`title`),
          KEY `idx_subject_id` (`subject_id`),
          KEY `idx_teacher_id` (`teacher_id`)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 ROW_FORMAT=COMPACT COMMENT='课程';
        
        #
        # Data for table "edu_course"
        #
        
        INSERT INTO `edu_course` VALUES ('1192252213659774977','1189389726308478977','1178214681139539969','1178214681118568449','java基础课程：test',0.01,2,'https://guli-file-190513.oss-cn-beijing.aliyuncs.com/cover/default.gif',4,387,1,'Normal',0,'2019-11-07 09:27:33','2019-11-18 13:35:03'),('14','1189389726308478977','1101348944971091969','1101348944920760321','XHTML CSS2 JS整站制作教程课程学习',0.00,3,'http://guli-file.oss-cn-beijing.aliyuncs.com/cover/2019/03/13/d0086eb0-f2dc-45f7-bba1-744d95e5be0f.jpg',3,44,15,'Normal',0,'2018-04-02 18:33:34','2019-11-16 21:21:45'),('15','1189389726308478977','1101348944971091969','1101348944920760321','HTML5入门课程学习',0.00,23,'http://guli-file.oss-cn-beijing.aliyuncs.com/cover/2019/03/13/22997b8e-3606-4d2e-9b4f-09f48418b6e4.jpg',0,51,17,'Normal',0,'2018-04-02 18:34:32','2019-11-12 10:19:20'),('18','1189389726308478977','1178214681139539969','1178214681118568449','Java精品课程',0.01,20,'http://guli-file.oss-cn-beijing.aliyuncs.com/cover/2019/03/06/866e9aca-b530-4f71-a690-72d4a4bfd1e7.jpg',151,737,6,'Normal',0,'2018-04-02 21:28:46','2019-11-18 11:14:52');
 *  `edu_chapter课程章节表`
    
        CREATE TABLE `edu_chapter` (
          `id` char(19) NOT NULL COMMENT '章节ID',
          `course_id` char(19) NOT NULL COMMENT '课程ID',
          `title` varchar(50) NOT NULL COMMENT '章节名称',
          `sort` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '显示排序',
          `gmt_create` datetime NOT NULL COMMENT '创建时间',
          `gmt_modified` datetime NOT NULL COMMENT '更新时间',
          PRIMARY KEY (`id`),
          KEY `idx_course_id` (`course_id`)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 ROW_FORMAT=COMPACT COMMENT='课程';
        
        #
        # Data for table "edu_chapter"
        #
        
        INSERT INTO `edu_chapter` VALUES ('1','14','第一章：HTML',0,'2019-01-01 12:27:40','2019-01-01 12:55:30'),('1181729226915577857','18','第七章：I/O流',70,'2019-10-09 08:32:58','2019-10-09 08:33:20'),('1192252428399751169','1192252213659774977','第一章节',0,'2019-11-07 09:28:25','2019-11-07 09:28:25'),('15','18','第一章：Java入门',0,'2019-01-01 12:27:40','2019-10-09 09:13:19'),('3','14','第二章：CSS',0,'2019-01-01 12:55:35','2019-01-01 12:27:40'),('32','18','第二章：控制台输入和输出',0,'2019-01-01 12:27:40','2019-01-01 12:27:40'),('44','18','第三章：控制流',0,'2019-01-01 12:27:40','2019-01-01 12:27:40'),('48','18','第四章：类的定义',0,'2019-01-01 12:27:40','2019-01-01 12:27:40'),('63','18','第五章：数组',0,'2019-01-01 12:27:40','2019-01-01 12:27:40'),('64','18','第六章：继承',61,'2019-01-01 12:27:40','2019-10-09 08:32:47');

--------------------

### 二、使用代码生成器生成课程相关代码 ###

只需要在 `CodeGenerator` 类中修改数据库表即可，即 `strategy.setInclude("edu_course", "edu_course_description", "edu_chapter", "edu_video")`

public class CodeGenerator {
    
        @Test
        public void run() {
    
            // 1、创建代码生成器
            AutoGenerator mpg = new AutoGenerator();
    
            // 2、全局配置
            GlobalConfig gc = new GlobalConfig();
            String projectPath = System.getProperty("user.dir");
            gc.setOutputDir("D:\\IDEA\\guli_parent\\service\\service_edu" + "/src/main/java"); //输出目录
    
            gc.setAuthor("jyu_zwy"); //作者名
            gc.setOpen(false); //生成后是否打开资源管理器
            gc.setFileOverride(false); //重新生成时文件是否覆盖
    
            gc.setServiceName("%sService");	//去掉Service接口的首字母I
            gc.setIdType(IdType.ID_WORKER_STR); //主键策略
            gc.setDateType(DateType.ONLY_DATE);//定义生成的实体类中日期类型
            gc.setSwagger2(true);//开启Swagger2模式
    
            mpg.setGlobalConfig(gc);
    
            // 3、数据源配置
            DataSourceConfig dsc = new DataSourceConfig();
            dsc.setUrl("jdbc:mysql://localhost:3306/guli?useUnicode=true&characterEncoding=UTF-8&serverTimeZone=UTC");
            dsc.setDriverName("com.mysql.cj.jdbc.Driver");
            dsc.setUsername("root");
            dsc.setPassword("abc123");
            dsc.setDbType(DbType.MYSQL);
            mpg.setDataSource(dsc);
    
            // 4、包配置
            PackageConfig pc = new PackageConfig();
    
            //生成包：com.atguigu.eduservice
            pc.setModuleName("eduservice"); //模块名
            pc.setParent("com.atguigu");
    
            //生成包：com.atguigu.controller
            pc.setController("controller");
            pc.setEntity("entity");
            pc.setService("service");
            pc.setMapper("mapper");
            mpg.setPackageInfo(pc);
    
            // 5、策略配置
            StrategyConfig strategy = new StrategyConfig();
            strategy.setInclude("edu_course", "edu_course_description", "edu_chapter", "edu_video");//根据数据库哪张表生成，有多张表就加逗号继续填写
    
            strategy.setNaming(NamingStrategy.underline_to_camel);//数据库表映射到实体的命名策略
            strategy.setTablePrefix(pc.getModuleName() + "_"); //生成实体时去掉表前缀
    
            strategy.setColumnNaming(NamingStrategy.underline_to_camel);//数据库表字段映射到实体的命名策略
            strategy.setEntityLombokModel(true); // lombok 模型 @Accessors(chain = true) setter链式操作
    
            strategy.setRestControllerStyle(true); //restful api风格控制器
            strategy.setControllerMappingHyphenStyle(true); //url中驼峰转连字符
    
            mpg.setStrategy(strategy);
    
    
            // 6、执行
            mpg.execute();
    
        }
    }

因为课程简介是依赖于课程的，所以删掉`EduCourseDescriptionController` 类。

--------------------

## 课程管理【添加课程信息】 ##

### 一、后端实现 ###

#### 1. 实体类 ####

在 `vo` 包下创建 `CourseInfoVo` 类封装表单提交数据。

@ApiModel(value = "课程基本信息", description = "编辑课程基本信息的表单对象")
    @Data
    public class CourseInfoVo {
    
        @ApiModelProperty(value = "课程ID")
        private String id;
    
        @ApiModelProperty(value = "课程讲师ID")
        private String teacherId;
    
        @ApiModelProperty(value = "课程专业ID")
        private String subjectId;
    
        @ApiModelProperty(value = "课程标题")
        private String title;
    
        @ApiModelProperty(value = "课程销售价格，设置为0则可免费观看")
        private BigDecimal price;
    
        @ApiModelProperty(value = "总课时")
        private Integer lessonNum;
    
        @ApiModelProperty(value = "课程封面图片路径")
        private String cover;
    
        @ApiModelProperty(value = "课程简介")
        private String description;
    }

#### 2. controller层 ####

@RestController
    @CrossOrigin
    @RequestMapping("/eduservice/course")
    public class EduCourseController {
    
        @Autowired
        private EduCourseService courseService;
    
        // 添加课程基本信息方法
        @PostMapping("addCourseInfo")
        public R addCourseInfo(@RequestBody CourseInfoVo courseInfoVo) {
            courseService.saveCourseInfo(courseInfoVo);
            return R.ok();
        }
    }

#### 3. service层 ####

`EduCourseService`:

public interface EduCourseService extends IService<EduCourse> {
    
        // 添加课程基本信息
        void saveCourseInfo(CourseInfoVo courseInfoVo);
    }

`EduCourseServiceImpl`:

@Service
    public class EduCourseServiceImpl extends ServiceImpl<EduCourseMapper, EduCourse> implements EduCourseService {
    
        // 课程描述的注入
        @Autowired
        private EduCourseDescriptionService courseDescriptionService;
    
    
        // 添加课程基本信息
        @Override
        public void saveCourseInfo(CourseInfoVo courseInfoVo) {
    
            // 1.向课程表中添加课程基本信息
            // CourseInfo 对象 转换成 EduCourse对象
            EduCourse eduCourse = new EduCourse();
            BeanUtils.copyProperties(courseInfoVo, eduCourse);
            int result = baseMapper.insert(eduCourse);
    
            if (result <= 0) { // 表示添加失败
                throw new GuliException(20001, "添加课程信息失败");
            }
    
            // 2.向课程简介表添加课程简介
            // edu_course_description
            EduCourseDescription eduCourseDescription = new EduCourseDescription();
            eduCourseDescription.setDescription(courseInfoVo.getDescription());
            courseDescriptionService.save(eduCourseDescription);
        }
    }

#### 4. 测试 ####

防止测试报错，需要提前做一下操作：

1.  **在 `Entity` 中 `EduCourse` 和 `EduCourseDescription` 中的创建时间和更新时间中加入对应的注解。**  
    `EduCourse`:
    
        @ApiModelProperty(value = "创建时间")
            @TableField(fill = FieldFill.INSERT)
            private Date gmtCreate;
        
            @ApiModelProperty(value = "更新时间")
            @TableField(fill = FieldFill.INSERT_UPDATE)
            private Date gmtModified;
    
    `EduCourseDescription`:
    
        @ApiModelProperty(value = "创建时间")
            @TableField(fill = FieldFill.INSERT)
            private Date gmtCreate;
        
            @ApiModelProperty(value = "更新时间")
            @TableField(fill = FieldFill.INSERT_UPDATE)
            private Date gmtModified;
2.  **把数据库表 `edu_course` 的 `subject_parent_id` 字段设置为可以为 `null`**  
    ![在这里插入图片描述][168fbf1da25545679c54fd315a23b092.png]  
    
3.  **启动项目后，访问[http://localhost:8001/swagger-ui.html][http_localhost_8001_swagger-ui.html]**  
    ![在这里插入图片描述][18b4ab9d9ee649d29977eb63dca5e2fc.png]  
      
    ![在这里插入图片描述][cf16448050a3464a9a1ebf69d48cc650.png]  
      
    `edu_course`:  
    ![在这里插入图片描述][8257b225e6aa4c058d6e82e6de4089e9.png]  
      
    `edu_course_description`:  
    ![在这里插入图片描述][7331f195c6dc4659bbfe8089473a2d7a.png]

#### 5. 优化 ####

1.  **问题**  
    `edu_course` 课程信息表 和 `edu_course_description` 课程描述表之间没有关联。  
    添加进去的数据 `id` 不一样，没有进行一对一的关联。  
    ![在这里插入图片描述][e00722770a0a481fb75404c6d376cf18.png]  
    
2.  **修改 `EduCourseServiceImpl` 代码**
    
        @Service
        public class EduCourseServiceImpl extends ServiceImpl<EduCourseMapper, EduCourse> implements EduCourseService {
        
            // 课程描述的注入
            @Autowired
            private EduCourseDescriptionService courseDescriptionService;
        
        
            // 添加课程基本信息
            @Override
            public void saveCourseInfo(CourseInfoVo courseInfoVo) {
        
                // 1.向课程表中添加课程基本信息
                // CourseInfo 对象 转换成 EduCourse对象
                EduCourse eduCourse = new EduCourse();
                BeanUtils.copyProperties(courseInfoVo, eduCourse);
                int result = baseMapper.insert(eduCourse);
        
                if (result <= 0) { // 表示添加失败
                    throw new GuliException(20001, "添加课程信息失败");
                }
        
                // 获取添加之后课程信息的id
                String cid = eduCourse.getId();
        
                // 2.向课程简介表添加课程简介
                // edu_course_description
                EduCourseDescription eduCourseDescription = new EduCourseDescription();
                eduCourseDescription.setDescription(courseInfoVo.getDescription());
        
                // 手动设置描述课程表的id，与上面的课程信息表id关联
                eduCourseDescription.setId(cid);
        
                courseDescriptionService.save(eduCourseDescription);
        
            }
        }
    
    ![在这里插入图片描述][d04de8fcdaff47f5be681f4dbee55a2c.png]
3.  **修改 `EduCourseDescription` 的 `id` 生成策略，设置为 `手动输入`**
    
    ![在这里插入图片描述][41df39378da84162afa44e71193d5a2b.png_pic_center]  
    
4.  **修改controller，添加返回课程id**
    
        @RestController
        @CrossOrigin
        @RequestMapping("/eduservice/course")
        public class EduCourseController {
        
            @Autowired
            private EduCourseService courseService;
        
            // 添加课程基本信息方法
            @PostMapping("addCourseInfo")
            public R addCourseInfo(@RequestBody CourseInfoVo courseInfoVo) {
                // 返回添加之后课程id，为了后面的添加大纲使用
                String id = courseService.saveCourseInfo(courseInfoVo);
                return R.ok().data("courseId", id);
            }
        }
5.  **修改service,返回String**
    
        public interface EduCourseService extends IService<EduCourse> {
        
            // 添加课程基本信息
            String saveCourseInfo(CourseInfoVo courseInfoVo);
        }
6.  **测试**  
    ![在这里插入图片描述][6c11dcd2b18144bdbbf84c8a1e403204.png]  
      
    ![在这里插入图片描述][701c0987a1704fcea7b400c61fc9be1a.png]  
      
    ![在这里插入图片描述][1784f402b09448529c1a4f04a8d71c90.png]

--------------------

### 二、前端实现 ###

#### 1. 添加路由 ####

{
        // 地址输入
        path: '/course',
        component: Layout,
        // redirect: 重定向地址
        redirect: '/course/list',
        name: '课程管理',
        // title：显示标签  icon：显示图标
        meta: { title: '课程管理', icon: 'example' },
        children: [
          {
            path: 'list',
            name: '课程列表',
            component: () => import('@/views/edu/course/list'),
            meta: { title: '课程列表', icon: 'table' }
          },
          {
            path: 'info',
            name: '添加课程',
            component: () => import('@/views/edu/course/info'),
            meta: { title: '添加课程', icon: 'tree' }
          },
          {
            path: 'info/:id',
            name: 'EduCourseInfoEdit',
            component: () => import('@/views/edu/course/info'),
            meta: { title: '编辑课程基本信息', noCache: true },
            hidden: true
            },
            {
            path: 'chapter/:id',
            name: 'EduCourseChapterEdit',
            component: () => import('@/views/edu/course/chapter'),
            meta: { title: '编辑课程大纲', noCache: true },
            hidden: true
            },
            {
            path: 'publish/:id',
            name: 'EduCoursePublishEdit',
            component: () => import('@/views/edu/course/publish'),
            meta: { title: '发布课程', noCache: true },
            hidden: true
            }
        ]
      },

#### 2. 添加vue组件 ####

![在这里插入图片描述][97fa12d370064e0083d3b7f304ab790c.png]

#### 3. 整合步骤条组件 ####

1.  **课程信息页面 `info.vue`**

1.  **课程大纲页面 `chapter.vue`**

.<template>
      <div class="app-container">
        <h2 style="text-align: center">发布新课程</h2>
        <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
          <el-step title="填写课程基本信息" />
          <el-step title="创建课程大纲" />
          <el-step title="最终发布" />
        </el-steps>
        <el-form label-width="120px">
          <el-form-item>
            <el-button @click="previous">上一步</el-button>
            <el-button :disabled="saveBtnDisabled" type="primary" @click="next"
              >下一步</el-button
            >
          </el-form-item>
        </el-form>
      </div>
    </template>
    
    <script>
    export default {
      data() {
        return {
          saveBtnDisabled: false,
        };
      },
    
        created() {
        
      },
    
      methods: {
        //跳转到上一步
        previous() {
          this.$router.push({ path: "/course/info/1" });
        },
        next() {
          //跳转到第三步
          this.$router.push({ path: "/course/publish/1" });
        },
      }
      
    };
    </script>
    
    <style>
    </style>

1.  **课程发布页面 `publish.vue`**

.<template>
      <div class="app-container">
        <h2 style="text-align: center">发布新课程</h2>
        <el-steps :active="3" process-status="wait" align-center style="margin-bottom: 40px;">
          <el-step title="填写课程基本信息" />
          <el-step title="创建课程大纲" />
          <el-step title="最终发布" />
        </el-steps>
        <el-form label-width="120px">
          <el-form-item>
            <el-button @click="previous">返回修改</el-button>
            <el-button :disabled="saveBtnDisabled" type="primary" @click="publish"
              >发布课程</el-button
            >
          </el-form-item>
        </el-form>
      </div>
    </template>
    
    <script>
    export default {
      data() {
        return {
          saveBtnDisabled: false,
        };
      },
    
      methods: {
        //跳转到上一步
        previous() {    
          this.$router.push({ path: "/course/chapter/1" });
        },
        publish(){
          this.$router.push({ path: "/course/list" });
        }
    
      },
    
    };
    </script>
    
    <style>
    </style>

![在这里插入图片描述][64d779194d04486eac117cbba5efce18.png]  
  
![在这里插入图片描述][fc0c0018b4714dc0b0df743e8edde48d.png]  
  
![在这里插入图片描述][26223f685ffe40629697beb90cbd60e1.png]

--------------------

## 课程管理【编辑课程基本信息】 ##

### 一、前端实现 ###

#### 1. 定义api ####

import request from '@/utils/request' // 引入已经封装好的axios 和 拦截器
    
    export default {
    
        // 添加课程信息
        addCourseInfo(courseInfo) {
            return request({
                url: `/eduservice/course/addCourseInfo`,
                method: 'post', 
                data: courseInfo
              })
        }
    }

#### 2. 组件模板 ####

<template>
      <div class="app-container">
        <h2 style="text-align: center">发布新课程</h2>
        <el-steps :active="1" process-status="wait" align-center style="margin-bottom: 40px;">
          <el-step title="填写课程基本信息" />
          <el-step title="创建课程大纲" />
          <el-step title="最终发布" />
        </el-steps>
    
        <el-form label-width="120px">
          <el-form-item label="课程标题">
            <el-input
              v-model="courseInfo.title"
              placeholder=" 示例：机器学习项目课：从基础到搭建项目视频课程。专业名称注意大小写"
            />
          </el-form-item>
    
          
    
          
    
          <el-form-item label="总课时">
            <el-input-number
              :min="0"
              v-model="courseInfo.lessonNum"
              controls-position="right"
              placeholder="请填写课程的总课时数"
            />
          </el-form-item>
    
          
          <el-form-item label="课程简介">
            <el-input v-model="courseInfo.description" placeholder="" />
          </el-form-item>
    
          
    
          <el-form-item label="课程价格">
            <el-input-number
              :min="0"
              v-model="courseInfo.price"
              controls-position="right"
              placeholder="免费课程请设置为0元"
            />
            元
          </el-form-item>
    
          <el-form-item>
            <el-button
              :disabled="saveBtnDisabled"
              type="primary"
              @click="saveOrUpdate"
              >保存并下一步</el-button
            >
          </el-form-item>
        </el-form>
      </div>
    </template>
    
    <script>
    
    import course from "@/api/edu/course"
    
    export default {
      data() {
        return {
          saveBtnDisabled:false,
          courseInfo: {
            title: "",
              subjectId: "",
              teacherId: "",
              lessonNum: 0,
              description: "",
              cover: "",
              price: 0,
          },
        };
      },
    
        created(){
    
        },
    
      methods: {
        saveOrUpdate() {
            course.addCourseInfo(this.courseInfo)
                .then(response => {
                    // 提示
                    this.$message({
                        message: "添加课程信息成功",
                        type: "success",
                        })
                    //跳转到第二步
                    this.$router.push({ path: "/course/chapter/"+response.data.courseId})
                })
            
        }
      }
    };
    </script>
    
    <style></style>

#### 3. 测试 ####

![在这里插入图片描述][63f756df613b47d4984b9813648a74a2.png]  
  
![在这里插入图片描述][2dae5108083b4e9e800d4fe5c223c236.png_pic_center]

![在这里插入图片描述][6c792e29ad924b41912edbf7adbdd8eb.png]

--------------------

### 二、讲师下拉列表实现 ###

#### 1. 组件模板 ####

`src\views\edu\course\info.vue`

<el-form-item label="课程讲师">
            <el-select v-model="courseInfo.teacherId" placeholder="请选择">
                <el-option
                        v-for="teacher in teacherLists"
                        :key="teacher.id"
                        :label="teacher.name"
                        :value="teacher.id"
                        ></el-option>
            </el-select>
        </el-form-item>

#### 2. 定义api ####

`src\api\edu\course.js`

// 查询所有讲师
        getListTeacher(){
            return request({
                url:"/eduservice/edu-teacher/findAll",
                method: 'get',
            })
        }

#### 3. 组件js ####

### 4. 测试 ###

![在这里插入图片描述][944a2ea9e2a3454ba31a344d4a3f1cf8.png]  
  
![在这里插入图片描述][cc2865337728439ba411b02227fe09f3.png]

--------------------

### 三、课程分类多级联动的实现 ###

#### 1. 级联显示一级分类 ####

1.  **组件数据定义**  
    定义在 `data` 中：
    
        subjectOneList: [], //封装所以一级分类数据
        subjectTwoList: [], //封装二级分类数据
2.  **组件模板**
    
        <el-form-item label="课程分类">
            <el-select
               v-model="courseInfo.subjectParentId"
               placeholder="一级分类"
                @change="subjectLevelOneChanged">
                    <el-option
                        v-for="subject in subjectOneList"
                        :key="subject.id"
                        :label="subject.title"
                        :value="subject.id"
                        ></el-option>
            </el-select>
        </el-form-item>
3.  **组件js**
    
        <script>
        
        import course from "@/api/edu/course"
        import subject from "@/api/edu/subject"
        
        export default {
          data() {
           		........
              subjectOneList:[], // 一级分类
              subjectTwoList:[], // 二级分类
            };
          },
        
            created(){
                .....
                // 初始化一级分类
                this.getOneSubject()
            },
        
          methods: {
            // 查询所有的一级分类
            getOneSubject() {
                subject.getSubjectList() 
                    .then(response => {
                        this.subjectOneList = response.data.list
                    })
            },
        	.......
                
            }
          }
        };
        </script>
4.  **测试**  
    ![在这里插入图片描述][4ecb75f08f264f03aa377951bc49c074.png]

--------------------

#### 1. 级联显示二级分类 ####

1.  **组件模板**
    
        <el-select v-model="courseInfo.subjectId" placeholder="二级分类">
                <el-option
                       v-for="subject in subjectTwoList"
                       :key="subject.id"
                       :label="subject.title"
                       :value="subject.id"
                       ></el-option>
                </el-select>
2.  **注册change事件**  
    在一级分类的 `< el-select >` 组件中注册 `change` 事件:  
    ![在这里插入图片描述][25427fa980db484db9c9579fae77c495.png]
3.  **定义change事件方法**
    
        // 点击某一级分类，触发change，显示对应的二级分类
            subjectLevelOneChanged(value) {
                // value就是一级分类的id值
                // 遍历所有的分类，包含一级和二级
                for  (let i = 0; i < this.subjectOneList.length; i ++ ) {
                    // subjectOneList[i]: 每个一级分类
                    // 判断：所有一级分类id 和 点击一级分类id是否一样
                    if (this.subjectOneList[i].id === value) {
                        // 从一级分类获取里面所有的二级分类
                        this.subjectTwoList = this.subjectOneList[i].children;
                       // 把二级分类id值清空
                    	this.courseInfo.subjectId = "";
                    }
                }
                
            },
4.  **测试**  
    ![在这里插入图片描述][876d73d478ce4a80891513ead7694889.png]

--------------------

### 四、课程封面 ###

#### 1. 定义data数据 ####

BASE_API: process.env.BASE_API, // 接口API地址

#### 2. 组件模板 ####

<el-form-item label="课程封面">
                <el-upload
                        :show-file-list="false"
                        :on-success="handleAvatarSuccess"
                        :before-upload="beforeAvatarUpload"
                        :action="BASE_API + '/eduoss/fileoss'"
                        class="avatar-uploader"
                        >
                    <img :src="courseInfo.cover" style="width: 200px; height: 150px"/>
                </el-upload>
            </el-form-item>

#### 3. 结果回调 ####

// 上传封面成功调用的方法
        handleAvatarSuccess(res, file) {
            this.courseInfo.cover = res.data.url
        },
    
        // 上转之前调用的方法
        beforeAvatarUpload(file) {
            const isJPG = file.type === "image/jpeg";
            const isLt2M = file.size / 1024 / 1024 < 2;
            if (!isJPG) {
                this.$message.error("上传头像图片只能是 JPG 格式!");
            }
            if (!isLt2M) {
                this.$message.error("上传头像图片大小不能超过 2MB!");
            }
            return isJPG && isLt2M;
        },

#### 4. 测试 ####

![在这里插入图片描述][e6514ba0357f4000b5adb3e8b63b3007.png]  
  
![在这里插入图片描述][25379713e45546a5a86b924242a83981.png]  
  
  
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