一、课程最终发布（后端）

 最终的课程发布信息包含了：课程表中的id，title，price，lesson_num(总课时数)，cover(封面)；课程简介表的课程简介；教师表的教师姓名；课程分类表的一级分类和二级分类。

因此我们需要使用多表查询进行实现。

 1、在EduCourseController中编写代码

    //根据课程id查询课程确认信息
    @GetMapping("getPublishCourseInfo/{id}")
    public R getPublishCourseInfo(@PathVariable String id){
        CoursePublishVo coursePublishVo = courseService.publishCourseInfo(id);
        return R.ok().data("publishCourse",coursePublishVo);
    }

2、在EduCourseService接口中添加publishCourseInfo(id)方法

CoursePublishVo publishCourseInfo(String id);

3、在EduCourseServiceImpl实现类中调用方法得到发布课程信息

    @Override
    public CoursePublishVo publishCourseInfo(String id) {
        //调用mapper
        CoursePublishVo publishCourseInfo = baseMapper.getPublishCourseInfo(id);
        return publishCourseInfo;
    }

　　注意：baseMapper调用的是mapper中方法，多表查询需要我们自己写。

4、在EduCourseMapper接口中添加getPublishCourseInfo方法

public interface EduCourseMapper extends BaseMapper<EduCourse> {
    public CoursePublishVo getPublishCourseInfo(String courseId);
}

5、在EduCourseMapper.xml中添加SQL语句

<!--sql语句：根据课程id查询课程确认信息-->
    <select id="getPublishCourseInfo" resultType="com.atguigu.eduservice.entity.vo.CoursePublishVo">
        SELECT ec.id,ec.title,ec.price,ec.lesson_num AS lessonNum,ec.cover,
                et.name AS teacherName,
                es1.title AS subjectLevelOne,
                es2.title AS subjectLevelTwo
        FROM edu_course ec LEFT OUTER JOIN edu_course_description ecd ON ec.id = ecd.id
                           LEFT OUTER JOIN edu_teacher et ON ec.teacher_id = et.id
                           LEFT OUTER JOIN edu_subject es1 ON ec.subject_parent_id = es1.id
                           LEFT OUTER JOIN edu_subject es2 ON ec.subject_id = es2.id
        WHERE ec.id = #{courseId}
    </select>

　　注意：参数使用#{}；maven默认加载机制只会对-java文件夹下的java类型文件进行加载，.xml文件我们需要自己配置：

解决方法：

（1）将xml文件复制到target目录的相同位置

（2）对配置文件进行配置，让maven默认加载xml文件

• 在pom.xml中进行配置：

 

    <!-- 项目打包时会将java目录中的*.xml文件也进行打包 -->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

 

• 在application.properties中进行配置：

#配置mapper xml文件的路径
mybatis-plus.mapper-locations=classpath:com/atguigu/eduservice/mapper/xml/*.xml

　　至此我们将需要的数据查询出来了，最终发布时只需要将课程表中status状态修改为Normal，即为发布（默认为Draft,未发布）

6、修改课程状态

在EduCourseController中添加接口：

    //课程最终发布
    //修改课程状态
    @PostMapping("publishCourse/{id}")
    public R publishCourse(@PathVariable String id){
        EduCourse eduCourse = new EduCourse();
        eduCourse.setId(id);
        eduCourse.setStatus("Normal");//设置课程发布状态
        courseService.updateById(eduCourse);
        return R.ok();
    }

二、课程最终发布（前端）

1、在api/edu/course.js中添加调用后端接口方法

//课程确认信息显示
    getPublishCourseInfo(id){
        return request({
            url: `/eduservice/edu-course/getPublishCourseInfo/${id}`,
            method: 'get'
          })
    },
    //课程最终发布
    publishCourse(id){
        return request({
            url: `/eduservice/edu-course/publishCourse/${id}`,
            method: 'post'
          })
    }

2、编写course/publish.vue代码实现课程最终发布：

<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="发布课程"/>
    </el-steps>

    <div class="ccInfo">
      <img :src="coursePublish.cover">
      <div class="main">
        <h2>{{ coursePublish.title }}</h2>
        <p class="gray"><span>共{{ coursePublish.lessonNum }}课时</span></p>
        <p><span>所属分类：{{ coursePublish.subjectLevelOne }} — {{ coursePublish.subjectLevelTwo }}</span></p>
        <p>课程讲师：{{ coursePublish.teacherName }}</p>
        <h3 class="red">￥{{ coursePublish.price }}</h3>
      </div>
    </div>

    <div>
      <el-button @click="previous">返回修改</el-button>
      <el-button :disabled="saveBtnDisabled" type="primary" @click="publish">发布课程</el-button>
    </div>
  </div>
</template>

<script>
import course from '@/api/edu/course'
export default {
  data() {
    return {
      saveBtnDisabled: false, // 保存按钮是否禁用
      coursePublish:{},
      courseId:''
    } 
  },

  created() {
    //获取路由课程id值
    if (this.$route.params && this.$route.params.id) {
      this.courseId = this.$route.params.id
      //调用接口方法根据课程id查询
      this.getPublishCourseId()
    }
    
  },

  methods: {
    //根据课程id查询
    getPublishCourseId(){
      course.getPublishCourseInfo(this.courseId)
        .then(response=>{
          this.coursePublish = response.data.publishCourse
        })
    },
    previous() {
      this.$router.push({ path: '/course/chapter/1' })
    },

    publish() {
      this.$confirm('是否发布课程?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        //调用删除的方法
        course.publishCourse(this.courseId)
        .then(response=>{
          //提示信息
          this.$message({
            type: 'success',
            message: '课程发布成功!'
          });
          //跳转到课程列表
          this.$router.push({ path: '/course/list' })
        })
      })
    }
  }
}
</script>
<style scoped>
.ccInfo {
    background: #f5f5f5;
    padding: 20px;
    overflow: hidden;
    border: 1px dashed #DDD;
    margin-bottom: 40px;
    position: relative;
}
.ccInfo img {
    background: #d6d6d6;
    width: 500px;
    height: 278px;
    display: block;
    float: left;
    border: none;
}
.ccInfo .main {
    margin-left: 520px;
}

.ccInfo .main h2 {
    font-size: 28px;
    margin-bottom: 30px;
    line-height: 1;
    font-weight: normal;
}
.ccInfo .main p {
    margin-bottom: 10px;
    word-wrap: break-word;
    line-height: 24px;
    max-height: 48px;
    overflow: hidden;
}

.ccInfo .main p {
    margin-bottom: 10px;
    word-wrap: break-word;
    line-height: 24px;
    max-height: 48px;
    overflow: hidden;
}
.ccInfo .main h3 {
    left: 540px;
    bottom: 20px;
    line-height: 1;
    font-size: 28px;
    color: #d32f24;
    font-weight: normal;
    position: absolute;
}
</style>

　三、课程列表功能（分页-条件查询-删除）

 1、删除课程信息

删除课程信息需要先删除小节，再章节，再描述，最后删除课程本身，接口实现类代码：

    //删除课程
    @Override
    public void removeCourse(String courseId) {
        //1 根据课程id删除小节
        eduVideoService.removeVideoByCourseId(courseId);

        //2 根据课程id删除章节
        eduChapterService.removeChapterByCourseId(courseId);

        //3 根据课程id删除描述
        courseDescriptionService.removeById(courseId);

        //4 根据课程id删除课程本身
        int result = baseMapper.deleteById(courseId);
        if(result==0){//失败返回
            throw new GuliException(20001,"删除失败");
        }
    }

　　

 其他参考教师列表完成

　

 

标签：courseId,18,ec,列表,course,课程,edu,id
来源： https://www.cnblogs.com/ldh-up/p/14600713.html