一、新增章节

web层

@ApiOperation(value = "新增章节")
@PostMapping
public R save(
   @ApiParam(name = "chapterVo", value = "章节对象", required = true)
   @RequestBody Chapter chapter){
   chapterService.save(chapter);
   return R.ok();
}

二、根据id查询

web层

@ApiOperation(value = "根据ID查询章节")
@GetMapping("{id}")
public R getById(
   @ApiParam(name = "id", value = "章节ID", required = true)
   @PathVariable String id){
   Chapter chapter = chapterService.getById(id);
   return R.ok().data("item", chapter);
}

三、更新

web层

@ApiOperation(value = "根据ID修改章节")
@PutMapping("{id}")
public R updateById(
  @ApiParam(name = "id", value = "章节ID", required = true)
  @PathVariable String id,
  @ApiParam(name = "chapter", value = "章节对象", required = true)
  @RequestBody Chapter chapter){
  chapter.setId(id);
  chapterService.updateById(chapter);
  return R.ok();
}

四、删除

1、web层

@ApiOperation(value = "根据ID删除章节")
@DeleteMapping("{id}")
public R removeById(
  @ApiParam(name = "id", value = "章节ID", required = true)
  @PathVariable String id){
  boolean result = chapterService.removeChapterById(id);
  if(result){
      return R.ok();
  }else{
      return R.error().message("删除失败");
  }
}

2、Service

ChapterService层：接口

boolean removeChapterById(String id);

ChapterService层：实现

@Override
public boolean removeChapterById(String id) {
  //根据id查询是否存在视频，如果有则提示用户尚有子节点
  if(videoService.getCountByChapterId(id)){
      throw new GuliException(20001,"该分章节下存在视频课程，请先删除视频课程");
  }
  Integer result = baseMapper.deleteById(id);
  return null != result && result > 0;
}

VideoService：接口

boolean getCountByChapterId(String chapterId);

VideoService：实现

@Override
public boolean getCountByChapterId(String chapterId) {
  QueryWrapper<Video> queryWrapper = new QueryWrapper<>();
  queryWrapper.eq("chapter_id", chapterId);
  Integer count = baseMapper.selectCount(queryWrapper);
  return null != count && count > 0;

}

五、Swagger测试