一、返回操作是否成功

1、删除业务逻辑

TeacherServiceImpl

@Override
public boolean removeById(Serializable id) {
  Integer result = baseMapper.deleteById(id);
  return null != result && result > 0;
}

TeacherAdminController

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

2、前端

在catch中处理错误信息