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public interface XcLearningCourseRepository extends JpaRepository<XcLearningCourse, String> {     //根据用户和课程查询选课记录，用于判断是否添加选课     XcLearningCourse findXcLearningCourseByUserIdAndCourseId(String userId, String courseId); }

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public interface XcTaskHisRepository extends JpaRepository<XcTaskHis,String> {   }

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//完成选课  

  @Transactional  

  public ResponseResult addcourse(String userId, String courseId,String valid,Date  startTime,Date endTime,XcTask xcTask){         if (StringUtils.isEmpty(courseId)) {   

         ExceptionCast.cast(LearningCode.LEARNING_GETMEDIA_ERROR);   

     }       

 if (StringUtils.isEmpty(userId)) {  

          ExceptionCast.cast(LearningCode.CHOOSECOURSE_USERISNULL);  

      }   

     if(xcTask == null || StringUtils.isEmpty(xcTask.getId())){  

          ExceptionCast.cast(LearningCode.CHOOSECOURSE_TASKISNULL);   

     }          //查询历史任务      

  Optional<XcTaskHis> optional = xcTaskHisRepository.findById(xcTask.getId());  

      if(optional.isPresent()){        

    return new ResponseResult(CommonCode.SUCCESS);    

    }     

   XcLearningCourse xcLearningCourse =  xcLearningCourseRepository.findXcLearningCourseByUserIdAndCourseId(userId, courseId);         if (xcLearningCourse == null) {//没有选课记录则添加     

       xcLearningCourse = new XcLearningCourse();      

      xcLearningCourse.setUserId(userId);     

       xcLearningCourse.setCourseId(courseId);      

      xcLearningCourse.setValid(valid);       

     xcLearningCourse.setStartTime(startTime);    

        xcLearningCourse.setEndTime(endTime);   

         xcLearningCourse.setStatus("501001");   

         xcLearningCourseRepository.save(xcLearningCourse);  

      } else {//有选课记录则更新日期     

       xcLearningCourse.setValid(valid);    

        xcLearningCourse.setStartTime(startTime);    

        xcLearningCourse.setEndTime(endTime);     

       xcLearningCourse.setStatus("501001");     

       xcLearningCourseRepository.save(xcLearningCourse);     

   }  

     //向历史任务表播入记录

        Optional<XcTaskHis> optional = xcTaskHisRepository.findById(xcTask.getId());   

     if(!optional.isPresent()){      

     //添加历史任务    

        XcTaskHis xcTaskHis = new XcTaskHis();     

       BeanUtils.copyProperties(xcTask,xcTaskHis);    

        xcTaskHisRepository.save(xcTaskHis);

        }

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return new ResponseResult(CommonCode.SUCCESS);     }