idea JPA写法

 

无参数查询：

 //无参的查找
    @Query("select  id,folderName from FolderEntity ")
    public List<FolderEntity> findIdAndFolderName();

查找方法可以使用自定义findIdAndFolderName()调用，也可使用findAll()及jdk8新方法使用：

   List<FolderEntity> folderList=this.folderRepository.findAll();
            List<String> folderNames=folderList.stream().map(FolderEntity::getFolderName).collect(Collectors.toList());
            folderNames.forEach(s -> {if(s==request.getFolderName()) {
                System.out.println("文件夹名称重复");
            } else{
                BeanUtils.copyProperties(request, folderEntity);
            }
            });

有参数查询：

@Query("select  id,folderName from FolderEntity where folderName=:folderName")
    public List<FolderEntity> findIdAndFolderName(String folderName);