太简单的两篇递归循环
orcale 在项目里递归循环实战

先看资产表T_ATOM_ASSET结构

看业务类别表T_ATOM_BUSI_CATEGORY结构

问题出现

页面显示

实际对应的归属业务分类

涉及到oracle递归实战(这里不会如何直接在atomAsset的seelct里面处理递归回显)

直接在实现层看atomAssetMapper和atomBusiCategoryMapper处理(这里转来转去数据格式，不知道有啥简单方法不)
impl

    @Override
    public PageResult<AtomAsset> queryAll(AtomAssetQueryCriteria criteria, Page<Object> page){
        IPage<AtomAsset> all = atomAssetMapper.findAll(criteria, page);
        List<AtomAsset> records = all.getRecords();


//        根据每条数据类的busiSort递归向下查找归属业务分类
        if(records.size() > 0 ){
            for (int i = 0; i < records.size(); i++) {
                String busiSort = records.get(i).getBusiSort();
//                逗号分隔字符串截取
                String[] split = busiSort.split(",");
//                string[] 转List<String>再转Set<String>-----为了去重
                List<String> strings = new ArrayList<>(Arrays.asList(split));
                Set<String> taskSet  = new LinkedHashSet<>();
                taskSet.addAll(strings);
//                记录最终对应的分类名字结果
                Set<String> taskSetResult  = new LinkedHashSet<>();
                for(String item : taskSet){
//                    根据分类id获取分类名称(递归向下查找)
                    List<String> subCategory = atomBusiCategoryMapper.findSubCategory(Long.parseLong(item));
//                    根据分类id获取当前自己的分类名称
                    String currentCategoryName = atomBusiCategoryMapper.findCategoryNameByCateforyId(Long.parseLong(item));
                    taskSetResult.addAll(subCategory);
                    taskSetResult.add(currentCategoryName);
                }
//                set又转成List返回前端
                records.get(i).setBusiSortName(new ArrayList<>(taskSetResult));
            }
        }
//        System.out.println(all);
        return PageUtil.toPage(all);
    }

直接看AtomBusiCategoryMapper.xml的小小递归写法

    <select id="findSubCategory" resultType="java.lang.String">
            select distinct category_name
            from T_ATOM_BUSI_CATEGORY
            start with superior_id = #{categotyId}
            connect by prior category_id = superior_id
    </select>

    <select id="findCategoryNameByCateforyId" resultType="java.lang.String">
        select category_name
        from T_ATOM_BUSI_CATEGORY
        where category_id = #{categotyId}
    </select>