要在Oracle-Apex中创建树形图,我需要做什么?我已经尝试了所有的方法,但是我不能生成树形图。
我正在尝试使用siguienet查询生成图表:
select case when connect_by_isleaf = 1 then 0
when level = 1 then 1 else -1 end as status,
level,
ename as title,
'icon-tree-folder' as icon,
empno as value,
ename as tooltip,
哪种类型的NoSQL数据库最适合存储分层数据?
举个例子,我想用树形结构存储一个论坛的帖子:
original post
+ re: original post
+ re: original post
+ re2: original post
+ re3: original post
+ re2: original post