--查询全部资源信息

select * from urm_class_info

--向上遍历树，找到路径直到根节点，指定的是parentid

select distinct classid,parentid,name

from urm_class_info

start with parentid = 'cmdb0000000000000017'

connect by prior parentid = classid

--向上遍历树，找到路径直到根节点，指定的是classid，和下面的主要区别就是parentid和classid的位置

select classid,parentid,name

from urm_class_info

start with classid = 'cmdb0000000000000401'

connect by prior parentid = classid

--向下遍历整棵树，可以指定classid，来遍历指定节点的树

select classid,parentid,name

from urm_class_info

start with classid = 'cmdb0000000000000017'

connect by prior classid = parentid

--向下遍历整棵树，可以指定parentid，来遍历指定parentid节点的树，不包含parentid

select classid,parentid,name

from urm_class_info

start with parentid = 'cmdb0000000000000017'

connect by prior classid = parentid