转载自：http://lizhen3708693.iteye.com/blog/1631184

–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,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,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,name
from urm_class_info
start with parentid = ‘cmdb0000000000000017’
connect by prior classid = parentid

相关分页关联查询示例：

select * from ( select t.*,rownum rn from ( select a.*,b.name as classname from T_DBSET a left join t_dbclass b on a.classid=b.id where a.classId in( select id from t_dbclass start with id = 'fddbfb7b898544aab4dd9840b8cc46bc' connect by prior id = fartherid ) ) t ) where rn >0 and rn<=30