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@H_502_31@ * from@H_502_31@ ( select@H_502_31@ t.*,rownum rn from@H_502_31@ ( select@H_502_31@ a.*,b.name as@H_502_31@ classname from@H_502_31@ T_DBSET a left@H_502_31@ join@H_502_31@ t_dbclass b on@H_502_31@ a.classid=b.id where@H_502_31@ a.classId in@H_502_31@( select@H_502_31@ id from@H_502_31@ t_dbclass start@H_502_31@ with@H_502_31@ id = 'fddbfb7b898544aab4dd9840b8cc46bc'@H_502_31@ connect@H_502_31@ by@H_502_31@ prior@H_502_31@ id = fartherid ) ) t ) where@H_502_31@ rn >0@H_502_31@ and@H_502_31@ rn<=30@H_502_31@@H_502_31@