​

–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

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