oracle 递归查询，向上和向下遍历
--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
selectdistinct 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
selectclassid,parentid,name
from urm_class_info
start with parentid = 'cmdb0000000000000017'
connect by priorclassid= parentid
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