Oracle 树操作

 select…start with…connect by…prior

1.查找一个节点的所有直属子节点（节点本身+所有后代），有以下两种写法。

select id, typename, typecode, parentid, ordernum
from purchase_type
where status = 1
　　start with id = ‘15‘
　　connect by parentid = prior id　　order siblings by ordernum

或

select id, typename, typecode, parentid, ordernum
from purchase_type
where status = 1
　　start with id = ‘15‘
　　connect by prior id = parentid
　　order siblings by ordernum

显示结果：

2.查找一个节点的所有直属父节点（节点本身+所有祖宗（父类的父类....））。

select id, typename, typecode, parentid, ordernumfrom purchase_typewhere status = 1　　start with id = ‘136‘　　connect by id = prior parentid　　order siblings by ordernum

或

select id, typename, typecode, parentid, ordernum
from purchase_type
where status = 1
    start with id = ‘136‘
    connect by prior parentid = id
    order siblings by ordernum

显示结果：