Plsql 使用PL/SQL检索层次结构中具有节点的根
我有一个简单的父/子类型视图,有两列:Plsql 使用PL/SQL检索层次结构中具有节点的根,plsql,hierarchy,Plsql,Hierarchy,我有一个简单的父/子类型视图,有两列:MYID和MYPARENTID。在PL/SQL中,获取父级的所有子级的列表非常简单: SELECT MYID FROM MYVIEW START WITH MYID = 'TargetId1' CONNECT BY PRIOR MYID = MYPARENTID 我会得到这样的回报: MYID ----------- TargetId1 TargetId1Child1 TargetId1Grandchild1 MYID --------- Targ
MYID
和MYPARENTID
。在PL/SQL中,获取父级的所有子级的列表非常简单:
SELECT MYID
FROM MYVIEW
START WITH MYID = 'TargetId1'
CONNECT BY PRIOR MYID = MYPARENTID
我会得到这样的回报:
MYID
-----------
TargetId1
TargetId1Child1
TargetId1Grandchild1
MYID
---------
TargetId1
TargetId1Child1
TargetId1Grandchild1
TargetId2
TargetId2Child2
TargetId2Grandchild1
TargetId3
TargetId3Child3
TargetId3Grandchild1
MYID ROOT
----------------------------------
TargetId1 TargetId1
TargetId1Child1 TargetId1
TargetId1Grandchild1 TargetId1
TargetId2 TargetId2
TargetId2Child2 TargetId2
TargetId2Grandchild2 TargetId2
TargetId3 TargetId3
TargetId3Child3 TargetId3
TargetId3Grandchild3 TargetId3
但现在让我们说,我想同时为一组父母做这件事:
SELECT MYID
FROM MYVIEW
START WITH MYID IN ('TargetId1', 'TargetId2', 'TargetId3')
CONNECT BY PRIOR MYID = MYPARENTID
我的结果如下所示:
MYID
-----------
TargetId1
TargetId1Child1
TargetId1Grandchild1
MYID
---------
TargetId1
TargetId1Child1
TargetId1Grandchild1
TargetId2
TargetId2Child2
TargetId2Grandchild1
TargetId3
TargetId3Child3
TargetId3Grandchild1
MYID ROOT
----------------------------------
TargetId1 TargetId1
TargetId1Child1 TargetId1
TargetId1Grandchild1 TargetId1
TargetId2 TargetId2
TargetId2Child2 TargetId2
TargetId2Grandchild2 TargetId2
TargetId3 TargetId3
TargetId3Child3 TargetId3
TargetId3Grandchild3 TargetId3
当我这样做时,我就失去了知道特定子节点来自何处的能力。我得到一个孩子列表,但我想知道每个孩子来自哪个根(本质上是以值开头)
我想要一个如下所示的结果集:
MYID
-----------
TargetId1
TargetId1Child1
TargetId1Grandchild1
MYID
---------
TargetId1
TargetId1Child1
TargetId1Grandchild1
TargetId2
TargetId2Child2
TargetId2Grandchild1
TargetId3
TargetId3Child3
TargetId3Grandchild1
MYID ROOT
----------------------------------
TargetId1 TargetId1
TargetId1Child1 TargetId1
TargetId1Grandchild1 TargetId1
TargetId2 TargetId2
TargetId2Child2 TargetId2
TargetId2Grandchild2 TargetId2
TargetId3 TargetId3
TargetId3Child3 TargetId3
TargetId3Grandchild3 TargetId3
我怎样才能做到这一点?我不知道PL/SQL,但您可以:
- 将TargetId列表插入临时表
- 将临时表与视图连接起来
例如
我不知道PL/SQL,但您可以:
- 将TargetId列表插入临时表
- 将临时表与视图连接起来
例如
我自己还没有用过,但根据我对您问题的理解,我认为您正在寻找的是通过根连接的操作符。但需要Oracle 10g
SELECT MYID
,CONNECT_BY_ROOT MYID ROOT
FROM MYVIEW
START WITH MYID IN ('TargetId1', 'TargetId2', 'TargetId3')
CONNECT BY PRIOR MYID = MYPARENTID
我自己还没有用过,但根据我对您问题的理解,我认为您正在寻找的是通过根连接的操作符。但需要Oracle 10g
SELECT MYID
,CONNECT_BY_ROOT MYID ROOT
FROM MYVIEW
START WITH MYID IN ('TargetId1', 'TargetId2', 'TargetId3')
CONNECT BY PRIOR MYID = MYPARENTID
所讨论的sql代码将由web服务生成和执行;我认为带有DB的SLA不允许我们使用临时表来完成操作;我认为带有DB的SLA不允许我们使用临时表来完成操作。