日期:2014-05-17  浏览次数:20861 次

如何得到所有下级id啊
PK_CORP(公司id) FATHERCORP(上级公司id) UNITNAME(名称) RS (人数)
1001 '' 总部 0
1002 1001 北京 10
1003 1002 天津 10
1004 1003 湖北 10 
1005 1002 上海 10
1006 1001 南京 10

--如何输入pk_corp,能得到下级公司PK_CORP(包含本身,以及下级的下级)
比如:输入1001 返回所有pk_corp
  输入1002 返回 1002,1003,1004,1005
   
   
 CREATE VIEW v_corp
 AS 
 SELECT '1001' pk_corp ,'' FATHERCORP ,'总部' unitname ,0 rs FROM DUAL
 UNION ALL
 SELECT '1002' pk_corp ,'1001' FATHERCORP ,'北京' unitname ,10 rs FROM DUAL 
 UNION ALL
 SELECT '1003' pk_corp ,'1002' FATHERCORP ,'天津' unitname,10 rs FROM DUAL 
 UNION ALL 
 SELECT '1004' pk_corp ,'1003' FATHERCORP ,'湖北' unitname ,10 rs FROM DUAL 
 
 UNION ALL
 SELECT '1005' pk_corp ,'1002' FATHERCORP ,'上海' unitname,10 rs FROM DUAL 
 
 UNION ALL
 SELECT '1006' pk_corp ,'1001' FATHERCORP ,'南京' unitname,10 rs FROM DUAL 
 

------解决方案--------------------
SQL> select * from treeview;

PARENT CHILD
---------- ----------
a b
a c
a e
b b1
b b2
c c1
e e1
e e3
c e

9 rows selected.

SQL> select * from treeview start with parent='c' connect by child=parent;

PARENT CHILD
---------- ----------
c c1
c e

SQL> select * from treeview start with parent='c' connect by prior child=parent;

PARENT CHILD
---------- ----------
c c1
c e
e e1
e e3
------解决方案--------------------
try it ..

SQL code

SQL> select distinct
  2         ltrim(first_value(sys_connect_by_path(pk_corp,',')) over(order by level desc),',') as new_pk_corp
  3    from (
  4          select pk_corp,
  5                 row_number() over(order by pk_corp) as front_values,
  6                 (row_number() over(order by pk_corp))+1 as behind_values
  7            from tablename tt
  8           start with pk_corp = 1002
  9          connect by prior pk_corp = FATHERCORP
 10         )zz
 11  connect by prior behind_values = front_values;

NEW_PK_CORP
--------------------------------------------
1002,1003,1004,1005

------解决方案--------------------
SQL code
-- 树形数据深度排序处理示例(递归法)
--测试数据
CREATE TABLE tb(ID char(3),PID char(3),Name nvarchar(10))
INSERT tb SELECT '001',NULL ,'山东省'
UNION ALL SELECT '002','001','烟台市'
UNION ALL SELECT '004','002','招远市'
UNION ALL SELECT '003','001','青岛市'
UNION ALL SELECT '005',NULL ,'四会市'
UNION ALL SELECT '006','005','清远市'
UNION ALL SELECT '007','006','小分市'
GO

--广度搜索排序函数
CREATE FUNCTION f_Sort(@ID char(3)=NULL,@sort int=1)
RETURNS @t_Level TABLE(ID char(3),sort int)
AS
BEGIN
    DECLARE tb CURSOR LOCAL
    FOR
    SELECT ID FROM tb
    WHERE PID=@ID
        OR(@ID IS NULL AND PID IS NULL)
    OPEN TB
    FETCH tb INTO @ID
    WHILE @@FETCH_STATUS=0
    BEGIN
        INSERT @t_Level VALUES(@ID,@sort)
        SET @sort=@sort+1
        IF @@NESTLEVEL<32 --如果递归层数未超过32层(递归最大允许32层)
        BEGIN
            --递归查找当前节点的子节点
            INSERT @t_Level SELECT * FROM f_Sort(@ID,@sort)
            SET @sort=@sort+@@ROWCOUNT  --排序号加上子节点个数
        END
        FETCH tb INTO @ID
    END
    RETURN
END
GO

--显示结果
SELECT a.*
FROM tb a,f_Sort(DEFAULT,DEFAULT)