--LZ不提供数据,我们怎么做? --给你邹建书上的例子! --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--查询指定节点及其所有子节点的函数 CREATE FUNCTION f_Cid(@ID char(3)) RETURNS @t_Level TABLE(ID char(3),Level int) AS BEGIN DECLARE @Level int SET @Level=1 INSERT @t_Level SELECT @ID,@Level WHILE @@ROWCOUNT>0 BEGIN SET @Level=@Level+1 INSERT @t_Level SELECT a.ID,@Level FROM tb a,@t_Level b WHERE a.PID=b.ID AND b.Level=@Level-1 END RETURN END GO--调用函数查询002及其所有子节点 SELECT a.* FROM tb a,f_Cid('002') b WHERE a.ID=b.ID /*--结果 ID PID Name ------ ------- ---------- 002 001 烟台市 004 002 招远市 --*/
--例如:CREATE FUNCTION f_Cid(@ID Int) RETURNS @t_Level TABLE(ID Int,Level int) AS BEGIN DECLARE @Level int SET @Level=1 INSERT @t_Level SELECT @ID,@Level WHILE @@ROWCOUNT>0 BEGIN SET @Level=@Level+1 INSERT @t_Level SELECT a.ID,@Level FROM 表 a,@t_Level b WHERE a.PID=b.ID AND b.Level=@Level-1 END RETURN END GO
--比如查询节点8下的所有子結點 SELECT a.* FROM 表 as a,f_Cid(8) as b WHERE a.ID=b.ID
兄弟,对上面两位的补充一下(冒犯了)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 '001','004','山东省' CREATE FUNCTION f_Cid(@ID char(3)) RETURNS @t_Level TABLE(ID char(3),Level int) AS BEGIN DECLARE @Level int declare @cnt int SET @Level=1 INSERT @t_Level SELECT @ID,@Level WHILE @@ROWCOUNT>0 BEGIN
SET @Level=@Level+1 INSERT @t_Level SELECT a.ID,@Level FROM tb a,@t_Level b WHERE a.PID=b.ID AND b.Level=@Level-1 select @cnt=count(*) from @t_Level a left join @t_Level b on a.ID=b.ID and a.Level<>b.level if @cnt>0 --互锁检查 begin INSERT @t_Level(id) SELECT 'ERR' break end END RETURN END select * from f_Cid('002')
--给你邹建书上的例子!
--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--查询指定节点及其所有子节点的函数
CREATE FUNCTION f_Cid(@ID char(3))
RETURNS @t_Level TABLE(ID char(3),Level int)
AS
BEGIN
DECLARE @Level int
SET @Level=1
INSERT @t_Level SELECT @ID,@Level
WHILE @@ROWCOUNT>0
BEGIN
SET @Level=@Level+1
INSERT @t_Level SELECT a.ID,@Level
FROM tb a,@t_Level b
WHERE a.PID=b.ID
AND b.Level=@Level-1
END
RETURN
END
GO--调用函数查询002及其所有子节点
SELECT a.*
FROM tb a,f_Cid('002') b
WHERE a.ID=b.ID
/*--结果
ID PID Name
------ ------- ----------
002 001 烟台市
004 002 招远市
--*/
RETURNS @t_Level TABLE(ID Int,Level int)
AS
BEGIN
DECLARE @Level int
SET @Level=1
INSERT @t_Level SELECT @ID,@Level WHILE @@ROWCOUNT>0
BEGIN
SET @Level=@Level+1
INSERT @t_Level SELECT a.ID,@Level
FROM 表 a,@t_Level b
WHERE a.PID=b.ID AND b.Level=@Level-1
END
RETURN
END
GO
--比如查询节点8下的所有子結點
SELECT a.*
FROM 表 as a,f_Cid(8) as b
WHERE a.ID=b.ID
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 '001','004','山东省'
CREATE FUNCTION f_Cid(@ID char(3))
RETURNS @t_Level TABLE(ID char(3),Level int)
AS
BEGIN
DECLARE @Level int
declare @cnt int
SET @Level=1
INSERT @t_Level SELECT @ID,@Level
WHILE @@ROWCOUNT>0
BEGIN
SET @Level=@Level+1
INSERT @t_Level SELECT a.ID,@Level
FROM tb a,@t_Level b
WHERE a.PID=b.ID
AND b.Level=@Level-1 select @cnt=count(*) from @t_Level a
left join @t_Level b on a.ID=b.ID and a.Level<>b.level
if @cnt>0 --互锁检查
begin
INSERT @t_Level(id) SELECT 'ERR'
break
end
END
RETURN
END
select * from f_Cid('002')