22,209
社区成员
发帖
与我相关
我的任务
分享
create table tb(cid int,name varchar(10) , pid int)
insert into tb values(1 , 'A' , 0 )
insert into tb values(2 , 'B' , 0 )
insert into tb values(3 , 'C' , 0 )
insert into tb values(4 , 'A1', 1 )
insert into tb values(5 , 'B1', 2 )
insert into tb values(6 , 'F' , 4 )
insert into tb values(7 , 'G' , 6 )
go
--查询指定节点及其所有子节点的函数
CREATE FUNCTION f_Cid(@CID int) RETURNS @t_Level TABLE(CID int,Level int)
AS
BEGIN
DECLARE @Level int
SET @Level=1
INSERT @t_Level SELECT @CID,@Level
WHILE @@ROWCOUNT>0
BEGIN
SET @Level=@Level+1
INSERT @t_Level SELECT a.CID,@Level
FROM tb a,@t_Level b
WHERE a.PID=b.CID
AND b.Level=@Level-1
END
RETURN
END
GO
--调用函数查询id = 1及其所有子节点
SELECT a.* FROM tb a,f_Cid(1) b WHERE a.CID=b.CID
drop table tb
drop function dbo.f_cid
/*
cid name pid
----------- ---------- -----------
1 A 0
4 A1 1
6 F 4
7 G 6
(所影响的行数为 4 行)
*/
declare @table table
(
cid int,
name nvarchar(20),
pid int
)
insert @table select 1 ,' A ' , 0 union select 4 , 'A1' , 1 union select 3 , 'C', 0
select * from @table where name like '%a%'
--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
--*/