sql 生成菜单列表形菜单（作为笔记记录在这里）

l给你一个例子，跟这个差不多：

CREATE TABLE T(ID INT ,PID INT)

INSERT INTO T SELECT 1,0

UNION ALL SELECT 2,0

UNION ALL SELECT 3,1

UNION ALL SELECT 4,1

UNION ALL SELECT 5,2

UNION ALL SELECT 6,4

UNION ALL SELECT 7,3

UNION ALL SELECT 8,4

GO

--测试数据

CREATE FUNCTION F(@ID INT)

RETURNS VARCHAR(20)

AS

BEGIN

DECLARE @R VARCHAR(20)

SET @R=@ID

WHILE ISNULL(@ID,'')<>''

BEGIN

SELECT @R=CAST(PID AS VARCHAR(20))+'.'+@R FROM T WHERE
ID=@ID

SELECT @ID=PID FROM T WHERE ID=@ID

END

RETURN @R

END

GO

--生成目录

CREATE FUNCTION F2(@F VARCHAR(20))

RETURNS VARCHAR(20)

BEGIN

DECLARE @R VARCHAR(20)

SET @R=''

SET @F=SUBSTRING(@F,4,LEN(@F))

WHILE CHARINDEX('.',@F,1)<>0

BEGIN

SET @F=SUBSTRING(@F,CHARINDEX('.',@F,1)+1,LEN(@F))

SET @R='-'+@R

END

RETURN @R

END

GO

--生成前缀符号

SELECT DBO.F2(DBO.F(ID))+CAST(ID AS VARCHAR) FROM T ORDER BY DBO.F(ID)

GO

--结果

DROP TABLE T

DROP FUNCTION F

DROP FUNCTION F2

----------------------------------------------------以下为结果集--------------------------------------------------------------

1

-3

--7

-4

--6

--8

2

-5