树形结构的数据库实现，存储过程实现添加删除查询功能

USE [JPKCDB]

GO

/****** Object: StoredProcedure [dbo].[BbsDelete] Script Date: 2015/11/19 23:32:09 ******/

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

ALTER PROCEDURE [dbo].[BbsDelete]

(

@ID INT

)

AS

DECLARE @LID AS INT, @RID AS INT, @WID AS INT, @DID AS INT, @NUM as int

set @NUM=0

SET @DID = 0

SELECT @DID = ID, @LID = LID, @RID = RID, @WID = RID - LID + 1 FROM Bbs WHERE ID = @ID

IF @DID != 0

BEGIN

select @NUM=@WID/2

DELETE FROM Bbs WHERE LID BETWEEN @LID AND @RID

UPDATE Bbs SET RID = RID - @WID WHERE RID > @RID

UPDATE Bbs SET LID = LID - @WID WHERE LID > @RID

update Bbs set ID=ID-@NUM where ID>@ID

update Bbs set FID=FID-@NUM where FID>@ID

END

SELECT @DID

USE [JPKCDB]

GO

/****** Object: StoredProcedure [dbo].[BbsInsert] Script Date: 2015/11/19 23:32:39 ******/

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

ALTER PROCEDURE [dbo].[BbsInsert]

(

@Root INT,

@tieName nvarchar(100),

@bbsTitle nvarchar(50),

@detail nvarchar(2000),

@pubTime nchar(19),

@publisherId INT,

@tp INT,

@did INT,

@state INT

)

AS

DECLARE @LID AS INT,@RID AS INT,@NID AS INT,@Tree AS INT,@NkID AS INT,@CNT AS INT

SET @LID=0

SET @RID = 1

SET @NID = 0

SET @Tree = 0

SET @CNT=0

-- 表中为空，没有树根节点，则先插入树根节点

set @nkid=(select count(*)+1 from Bbs)

IF (@nkid=1)

BEGIN

INSERT INTO Bbs(id,LID,RID,Tree,fid,tieName,bbsTitle,detail,pubTime,publisherId,tp,did,state) VALUES (0,1,2,0,-1,@tieName,@bbsTitle,@detail,@pubTime,@publisherId,@tp,@did,@state)

END

ELSE

BEGIN

--在根节点下插入

SELECT @LID=LID,@RID = RID, @Tree = Tree + 1

FROM Bbs WHERE ID = @Root

SET @NID=@ROOT+(@RID-@LID+1)/2

UPDATE Bbs SET RID = RID + 2 WHERE RID >= @RID

UPDATE Bbs SET LID = LID + 2 WHERE LID > @RID

UPDATE Bbs SET ID = ID + 1 WHERE LID > @RID

UPDATE Bbs SET fID = fID + 1 WHERE fid> @root AND RID>@RID

INSERT INTO Bbs(id,LID,RID,Tree,fid,tieName,bbsTitle,detail,pubTime,publisherId,tp,did,state) VALUES (@NID,@RID,@RID + 1,@Tree,@root,@tieName,@bbsTitle,@detail,@pubTime,@publisherId,@tp,@did,@state)

SET @NkID = SCOPE_IDENTITY()

SELECT @NkID

END

USE [JPKCDB]

GO

/****** Object: StoredProcedure [dbo].[BbsSelect] Script Date: 2015/11/19 23:32:51 ******/

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

ALTER PROCEDURE [dbo].[BbsSelect]

-- Add the parameters for the stored procedure here

@Root INT,

@Tree INT

AS

BEGIN

SELECT *

FROM Bbs AS Z,Bbs AS P

WHERE P.ID=@Root

AND Z.LID>=P.LID AND Z.RID <=P.RID

AND (@Tree = 0 OR Z.Tree<=P.Tree+@Tree)

ORDER BY Z.LID ASC

END