SQL Server 樹形表非輪回遞歸查詢的實例詳解

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許多人能夠想要查詢全部樹形表聯系關系的內容都邑經由過程輪回遞歸來查...現實上在微軟在SQL2005或以上版本就可以用其余語法停止查詢，上面是示例。

--經由過程子節點查詢父節點
WITH 
TREE AS( 
SELECT * FROM Areas 
WHERE id = 6 -- 要查詢的子 id 
UNION ALL 
SELECT Areas.* FROM Areas, TREE 
WHERE TREE.PId = Areas.Id
) 
SELECT Area FROM TREE
--經由過程父節點查詢子節點
WITH 
TREE AS( 
SELECT * FROM Areas 
WHERE id = 7 -- 要查詢的子 id 
UNION ALL 
SELECT Areas.* FROM Areas, TREE 
WHERE TREE.Id = Areas.PId
) 
SELECT Area FROM TREE

經由過程子節點查詢父節點查詢成果為：

修正代碼為

--經由過程子節點查詢父節點
declare @area varchar(8000);
WITH 
TREE AS( 
SELECT * FROM Areas 
WHERE id = 6 -- 要查詢的子 id 
UNION ALL 
SELECT Areas.* FROM Areas, TREE 
WHERE TREE.PId = Areas.Id
)
select @area=isnull(@area,'')+Area from Tree order by id 
select Area= @area

則成果為：中國北京市豐台區

依據以上可以將這段代碼封裝為一個存儲進程

-----存儲進程，遞歸獲得樹形地域表字符串
if exists (select * from sysobjects where name='SP_GetAreaStr')
drop proc SP_GetAreaStr
go
create procedure SP_GetAreaStr 
@id int
as
declare @area varchar(8000)
begin
WITH 
TREE AS( 
SELECT * FROM Areas 
WHERE id = @id -- 要查詢的子 id 
UNION ALL 
SELECT Areas.* FROM Areas, TREE 
WHERE TREE.PId = Areas.Id
)
select @area=isnull(@area,'')+Area from Tree order by id 
select Area= @area
end 
go
--exec sp_helptext 'SP_GetAreaStr'
--go
exec SP_GetAreaStr 28
go

查詢成果：中國安徽省宿州市靈璧縣

所用表構造：

部門數據：

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