標籤：
很多人可能想要查詢整個樹形表關聯的內容都會通過迴圈遞迴來查...事實上在微軟在SQL2005或以上版本就能用別的文法進行查詢，下面是樣本。 --通過子節點查詢父節點
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 --通過父節點查詢子節點
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 通過子節點查詢父節點查詢結果為：修改代碼為 --通過子節點查詢父節點
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
則結果為：中國北京市丰台區 根據以上可以將這段代碼封裝為一個預存程序 -----預存程序，遞迴擷取樹形地區表字串
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 查詢結果：中國安徽省宿州市靈璧縣 所用表結構：部分資料：
SQL Server 樹形表非迴圈遞迴查詢
