很多人可能想要查询整个树形表关联的内容都会通过循环递归来查...事实上在微软在sql2005或以上版本就能用别的语法进行查询，下面是示例。
sql;">
--通过子节点查询父节点
WITH
TREE AS(
SELECT * FROM Areas
WHERE id = 6 -- 要查询的子 id
UNION ALL
SELECT Areas.* FROM Areas,TREE
WHERE TREE.PId = Areas.Id
)
SELECT Area FROM TREE
--通过父节点查询子节点
WITH
TREE AS(
SELECT * FROM Areas
WHERE id = 7 -- 要查询的子 id
UNION ALL
SELECT Areas.* FROM Areas,TREE
WHERE TREE.Id = Areas.PId
)
SELECT Area FROM TREE
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sql;">
--通过子节点查询父节点
declare @area varchar(8000);
WITH
TREE AS(
SELECT * FROM Areas
WHERE id = 6 -- 要查询的子 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
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则结果为：中国北京市丰台区
根据以上可以将这段代码封装为一个存储过程
sql;">
-----存储过程，递归获取树形地区表字符串
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 -- 要查询的子 id
UNION ALL
SELECT Areas.* FROM Areas,'')+Area from Tree order by id
select Area= @area
end
go
--exec sp_helptext 'SP_GetAreaStr'
--go
exec SP_GetAreaStr 28
go
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查询结果：中国安徽省宿州市灵璧县
所用表结构：
部分数据：
以上所述是小编给大家介绍的sql Server 树形表非循环递归查询的实例详解的相关知识，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！
