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。
--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
通过子节点查询父节点查询结果为：
修改代码为
--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
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
-----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, 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！