--数据结构
表名tb,如果修改表名,则相应修改所有数据处理中涉及到的表名tb
id为编号(标识字段+主键)
pid为上级编号
name为名称,后面可以自行增加其他字段.
/*-- 得到指定id的子id列表 --*/
--不包含排序字段的情况
create function f_getchildid(@id int)
returns @re table(id int)
as
begin
insert into @re select id from tb where pid=@id
while @@rowcount>0
insert into @re select a.id
from tb a inner join @re b on a.pid=b.id
where a.id not in(select id from @re)
return
end
go
--包含排序字段的情况
create function f_getchildidsort(@id int)
returns @re table(id int,sortid varchar(8000))
as
begin
--为了数字排序正常,需要统一编码宽度
declare @idlen int,@idheader varchar(20)
select @idlen=max(len(id))
,@idheader=space(@idlen)
from tb
insert into @re select id,right(@idheader+cast(id as varchar),@idlen)
from tb where pid=@id
while @@rowcount>0
insert into @re select a.id,right(@idheader+cast(a.id as varchar),@idlen)+','+b.sortid
from tb a inner join @re b on a.pid=b.id
where a.id not in(select id from @re)
return
end
go
--调用示例,显示1的所有子.
select a.* from tb a inner join dbo.f_getchildidsort(1) b on a.id=b.id order by b.sortid