--------------------------------------------------------------------------------
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--生成测试数据
create table Dept(ID int,ParentID int,msg varchar(20))
insert into Dept select 1,0,null
insert into Dept select 2,1,null
insert into Dept select 3,1,null
insert into Dept select 4,2,null
insert into Dept select 5,3,null
insert into Dept select 6,5,null
insert into Dept select 7,6,null
go
--创建用户定义函数
Create function [dbo].[GetChild](@ID varchar(10))
returns @t table(ID varchar(10),ParentID varchar(10),Level int)
as
begin
declare @i int
set @i = 1
insert into @t select @ID,@ID,0 --当前级，本级，如果不要的话可以注释掉或再加个参数来选择操作
insert into @t select ID,ParentID,@i from Dept where ParentID = @ID
while @@rowcount<>0
begin
set @i = @i + 1
insert into @t
select
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