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【MSSQL】实现递归算法

作者:dezai / 发布于2013/12/31/ 888

根据传入参数查找指定项的子项的递归用法

样表：
child,parent
1 0
2 0
3 1
4 2



procedure 方式：

create procedure usp_getallchild(@child int)
as
declare @t table(child int null,parent int null,level int null)
declare @level int
set @level=0
insert into @t(t.child,t.parent,level) select [table].child,[table].parent,@level from [table] where [table].child=@child
while @@rowcount>0
begin
set @level=@level+1
insert into @t(t.child,t.parent,level) select [table].child,[table].parent,@level from [table] join @t as t on t.child=[table].parent where t.level=@level-1

end
select * from @t





procedure 方式：

create function udf_getallchild(@child int)
returns @t_return table(child int null,parent int null,level int null)
as
begin

declare @level int
set @level=0
insert into @t_return(child,parent,level) select child,parent,@level from table where child=@child
while @@rowcount>0
begin
 set @level=@level+1
 insert into @t(child,parent,level) select child,parent,@level from table jion @t_return as t on t.child=table.parent where t.level=@level-1

end
    return @t_return
end

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