在存储过程中声明局部游标以循环调用自身

declare cs Cursor local for xxx 

alter procedure [dbo].[pGetBoms]
@MaterialCode nvarchar(50) ----物料代码
as
begin    
    insert into MESBOMs 
        select cInvCodeParent,cInvCode,nQty,bParent From MesBOM where cInvCodeParent=@MaterialCode
    declare cs Cursor local for select * From MESBOMs where cInvCodeParent=@MaterialCode
    declare @cInvCodeParent nvarchar(50)
    declare @cInvCode nvarchar(50)
    declare @nQty decimal
    declare @bParent bit
    open cs
    fetch next from cs into @cInvCodeParent,@cInvCode,@nQty,@bParent
    while(@@FETCH_STATUS=0)
    begin
        if(@bParent=1)
                exec pGetBoms @MaterialCode=@cInvCode
        fetch next from cs into @cInvCodeParent,@cInvCode,@nQty,@bParent
    end
    close cs
    deallocate cs
end