昏倒，看不出问题的问题

[cenwenchuok]

下面这段代码中两次打印应该打印出一样的结果，可是前一个13，后一个0，大家帮忙看看问题出在哪里呀？

declare
TYPE t_channelInfo is Record
(
channelid channel.channelid%TYPE
);

TYPE Table_cursorRef IS REF CURSOR return t_channelInfo;

type t_childnum is table of channel.channelid%Type index by binary_integer;
type t_childinfo is table of t_childnum index by binary_integer;
type t_totalinfo is table of t_channelInfo index by binary_integer;

p_vchildinfo t_childinfo;
p_nchildnum t_childnum;
p_totalinfo t_totalinfo;
p_cursor Table_cursorRef;
aa number;

begin
select count(channelid) into aa from channel where channel.fatherchannelid = 0;
Dbms_Output.Put_Line(to_char(aa));

open p_cursor for
select channelid from channel where channel.fatherchannelid = 0;

Dbms_Output.Put_Line(to_char(p_cursor%rowcount));

close p_cursor;

end;