我在将游标中的值提取到变量中时遇到问题：
create or replace
procedure projectinfo(num clubs.clubid%type)
as
--identify variables
p_cln clubs.clubname%type;
p_projn projects.projectname%type;
p_projnum number;
p_taskn tasks.taskname%type;
p_tasknum number;
cursor cur is
select c.clubname, p.projectname, t.taskname
from clubs c join projects p on c.clubid=p.clubid
join tasks t on t.projectid=p.projectid
where c.clubid=num;
--I have checked the above cursor and it's worked fine!!!
begin
p_projnum:=0;
p_tasknum:=0;
open cur;
loop
fetch cur into p_cln,p_projn, p_taskn;
dbms_output.put_line(p_cln|| ' ' ||p_projn|| ' ' || p_taskn);
-- the above command does not print variable values!!!
exit when cur%notfound;
p_projnum:=p_projnum+1;
dbms_output.put_line(' ************************ ');
dbms_output.put_line(' club name : ' ||p_cln);
dbms_output.put_line( ' project ' ||p_projnum|| ' ' || p_projn);
loop
p_tasknum:=p_tasknum+1;
dbms_output.put_line('Task: ' ||p_tasknum|| ' ' || p_taskn);
fetch cur into p_cln,p_projn, p_taskn;
exit when cur%notfound;
end loop;
end loop;
close cur;
end projectinfo;
我检查了我的光标，它确实包含我需要的所有值。我的程序编译 FINE 但不打印任何输出！！！