写了一个存储过程，代码如下，作用是将模块表和用户表中的模块id和用户id都查询出来，然后逐一匹配写入user_module表中，但是执行结果确实，只写入了一个用户的数据，其他的用户都没有，这是什么情况呢？

create procedure in_do() 
begin 
    declare moid,puid int; 
    declare do1,do2 int default false; 
    declare attr_1 cursor for select id from user_public; 
    declare attr_2 cursor for select id from public_module where status='1' and (pid!=0 or special='1'); 
    declare continue handler for not found set do1=true; 
    open attr_1; 
    read_loop:loop 
        fetch attr_1 into puid; 
        if do1 then 
            leave read_loop; 
        end if; 
        begin 
            declare continue handler for not found set do2=true; 
            open attr_2; 
            read_loop1:loop 
                fetch attr_2 into moid; 
                if do2 then 
                    leave read_loop1; 
                end if; 
                insert into user_module(public_id,module_id,stime,etime) values(puid,moid,'1483203661','1514739661'); 
            end loop; 
            close attr_2; 
        end; 
    end loop; 
    close attr_1; 
end //