当表更新时从 MySQL 触发器发送电子邮件

Consider a table as table2, i like to add a trigger on this table update as

select Num into num from table1 where ID=new.id;
BEGIN
DECLARE done int default false;
DECLARE cur1 CURSOR FOR select EmailId from users where Num=num;
DECLARE continue handler for not found set done = true;
OPEN cur1;
my_loop: loop
    fetch cur1 into email_id;
    if done then
        leave my_loop;
    end if;
    //send mail to all email id.
end loop my_loop;
close cur1;
END;

评论的地方有什么简单的写法吗?向从表 users 中检索到的所有电子邮件 ID 发送电子邮件.