创建触发器 - DECLARE 时出错

i learn triggers from http://forge.mysql.com/wiki/Triggers and i have:

create trigger bi_emps_fer before insert on emps for each row
begin

    declare newsal numeric default 0;
    declare namelength, l_loop int default 0;

    set namelength = length(new.emp_name);

    while l_loop < namelength do

       set newsal := newsal   new.salary;

       set l_loop := l_loop   1;

    end while;

    set new.salary = newsal;

end

和错误:

1064 - 您的 SQL 语法有错误；检查手册对应于您的 MySQL 服务器使用正确语法的版本在第 4 行的 '' 附近

delimiter #

create trigger bi_emps_fer before insert on emps for each row
begin

    declare newsal decimal(10,2) default 0;

    // do sql stuff here but not what you're doing !

    set new.salary = newsal;

end#

delimiter ;