菜鸟求救，想往mysql的date_sub函数中放入参数，可是一直报错
create procedure dowhile()
begin
declare v1 int default 1;
declare v2 = v1 + 1;
while v1 < 6 do
select date_sub(current_date, interval v2 day);
set v1 = v1 + 1;
end while;
end

call dowhile();

[解决办法]