mysql sp

drop procedure if exists p_update_platform;

delimiter $$

create procedure p_update_platform(in p_platform_id int,in p_platform_name varchar(50),in p_shop_id int,out p_num int)

begin

set p_num=1;

WHILE

exists(select 1 from sale_order where shop_id=p_shop_id and platform_id is null)

and p_num<=10

do

update sale_order set platform_id=p_platform_id,platform_name=p_platform_name where shop_id=p_shop_id and platform_id is null limit 1;

set p_num=p_num+1;

end while ;

end ;

$$

delimiter ;

set @platform_id=1010,@platform_name='天猫',@shop_id=35;

call p_update_platform(1010,'天猫', 35,@p_num);

select @p_num;