Mysql基础第二十六天,使用存储过程

delimiter // //修改定界符
create  procedure ordertotal(in onnumber int,out ototal decimal(10,2))
begin
select sum(item_price * quantity) from orderitems where order_num=onnumber into ototal;
end//

delimiter ; //修改定界符
call ordertotal(2005,@total)
end//
select @taltal; // 调用存储过程 @taltal(变量)

delimiter //
create procedure ordertotal(in onnumber int,in taxable boolean,out ototal decimal(10,2))
begin 
declare total decimal(10,2);
declare taxrate int default 6;
select sum(item_price * quantity) from orderitems where order_num = onumber into total;
if taxable then
select total * (1+taxrate/100) into total;
end if;
select total into ototal;
end //
call ordertotal(2005,0,@ototal)//
select @ototal//
show create procedure ordertotal//  查看创建语句

drop procedure ordertotal//