【SQL开源代码栏目提醒】:网学会员,鉴于大家对SQL开源代码十分关注,论文会员在此为大家搜集整理了“control_structures_cursors.sql”一文,供大家参考学习!
# Procedure to find the orderid with the largest amount
# could be done with max, but just to illustrate stored procedure principles
delimiter //
create procedure largest_order(out largest_id int)
begin
declare this_id int;
declare this_amount float;
declare l_amount float default 0.0;
declare l_id int;
declare done int default 0;
declare continue handler for
sqlstate '02000' set done = 1;
declare c1 cursor for select orderid, amount from orders;
open c1;
repeat
fetch c1 into this_id, this_amount;
if not done then
if this_amount > l_amount then
set l_amount=this_amount;
set l_id=this_id;
end if;
end if;
until done end repeat;
close c1;
set largest_id=l_id;
end
//
delimiter ;