mysql游標巢狀迴圈例子

create procedure finance_recivedetail(customer_id varchar(20))

begin
declare done int default 0;
declare id_a bigint;
declare pre_recv_remain_a decimal(12,2);
declare storageid_a varchar(20);
declare pre_recv_remain_b decimal(12,2);
declare storageid_b varchar(20);
declare cur1 cursor for select id,pre_recv_remain,storage_id
from `t_fin_pre_recive` where 
pre_recv_customer_id = customer_id
and pre_recv_remain>0  order by create_time asc;
declare cur2 cursor for select abs(pre_recv_remain),storage_id from 
`t_fin_pre_recive` where  pre_recv_remain<0 and pre_recv_customer_id=customer_id;
declare continue handler for not found set done = 1;
-- open cur1;
open cur2;
while done = 0 do -- 要有不然迴圈一次
fetch cur2 into pre_recv_remain_b,storageid_b; -- 退款的
if not done then  -- 要有不然迴圈一次
open cur1; 
while done = 0 do  -- 要有不然迴圈一次
fetch cur1 into id_a, pre_recv_remain_a,storageid_a;
if not done then  -- 要有不然迴圈一次
if (pre_recv_remain_a < pre_recv_remain_b and storageid_b=storageid_a)  then
insert into `t_fin_pre_recive_order` (
pre_recv_id,
order_id,
order_amount,
order_type,
create_time
) values  (id_a,'',pre_recv_remain_a,2,now());
update `t_fin_pre_recive` set pre_recv_remain ='0' where id=id_a;
elseif pre_recv_remain_a = pre_recv_remain_b and storageid_b=storageid_a then 
insert into `t_fin_pre_recive_order`(
pre_recv_id,
order_id,
order_amount,
order_type,
create_time
) values  (id_a,'',pre_recv_remain_a,2,now());
update `t_fin_pre_recive` set pre_recv_remain ='0' where id=id_a;
elseif pre_recv_remain_a > pre_recv_remain_b and storageid_b=storageid_a then
insert into `t_fin_pre_recive_order` (
pre_recv_id,
order_id,
order_amount,
order_type,
create_time
) values  (id_a,'',pre_recv_remain_b,2,now());
update `t_fin_pre_recive` set pre_recv_remain =(pre_recv_remain_a-pre_recv_remain_b) where  id= id_a;
end if;
end if;
end while ;
close cur1;
set done = 0 ; -- 重點設定為0 繼續迴圈不然done=1時直接不迴圈了，外層的也不迴圈了
end if; 
end while;
close cur2;
end

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