该如何写存储过程,实现mysql返回多个结果,其中的结果可能为空

就跟写Java代码里有返回值的方法一样，只是把语法换成Sql里面的写法就好了

aaa: 输入参数

bbb: 输出参数,一个表对象，或者一个结果集

包

produce getMySqlDate(aaa IN varchar2，

bbb OUT tmpTable%ROWTYPE) IS

本体

produce getMySqlDate(aaa IN varchar2，

bbb OUT tmpTable%ROWTYPE)

begin

--查询数据

CURSOR curCc is

select a,b from tab1

type typeCurCc of table curCc%ROWTYPE

typeCurCc tabCurCc-- 定义游标类型

--打开游标把查询处理的数据，赋值到bbb的输出参数就行了。

open 游标

....

bbb.a = 游标.a

close 游标

--存储过程终了

END getMysql；

select sum(money) as money, id

from recharge

where time between xxx and xxx

group by id

余额可以单独用一个余额记录表，这样如果要查询每次消费记录的时候，也能查出来每次消费后还有多少余额。余额记录表里面主要是三个字段：用户账号、每次消费后的余额、时间点。

CREATE TABLE account

(

id integer NOT NULL DEFAULT nextval('trade_id_seq'::regclass),

no character varying(10) NOT NULL, -- 账号

balance money NOT NULL DEFAULT 0.00, -- 余额

datetime timestamp without time zone NOT NULL DEFAULT (now())::timestamp(0) without time zone,

CONSTRAINT account_pkey PRIMARY KEY (id)

)

通过每次的余额变化就知道每次消费后的余额情况

select acc.*, (select sum(balance)+acc.balance from account as ac where ac.id <acc.id) as profit from account as acc

id | no | balance | datetime | profit

----+------+----------+---------------------+---------

1 | 1000 |$0.00 | 2013-10-09 10:51:10 |

2 | 1000 | $12.60 | 2013-10-09 10:51:22 | $12.60

4 | 1000 | $16.80 | 2013-10-09 10:51:42 | $29.40

5 | 1000 | $100.00 | 2013-10-09 10:51:49 | $129.40

6 | 1000 | $200.00 | 2013-10-09 10:56:35 | $329.40

7 | 1000 | $50.45 | 2013-10-09 10:57:23 | $379.85

8 | 1000 | $75.50 | 2013-10-09 10:57:31 | $455.35

9 | 1000 | -$55.30 | 2013-10-09 10:59:28 | $400.05

10 | 1000 | -$200.00 | 2013-10-09 10:59:44 | $200.05

(9 rows)

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