使用MySQL儲存過程實現唯一單號的自增生成

建議先學習mysql的儲存過程

sql語句為

-- ----------------------------

-- table structure for orders
-- ----------------------------
drop table if exists `orders`;
create table `orders` (
`id` int(50) not null auto_increment,
`order_no` int(50) null default null,
`station` varchar(255) character set utf8 collate utf8_general_ci null default null comment '站點名',
primary key (`id`) using btree
) engine = innodb auto_increment = 2 character set = utf8 collate = utf8_general_ci row_format = compact;
-- ----------------------------
-- records of orders
-- ----------------------------
insert into `orders` values (1, 903000001, '903');

create definer=`root`@`localhost` procedure `generate_orderno`(in ordernamepre char(3),out neworderno varchar(9))

begin 
declare maxno int default 0 ; -- 定義該站點中當前訂單號最大的號 後六位
declare oldorderno varchar (9) default '' ; -- 定義該站點中的最近的乙個物流單號
select ifnull(order_no, '') into oldorderno -- 取去當前站點的最近的訂單號
from orders 
where substring(order_no, 1, 3) = ordernamepre
order by id desc limit 1 ; 
if oldorderno != '' then 
set maxno = convert(substring(oldorderno,4), decimal) ; -- 如果當前站點有訂單號 則該站點最大號為最近的物流單號的後六位 強轉為數字
end if ; 
select concat(ordernamepre, lpad((maxno + 1), 6, '0')) into neworderno ; -- 將站點名902 與生成的物流單號拼接一起 並返回物流單號 其中lpad是左拼接方法 將0拼在物流單號的左邊 拼成6位數
if oldorderno = '' then 
insert into orders (order_no, station) values (neworderno, ordernamepre) ; -- 如果當前站點不存在 則插入一條站點記錄
end if ; 
update orders set order_no = neworderno where substring(order_no, 1, 3) = ordernamepre; -- 更新當前站點名下的物流單號
}

public void test() ";// 呼叫的sql 

callablestatement cs = con.preparecall(storedproc); 
cs.setstring(1, "p1");// 設定輸入引數的值 
cs.registeroutparameter(2,oracletypes.varchar);// 註冊輸出引數的型別 
return cs; 
} }, new callablestatementcallback() 
}); 
}

public void test() ";// 呼叫的sql 

callablestatement cs = con.preparecall(storedproc); 
cs.setstring(1, "p1");// 設定輸入引數的值 
cs.registeroutparameter(2, oracletypes.cursor);// 註冊輸出引數的型別 
return cs; 
} }, new callablestatementcallback() 
rs.close(); 
return resultsmap; 
} }); 
for (int i = 0; i < resultlist.size(); i++) 
}

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