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我有一个如下查询，其中包含已实现的行号

 select   @running:=if(@previous= concat(inouts.days,inouts.element_id,
    inouts.slot_id),@running,0) + 1 as rownum,
    @previous:=concat(inouts.days,inouts.element_id,inouts.slot_id),
    element_value,element_id,date_time,slot_id,days   
    from in_out_element_entry inouts where id_number='1234'
    and element_id>12   
    order by days,element_id,slot_id,date_time

这将返回结果，如附图所示：

rownum | @previous....|element_value|element_id|  date_time         |time_slot  |days  |
-------------------------------------------------------------------------------------
1      |  ...         |  30         |    21    |2013-10-09 14:33:26 |   25      |  0
1      |  ...         |  30         |    21    |2013-10-09 14:33:26 |   25      |  0
2      |  ...         |  30         |    21    |2013-10-09 14:33:40 |   25      |  0
1      |  ...         |  130        |    22    |2013-10-09 14:33:26 |   25      |  0
2      |  ...         |  130        |    22    |2013-10-09 14:33:40 |   25      |  0
1      |  ...         |  900        |    23    |2013-10-09 14:33:26 |   26      |  0
2      |  ...         |  900        |    23    |2013-10-09 14:33:40 |   26      |  0

但是当我尝试使用 JDBC 运行此查询时，所有行号都是 1 。

我什至尝试通过存储过程执行相同的查询。并从 Java Dao 类中调用 SP。但最终结果会发生变化。所有的 rownumber 列都变为 1。

我不知道该怎么做或为什么会发生。有人可以帮忙吗？

我创建一个这样的存储过程：

    create or replace procedure sp_in_out_report(
IN p_id_number VARCHAR(45))
begin
start transaction ;
insert into r_in_out(id_number,days,total_in)  
 select p_ip_number,days,sum(element_value) as total_in from
 (select   @running:=if(@previous= concat(inouts.days,inouts.element_id,
        inouts.slot_id),@running,0) + 1 as rownum,
        @previous:=concat(inouts.days,inouts.element_id,inouts.slot_id),
        element_value,element_id,date_time,slot_id,days   
        from in_out_element_entry inouts where id_number=p_id_number
        and element_id>12   
        order by days,element_id,slot_id,date_time )where rownum=1 group by days
commit;
end

然后从 Java 调用，如图所示：

CallableStatement callableStatement = null;

String procedureCall = "{call sp_ins_out_summary_report(?)}";

callableStatement = connection.prepareCall(procedureCall);
callableStatement.setString("p_id_number", idNum);
callableStatement.executeUpdate();

基本上我需要行号才能根据 date_time 从每个插槽中获取任何 element_id 的最新值

谢谢

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