J2EE项目中用使用Date类型不显示时分秒的解决方法

在开发web项目中，发现提取Oracle中某几个Date类型的字段时，发现提出来的Date型值，只有“年月日”，没有“时分秒”显示出来，实际业务中，是要求页面上显示的日期要求是有“年月日是分秒”的。这里说明一下，我是用session.createSQLQuery(sql).list()来返回值的，反回的值类型是List(Object[]).虽然，我是用的ssh,由于此处的sql对应的业务情况涉及到复杂的多表查询，如果是用hibernate来作映射的话，难度就非常大了，而且编码会带来很大的难度。。所以这里就委而用原生态的sql或者说标准sql来返回值了。

具体详细问题如下

在用ssh中
对于如下语句
session.createSQLQuery(sql).list();
查询，返回一个List<Object[]>
在对List循环中
我发现 如 显示日期类型的值时，只显示了“年月日”，没有显示“时分秒”
for(Object[] obj:session.createSQLQuery(sql).list())
{
    ...
    System.out.println("收单日期是 "+(Date)obj[5]);
    //只显示了年月日，没有显示"时分秒"了 如2010-03-01
    //oracle数据表中对应字段的值，实际上是03-01-2010 16:31:14
    ...
}

折腾了半天后，经网友提醒，和本人的耐心测试，终于找到了解决方法
方法一
将Oracel数据库对应表中“收单时间的字段”receive_sheet_time,由原来的Date类型改为timestamp
然后，在java程序中，由 (java.util.timestamp)obj[5] 这样返回值，就会显示有“年月月时分秒“了。

如 2010-03-01 14:39:17

方法二
OracleOracel数据库对应表中“收单时间的字段”receive_sheet_time，字段继续保持Date类型不变
将上述sql语句中，返回 “收单日期的字段”receive_sheet_time ，变为
to_char(loading.receive_sheet_time,'YYYY-MM-DD hh24:mi:ss') as receive_sheet_time
作为字符串类型来返回值，
然后在java程序中用，由 (String)obj[5] 这样返回值，就会显示有“年月月时分秒“了。

如 2010-03-01 14:39:17

 

附：至于Date和timestamp类型的区别，我就不多说，朋友们可以到网上一搜就知道了

 

原来的sql
SELECT load_point,
       dispatch_no,
       schedule_no,
       truck_no,
       trans_date,
       trans_company_name,
       departure_time,
       trans_company_code,
       receive_sheet_time,
       dispatch_sheet_time,
       loading_time,
       SUM(expected_qty) AS expected_qty,
       SUM(allocate_qty) AS allocate_qty,
       SUM(real_qty) AS real_qty
  FROM (SELECT odetail.load_point,
               dispatch.dispatch_no,
               odetail.Schedule_No,
               dispatch.trans_company_code,
               dispatch.truck_no,
               TO_CHAR(dispatch.trans_date, 'YYYY-MM-DD') AS trans_date,
               dispatch.trans_company_name,
               odetail.expected_qty,
               odetail.allocate_qty,
               odetail.real_qty,
               loading.receive_sheet_time,
               loading.dispatch_sheet_time,
               loading.loading_time,
               loading.departure_time
          FROM t_dispatch         dispatch,
               t_order_detail     odetail,
               t_dispatch_detail  tdetail,
               t_dispatch_loading loading
         WHERE dispatch.dispatch_no = tdetail.dispatch_no
           AND odetail.order_no = tdetail.order_no
           AND odetail.order_line_no = tdetail.order_line_no
           AND loading.dispatch_no = dispatch.dispatch_no
           AND loading.load_point = odetail.load_point
           AND dispatch.status <> 99
           AND NVL(dispatch.b_cancel, 0) = 0)
 WHERE 1 = 1
   AND TO_CHAR(departure_time, 'YYYY-MM-DD HH24:MI:SS') >=
       '2010-04-07 00:00:07'
   AND TO_CHAR(departure_time, 'YYYY-MM-DD HH24:MI:SS') <=
       '2010-04-07 23:59:07'
 GROUP BY load_point,
          dispatch_no,
          schedule_no,
          truck_no,
          trans_date,
          trans_company_name,
          departure_time,
          trans_company_code,
          receive_sheet_time,
          dispatch_sheet_time,
          loading_time
 ORDER BY dispatch_no, schedule_no, load_point

 

 

新sql语句
(下述sql语句红色部分，就是我将返回的日期类型，转换为to_char类型返回了。。用方法一时，用原来的sql就行了)

SELECT load_point,
       dispatch_no,
       schedule_no,
       truck_no,
       trans_date,
       trans_company_name,
       departure_time,
       trans_company_code,
       receive_sheet_time,
       dispatch_sheet_time,
       loading_time,
       SUM(expected_qty) AS expected_qty,
       SUM(allocate_qty) AS allocate_qty,
       SUM(real_qty) AS real_qty
  FROM (SELECT odetail.load_point,
               dispatch.dispatch_no,
               odetail.Schedule_No,
               dispatch.trans_company_code,
               dispatch.truck_no,
               TO_CHAR(dispatch.trans_date, 'YYYY-MM-DD') AS trans_date,
               dispatch.trans_company_name,
               odetail.expected_qty,
               odetail.allocate_qty,
               odetail.real_qty,
               to_char(loading.receive_sheet_time,'YYYY-MM-DD hh24:mi:ss') as receive_sheet_time,
               to_char(loading.dispatch_sheet_time,'YYYY-MM-DD hh24:mi:ss') as dispatch_sheet_time,
               to_char(loading.loading_time,'YYYY-MM-DD hh24:mi:ss') as loading_time,
               to_char(loading.departure_time,'YYYY-MM-DD hh24:mi:ss') as departure_time
          FROM @DBUSer.t_dispatch         dispatch,
               @DBUSer.t_order_detail     odetail,
               @DBUSer.t_dispatch_detail  tdetail,
               @DBUSer.t_dispatch_loading loading
         WHERE dispatch.dispatch_no = tdetail.dispatch_no
           AND odetail.order_no = tdetail.order_no
           AND odetail.order_line_no = tdetail.order_line_no
           AND loading.dispatch_no = dispatch.dispatch_no
           AND loading.load_point = odetail.load_point
           AND dispatch.status <> 99
           AND NVL(dispatch.b_cancel, 0) = 0)
 WHERE 1 = 1 
    @var1            
 GROUP BY load_point,
          dispatch_no,
          schedule_no,
          truck_no,
          trans_date,
          trans_company_name,
          departure_time,
          trans_company_code,
          receive_sheet_time,
          dispatch_sheet_time,
          loading_time
 ORDER BY dispatch_no, schedule_no, load_point