Question

I have a table designed this way

mysql> select * from categories limit 50;
+-------------+-------------+-----------------+------------+------+------+------+------+------+------+------+
| category_id | T1          | T2              | T3         | T4   | T5   | T6   | T7   | T8   | T9   | T10  |
+-------------+-------------+-----------------+------------+------+------+------+------+------+------+------+
|           1 | Popcorn     | Regular Pack    | NULL       | NULL | NULL | NULL | NULL | NULL | NULL | NULL |
|           1 | Popcorn     | Regular Pack    | NULL       | NULL | NULL | NULL | NULL | NULL | NULL | NULL |
|           1 | Popcorn     | Regular Pack    | NULL       | NULL | NULL | NULL | NULL | NULL | NULL | NULL |
|           2 | Popcorn     | Bucket          | NULL       | NULL | NULL | NULL | NULL | NULL | NULL | NULL |
|           2 | Popcorn     | Bucket          | NULL       | NULL | NULL | NULL | NULL | NULL | NULL | NULL |
|           2 | Popcorn     | Bucket          | NULL       | NULL | NULL | NULL | NULL | NULL | NULL | NULL |

|           7 | Soft Drinks | Fountain        | Apple      | NULL | NULL | NULL | NULL | NULL | NULL | NULL |
|           7 | Soft Drinks | Fountain        | Apple      | NULL | NULL | NULL | NULL | NULL | NULL | NULL |
|           8 | Soft Drinks | Fountain        | Orange     | NULL | NULL | NULL | NULL | NULL | NULL | NULL |
|           8 | Soft Drinks | Fountain        | Orange     | NULL | NULL | NULL | NULL | NULL | NULL | NULL |
|           9 | Soft Drinks | Fountain        | Lemon      | NULL | NULL | NULL | NULL | NULL | NULL | NULL |
|           9 | Soft Drinks | Fountain        | Lemon      | NULL | NULL | NULL | NULL | NULL | NULL | NULL |

我需要映射上表的数据。

示例xml文件，仅用于再结构

例如，

在爆米花下我必须有普通包装，水桶

在软饮料下我必须有喷泉，在喷泉下我必须有不同的类别苹果，橙子和柠檬

 <Popcorn>
    <Popcorn items>
     < Regular Pack>
     <Bucket >
    </Popcorn items>
    </Popcorn>

    <Softdrinks>
    <Softdrinks items>
    <Fountain>
<Fountain items>
    <Apple>
    <Orange>
    < Lemon>
</Fountain items>
    </Softdrinks items>

一旦我检索了值，如何设置符合上述要求的条件??

psecoude代码对我来说也足够了

while(rs.next())
{
  String T1 = rs.getString("T1");
  String T2 = rs.getString("T2");
  String T3 = rs.getString("T3");
  String T4 = rs.getString("T4");
  String T5 = rs.getString("T5");
  String T6 = rs.getString("T6");
  String T7 = rs.getString("T7");
  String T8 = rs.getString("T8");
  String T9 = rs.getString("T9");
  String T10 = rs.getString("T10");
}

Answer 1

据我所知

您需要通过此类查询获得两个不同的结果集
1. select DISTINCT T2 from tabelName where T1='PopCorn';和
2. select DISTINCT T2 from tabelName where T1='SoftDrink';

您最好使用PreparedStatement和ps.setString(0,"PopCorn");

对T2和T3应用相同的东西。

现在，您将在第一次查询后获得RegularPack and Bucket，在第二次查询后获得Fountain，然后根据需要使用这些值。

我如何设置符合上述要求的条件

1 个答案: