MyBatis：基于列值的列表映射

Question

是否有办法根据结果集中某列的值在Mybatis中创建List of Map。

下面解释我的方案是结果集。

这是Oracle分层查询的结果集：

    SELECT * FROM (
    SELECT * 
    FROM   MA0101.MESSAGE_NOTIFICATION 
    START WITH ORIGINAL_MESSAGE_SEQ_NO IS NULL 
    CONNECT BY PRIOR MESSAGE_SEQUENCE_NO = ORIGINAL_MESSAGE_SEQ_NO
    ORDER SIBLINGS BY LAST_UPDATED_DT DESC)
WHERE (SENDER_NYL_ID = 'T57HI9H' OR RECEIVER_NYL_ID = 'T57HI9H')
      AND FISCAL_START_YR = '2013'  

现在，对于ORIGINAL_MESSAGE_SEQ_NO的每个Null（空白）值，我需要在Map中创建一个新密钥（密钥将是MESSAGE_SEQUENCE_NO），该值将是该消息序列号下所有子消息的列表。

例如： 其中一个映射键是MESSAGE_SEQUENCE_NO = 12，列表将是序列为12,13和15的消息

任何帮助或想法？

Answer 1

mybatis不支持开箱即用，但可以通过实现自定义ResultHandler来完成。

为此，应修改查询以包含每行的键。像这样使用CONNECT_BY_ROOT运算符：

SELECT * FROM (
   SELECT *, CONNECT_BY_ROOT MESSAGE_SEQUENCE_NO as ROOT_MESSAGE_SEQUENCE_NO
   FROM   MA0101.MESSAGE_NOTIFICATION 
   START WITH ORIGINAL_MESSAGE_SEQ_NO IS NULL 
   CONNECT BY PRIOR MESSAGE_SEQUENCE_NO = ORIGINAL_MESSAGE_SEQ_NO
   ORDER SIBLINGS BY LAST_UPDATED_DT DESC)
WHERE (SENDER_NYL_ID = 'T57HI9H' OR RECEIVER_NYL_ID = 'T57HI9H')
      AND FISCAL_START_YR = '2013'  

然后应该实现自定义ResultHandler。在mybatis wiki中查找example。