1
所以,我有如下表,我必須映射到Java對象:如何映射myBatis中的一對多關係?
+---------+-----------+---------------------+---------------------+--------+
| task_id | attribute | lastModified | activity | row_id |
+---------+-----------+---------------------+---------------------+--------+
| 1 | 1 | 2016-08-23 21:05:09 | first activity | 1 |
| 1 | 3 | 2016-08-23 21:08:28 | connect to db | 2 |
| 1 | 3 | 2016-08-23 21:08:56 | create web services | 3 |
| 1 | 4 | 2016-08-23 21:08:56 | data dump | 4 |
| 1 | 5 | 2016-08-23 21:08:56 | test cases | 5 |
| 1 | 6 | 2016-08-23 21:08:57 | dao object | 6 |
| 1 | 7 | 2016-08-23 21:08:57 | buy streetfood | 7 |
| 2 | 6 | 2016-08-23 21:08:57 | drink coke | 8 |
| 2 | 6 | 2016-08-23 21:09:00 | drink tea | 9 |
| 2 | 1 | 2016-08-23 21:12:30 | make tea | 10 |
| 2 | 2 | 2016-08-23 21:13:32 | charge phone | 11 |
| 2 | 3 | 2016-08-23 21:13:32 | shower | 12 |
| 2 | 4 | 2016-08-23 21:13:32 | sleep | 13 |
+---------+-----------+---------------------+---------------------+--------+
在這裏,每個Task
對象(由task_id
列標識)具有多個attribute
對象。這些屬性對象具有lastModified
和activity
字段。到目前爲止,我的方法是創建一個對象,通過myBatis將表的每一行映射到一個對象。然後做一些Java端處理來排序。有沒有一種方法可以通過myBatis註釋和/或xml直接映射此表,以便創建2個Task對象,每個對象都有一個填充的Atttribute對象列表?