one to many relation using mybatis or ibatis - ibatis

Question

I have database which has two tables
post:
id
post_name
post_desc
files:
file_id
file_name
post_attachments
post_id
file_id
In my xml mapping I already have
<select id="selectPosts" resultType="com.mycom.myproject.bean.postBean">
select id, post_name as postName from post
</select>
So its a one to many realtionship. I want all the files attached to a post. I don't understand how I can do the mapping in mybatis.
I have my PostBean like
public class PostBean extends Post {
private List<FileAttachment> filesAttachment;
//getter setter
}
I am using mybatis with spring and mysql as database
Please let me know if you need anything else.
--update--
I have modified my mapper.xml as
<resultMap id="BaseResultMap" type="com.mycom.myproject.db.mybatis.model.post">
<!--
WARNING - #mbggenerated
This element is automatically generated by MyBatis Generator, do not modify.
This element was generated on Tue Sep 11 10:14:08 BST 2012.
-->
<id column="id" jdbcType="BIGINT" property="id" />
<result column="post_name" jdbcType="VARCHAR" property="postName" />
<collection property="filesAttachment" ofType="com.mycom.myproject.db.mybatis.model.FileAttachment">
<id property="fileId" column="file_id" />
<id property="fileName" column="file_name" />
</collection>
--- update2 ---
Actually I have one mapping table also which I have created above so my query is like
<select id="selectPosts" parameterType="string" resultType="com.mycom.myproject.bean.postBean">
select p.id, p.post_name, fa.file_id as fileId, fa.file_name as fileName from post p
left outer join files f on f.post_id = p.id join post_attachments pa on pa.file_id = f.post_id
where p.id = 371
</select>

Answer 1

As shown in the manual, you have to write a more complex query and change the mapper.
The request will be something like that :
<select id="selectPosts" resultType="com.mycom.myproject.bean.postBean">
select id, post_name, file_id, file_name as postName from post left outer join files
</select>
And your result map :
<resultMap id="detailedPostResultMap" type="Blog">
<result property="id" column="id"/>
<result property="name" column="post_name"/>
<collection property=filesAttachment" ofType="FileAttachment">
<id property="fileId" column="file_id"/>
<result property="fileName" column="file_name"/>
</collection>
</resultMap>