MyBatis查询数据,赋值给List集合时,数据缺少的问题及解决

  List<ArticleCommentToShow> commentsByArticleId = articleCommentService.getCommentsByArticleId(article.getArticleId());
            logger.info("长度：" + commentsByArticleId.size());

    /**
     * 评论用户头像
     */
    private String imagePath;
    /**
     * 评论用户的用户名
     */
    private String userName;
    /**
     * 评论实体类
     */
    private ArticleComment articleComment;

   <!--对应于getCommentsByArticleId的需要字段-->
    <sql id="wholeCommon">
        user_name,image_path,article_comment_id,comment_content, comment_time, to_id,article_comment.user_id,article_comment.article_id,to_user_id
    </sql>
    <!--根据文章ID获取评论-->
    <select id="getCommentsByArticleId" resultMap="CommentsResult">
        select
        <include refid="wholeCommon"/>
        from article_comment,user
        <where>
            (article_id = #{articleId} and article_comment.user_id =  user.user_id)
        </where>
    </select>
    <resultMap id="CommentsResult" type="com.molihub.entity.ArticleCommentToShow">
        <result property="userName" column="user_name"/>
        <result property="imagePath" column="image_path"/>
        <association property="articleComment" javaType="com.molihub.entity.ArticleComment">
            <id property="articleCommentId" column="article_comment_id"/>
            <result property="articleId" column="article_id"/>
            <result property="commentContent" column="comment_content"/>
            <result property="commentTime" column="comment_time"/>
            <result property="toId" column="to_id"/>
            <result property="userId" column="user_id"/>
            <result property="toUserId" column="to_user_id"/>
        </association>
    </resultMap>

   <resultMap id="CommentsResult" type="com.molihub.entity.ArticleCommentToShow">
        <id property="articleComment.articleCommentId" column="article_comment_id"/>
        <result property="userName" column="user_name"/>
        <result property="imagePath" column="image_path"/>
        <result property="articleComment.articleId" column="article_id"/>
        <result property="articleComment.commentContent" column="comment_content"/>
        <result property="articleComment.commentTime" column="comment_time"/>
        <result property="articleComment.toId" column="to_id"/>
        <result property="articleComment.userId" column="user_id"/>
        <result property="articleComment.toUserId" column="to_user_id"/>
    </resultMap>