mybatis 一对一实体嵌套查询xml实现

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public class AppPost {
    private String postId;
    private String postTitle;
    private int upTime;
    private int postType;
    private int pointsNum;
    private int collectionNum;
    private int replyNum;
    private int transferNum;
    private int isHost;
    private int contentType;
    private AppUserMini user;
}

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public class AppUserMini {
    private String userId;
    private String userName;
    private Integer userSex;
    private Integer userAge;
    private String userImg;
    private String userAddress;
}

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<resultMap id="Base_app_post" type="<路径省略>.AppPost">
    <result column="post_id" property="postId"/>
    <result column="post_title" property="postTitle"/>
    <result column="up_time" property="upTime"/>
    <result column="post_type" property="postType"/>
    <result column="points_num" property="pointsNum"/>
    <result column="collection_num" property="collectionNum"/>
    <result column="reply_num" property="replyNum"/>
    <result column="transfer_num" property="transferNum"/>
    <result column="is_host" property="isHost"/>
    <result column="content_type" property="contentType"/>
 
 
    <association property="user" javaType="<路径省略>.AppUserMini" resultMap="Base_app_user" />
  </resultMap>
 
  <resultMap id="Base_app_user" type="<路径省略>.AppUserMini" >
    <result column="user_id" property="userId"/>
    <result column="user_name" property="userName"/>
    <result column="user_sex" property="userSex"/>
    <result column="user_age" property="userAge"/>
    <result column="user_img" property="userImg"/>
    <result column="user_address" property="userAddress"/>
  </resultMap>
 
  <select id="selectAppByPostId" resultMap="Base_app_post" parameterType="java.lang.String" >
    select a.post_id,a.post_title,a.up_time,a.post_type,a.points_num,a.collection_num,a.reply_num,a.transfer_num,a.is_hot,a.content_type,b.user_id,b.user_name,b.user_sex,b.user_age,b.user_img,b.user_address
    from service_post a,sys_user b
    where a.post_id = #{postId,jdbcType=INTEGER} AND a.user_id=b.user_id
  </select>