<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace="com.pz.system.mapper.ArticleCommentMapper" > <select id="selectByArticleComment" resultType="com.pz.system.domain.vo.ArticleCommentVo"> SELECT a.*,s.avatar,s.user_name FROM article_comment a left join sys_user s on s.user_id = a.uid WHERE a.aid = #{aid} </select> </mapper>