deliver/src/main/resources/mapper/posts/PostsCommentsMapper.xml

<?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.sumbytes.helloblog.posts.dao.PostsCommentsDao">

    <!-- 通用查询映射结果 -->
    <resultMap id="BaseResultMap" type="com.sumbytes.helloblog.posts.domain.po.PostsComments">
        <id column="id" property="id"/>
        <result column="create_time" property="createTime"/>
        <result column="author_id" property="authorId"/>
        <result column="content" property="content"/>
        <result column="parent_id" property="parentId"/>
        <result column="status" property="status"/>
        <result column="posts_id" property="postsId"/>
        <result column="tree_path" property="treePath"/>
    </resultMap>

    <select id="selectPostsCommentsByPostsIdList" resultType="com.sumbytes.helloblog.posts.domain.vo.PostsCommentsVO">
        SELECT
        postsComments.id,
        postsComments.content,
        postsComments.create_time createTime,
        authUser.name authorName,
        authUser.avatar authorAvatar,
        parentAuthUser.name parentUserName
        FROM
        hello_blog_posts_comments postsComments
        LEFT JOIN hello_blog_auth_user authUser ON postsComments.author_id = authUser.id
        LEFT JOIN hello_blog_posts_comments parentPostsComments ON postsComments.parent_id = parentPostsComments.id
        LEFT JOIN hello_blog_auth_user parentAuthUser ON parentAuthUser.id = ( SELECT author_id FROM hello_blog_posts_comments WHERE id = postsComments.parent_id )
        <where>
            postsComments.posts_id = #{postsId}
        </where>
        ORDER BY postsComments.id DESC
    </select>

    <select id="selectPostsCommentsList" resultType="com.sumbytes.helloblog.posts.domain.vo.PostsCommentsVO">
        SELECT
        postsComments.id as id,
        postsComments.content,
        authUser.name as authorName,
        authUser.avatar as authorAvatar,
        parentAuthUser.name as parentUserName,
        posts.title as postTitle
        FROM
        hello_blog_posts_comments postsComments
        LEFT JOIN hello_blog_auth_user authUser ON postsComments.author_id = authUser.id
        LEFT JOIN hello_blog_posts_comments parentPostsComments ON postsComments.id = parentPostsComments.parent_id
        LEFT JOIN hello_blog_auth_user parentAuthUser ON parentAuthUser.id = ( SELECT author_id FROM hello_blog_posts_comments WHERE id = postsComments.parent_id )
        LEFT JOIN hello_blog_posts posts ON posts.id = postsComments.posts_id
        <where>
            <if test="postsComments.keywords != null and postsComments.keywords != ''">
                ( postsComments.content LIKE #{postsComments.keywords} OR posts.title LIKE #{postsComments.keywords} )
            </if>
            <if test="postsComments.id!=null">
                and postsComments.id=#{postsComments.id}
            </if>
        </where>
        ORDER BY postsComments.id DESC
    </select>
</mapper>