46 lines
1.5 KiB
XML
46 lines
1.5 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
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<mapper namespace="com.imooc.mapper.CommentMapperCustom" >
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<!--
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FIXME
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思考：阿里规范明确规定不能超过三表关联，这里达到了四张表
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我们应该如何优化呢？使得sql脚本查询表位三表或者两表查询
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来实现呢又或者说我们能不能不使用数据库，使用别的手段（中间件）？mycat
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-->
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<select id="getCommentList" parameterType="map" resultType="com.imooc.vo.CommentVO">
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SELECT
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c.id as commentId,
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c.vlog_id as vlogId,
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u.id as vlogerId,
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u.nickname as commentUserNickname,
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u.face as commentUserFace,
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c.father_comment_id as fatherCommentId,
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c.comment_user_id as commentUserId,
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c.content as content,
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c.like_counts as likeCounts,
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fu.nickname as replyedUserNickname,
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c.create_time as createTime
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FROM
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`t_comment` as c
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LEFT JOIN
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t_users as u
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ON
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c.comment_user_id = u.id
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LEFT JOIN
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`t_comment` as fc
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ON
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c.father_comment_id = fc.id
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LEFT JOIN
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t_users as fu
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ON
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fc.comment_user_id = fu.id
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WHERE
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c.vlog_id = #{paramMap.vlogId}
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ORDER BY
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c.like_counts DESC,
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c.create_time DESC
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</select>
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</mapper> |