spring-boot-realworld-examp.../src/main/resources/mapper/ArticleReadService.xml

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<?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="io.spring.application.article.ArticleReadService">
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<sql id="profileColumns">
U.id userId,
U.username userUsername,
U.bio userBio,
U.image userImage
</sql>
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<sql id="selectArticleData">
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select
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A.id articleId,
A.slug articleSlug,
A.title articleTitle,
A.description articleDescription,
A.body articleBody,
A.created_at articleCreatedAt,
A.updated_at articleUpdatedAt,
T.name as tagName,
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<include refid="profileColumns"/>
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from
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articles A
left join article_tags AT on A.id = AT.article_id
left join tags T on T.id = AT.article_id
left join users U on U.id = A.user_id
</sql>
<select id="findById" resultMap="articleData">
<include refid="selectArticleData"/>
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where A.id = #{id}
</select>
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<select id="findBySlug" resultMap="articleData">
<include refid="selectArticleData"/>
where A.slug = #{slug}
</select>
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<resultMap id="articleData" type="io.spring.application.article.ArticleData">
<id column="articleId" property="id"/>
<result column="articleSlug" property="slug"/>
<result column="articleTitle" property="title"/>
<result column="articleDescription" property="description"/>
<result column="articleBody" property="body"/>
<result column="articleCreatedAt" property="createdAt"/>
<result column="articleUpdatedAt" property="updatedAt"/>
<association property="profileData" resultMap="profileData"/>
<collection property="tagList" ofType="arraylist" column="tagName" javaType="string"/>
</resultMap>
<resultMap id="profileData" type="io.spring.application.profile.ProfileData">
<id column="userId" property="id"/>
<result column="userUsername" property="username"/>
<result column="userBio" property="bio"/>
<result column="userImage" property="image"/>
</resultMap>
</mapper>