185 lines
4.4 KiB
SQL
185 lines
4.4 KiB
SQL
-- ============================================================================
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-- Articles & Favorites & Tags
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-- 要求 articles 表字段至少包含：
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-- id, slug, title, description, body, cover, author_id, views,
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-- is_top, is_featured, sort_weight, created_at, updated_at
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-- ============================================================================
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-- 创建文章（支持 cover）
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-- 单行返回 -> 使用 ^
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-- name: create_new_article^
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INSERT INTO articles (
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slug,
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title,
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description,
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body,
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cover,
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author_id,
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views
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) VALUES (
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:slug,
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:title,
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:description,
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:body,
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:cover,
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(SELECT id FROM users WHERE username = :author_username),
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0
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)
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RETURNING
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articles.id,
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articles.slug,
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articles.title,
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articles.description,
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articles.body,
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articles.cover,
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articles.views,
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articles.is_top,
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articles.is_featured,
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articles.sort_weight,
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articles.created_at,
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articles.updated_at,
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(SELECT username FROM users WHERE id = articles.author_id) AS author_username;
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-- 更新文章（包含 cover）
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-- 单行（返回 updated_at） -> ^
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-- name: update_article^
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UPDATE articles
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SET
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slug = COALESCE(:new_slug, slug),
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title = COALESCE(:new_title, title),
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body = COALESCE(:new_body, body),
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description = COALESCE(:new_description, description),
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cover = :new_cover
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WHERE
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slug = :slug
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AND author_id = (SELECT id FROM users WHERE username = :author_username)
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RETURNING updated_at;
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-- 删除文章
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-- 执行型，无返回 -> !
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-- name: delete_article!
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DELETE FROM articles
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WHERE
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slug = :slug
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AND author_id = (SELECT id FROM users WHERE username = :author_username);
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-- 根据 slug 获取单篇文章（带 cover）
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-- 单行返回 -> ^
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-- name: get_article_by_slug^
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SELECT
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a.id,
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a.slug,
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a.title,
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a.description,
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a.body,
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a.cover,
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a.views,
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a.is_top,
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a.is_featured,
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a.sort_weight,
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a.created_at,
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a.updated_at,
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u.username AS author_username
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FROM articles AS a
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JOIN users AS u ON u.id = a.author_id
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WHERE a.slug = :slug;
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-- Feed / 列表文章（带 cover）
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-- 多行结果 -> 不能用 ^
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-- name: get_articles_for_feed
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SELECT
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a.id,
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a.slug,
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a.title,
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a.description,
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a.body,
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a.cover,
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a.views,
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a.is_top,
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a.is_featured,
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a.sort_weight,
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a.created_at,
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a.updated_at,
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u.username AS author_username
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FROM articles AS a
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JOIN users AS u
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ON u.id = a.author_id
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JOIN followers_to_followings AS f
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ON f.following_id = u.id
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WHERE f.follower_id = (
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SELECT id FROM users WHERE username = :follower_username
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)
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ORDER BY a.is_top DESC, a.sort_weight DESC, a.created_at DESC
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LIMIT :limit OFFSET :offset;
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-- ======================================================================
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-- Tags 相关
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-- ======================================================================
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-- 给文章添加标签
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-- 执行型 -> !
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-- name: add_tags_to_article!
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INSERT INTO articles_to_tags (article_id, tag)
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SELECT a.id, :tag
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FROM articles a
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WHERE a.slug = :slug;
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-- 获取文章的所有标签
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-- name: get_tags_for_article_by_slug
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SELECT t.tag
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FROM articles_to_tags t
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JOIN articles a ON a.id = t.article_id
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WHERE a.slug = :slug
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ORDER BY t.tag;
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-- ======================================================================
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-- Favorites 相关
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-- ======================================================================
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-- 统计收藏数
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-- 单值 -> ^
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-- name: get_favorites_count_for_article^
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SELECT COUNT(*)::int AS favorites_count
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FROM favorites f
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JOIN articles a ON a.id = f.article_id
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WHERE a.slug = :slug;
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-- 是否已收藏
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-- 单值布尔 -> ^
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-- name: is_article_in_favorites^
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SELECT EXISTS (
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SELECT 1
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FROM favorites f
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JOIN articles a ON a.id = f.article_id
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JOIN users u ON u.id = f.user_id
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WHERE a.slug = :slug
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AND u.username = :username
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) AS favorited;
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-- 加入收藏
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-- 执行型 -> !
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-- name: add_article_to_favorites!
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INSERT INTO favorites (user_id, article_id)
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SELECT
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(SELECT id FROM users WHERE username = :username),
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(SELECT id FROM articles WHERE slug = :slug)
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ON CONFLICT DO NOTHING;
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-- 取消收藏
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-- 执行型 -> !
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-- name: remove_article_from_favorites!
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DELETE FROM favorites
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WHERE user_id = (SELECT id FROM users WHERE username = :username)
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AND article_id = (SELECT id FROM articles WHERE slug = :slug);
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-- ======================================================================
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-- Views 相关
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-- ======================================================================
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-- 访问量 +1，返回最新值
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-- name: increment_article_views^
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UPDATE articles
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SET views = views + 1
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WHERE slug = :slug
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RETURNING views;
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