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#lang typed/racket
(require "../entities/article.rkt")
(require typed/db)
(module untyped-db-ops racket
(require db
db/util/datetime
"../entities/article.rkt")
(provide fetch-article
fetch-latest-articles
fetch-article-tags
fetch-article-taggings
insert-article-tagging
delete-article-tagging
fetch-article-hashes
update-article
insert-article)
(define (fetch-article conn article-id)
(match-let ([(vector timestamp hash title body)
(query-row conn "SELECT timestamp, hash, title, body FROM diary.articles WHERE article_id = $1" article-id)])
(make-article article-id (sql-datetime->srfi-date timestamp) hash title body)))
(define (fetch-latest-articles conn limit)
(define article-list
(for/list ([(article-id timestamp hash title body)
(in-query conn "
SELECT article_id, timestamp, hash, title, body FROM diary.articles ORDER BY timestamp DESC LIMIT $1
"
limit)])
(make-article article-id (sql-datetime->srfi-date timestamp) hash title body)))
(define article-tags
(for/hash ([(article-id l)
(in-query conn
"
SELECT article_id, name FROM diary.tags
JOIN diary.article_taggings USING (tag_id)
WHERE article_id = any ($1)
"
(map article-id article-list)
#:group #("article_id"))])
(values article-id (vector->list (car l)))))
(map (lambda (article)
(cond
[(hash-ref article-tags (article-id article) #f)
=> (curry article->article-with-tags article)]
[else
(article->article-with-tags article '())]))
article-list))
(define (fetch-article-tags conn article-id)
(for/list ([tag (in-query conn "
SELECT name FROM diary.tags
JOIN diary.article_taggings USING (tag_id)
WHERE article_id = $1
ORDER BY name
"
article-id)])
tag))
(define (delete-article-tagging conn article_id tag_id)
(query-exec conn
"
DELETE FROM diary.article_taggings
WHERE article_id = $1
AND tag_id = $2
"
article_id
tag_id))
(define (fetch-article-taggings conn article-id)
(for/set ([tag-id (in-query conn "SELECT tag_id FROM diary.article_taggings WHERE article_id = $1" article-id)])
tag-id))
(define (insert-article-tagging conn article_id tag_id)
(query-exec conn
"
INSERT INTO diary.article_taggings(article_id, tag_id)
VALUES($1, $2)
"
article_id
tag_id))
(define (insert-tag conn name)
(query-value conn
"
INSERT INTO diary.tags(name)
VALUES($1)
RETURNING tag_id
"
name))
(define (fetch-article-hashes conn)
(for/hash ([(article-id hash)
(in-query conn "SELECT article_id, hash FROM diary.articles")])
(values article-id hash)))
(define (insert-article conn article)
(query-exec conn
"
INSERT INTO diary.articles(article_id, timestamp, hash, title, body)
VALUES($1, $2, $3, $4, $5)
"
(article-id article)
(srfi-date->sql-timestamp-tz (article-timestamp article))
(article-hash article)
(article-title article)
(article-body article)))
(define (update-article conn article)
(query-exec conn
"
UPDATE diary.articles
SET timestamp = $2,
hash = $3,
title = $4,
body = $5
WHERE article_id = $1
AND hash <> $3
"
(article-id article)
(srfi-date->sql-timestamp-tz (article-timestamp article))
(article-hash article)
(article-title article)
(article-body article))))
(require/typed/provide (submod "." untyped-db-ops)
[fetch-article (-> Connection String Article)]
[fetch-latest-articles (-> Connection Natural (Listof Article-With-Tags))]
[fetch-article-tags (-> Connection String (Listof String))]
[fetch-article-hashes (-> Connection (Immutable-HashTable String String))]
[fetch-article-taggings (-> Connection String (Setof Integer))]
[insert-article-tagging (-> Connection String Integer Void)]
[delete-article-tagging (-> Connection String Integer Void)]
[update-article (-> Connection Article Void)]
[insert-article (-> Connection Article Void)])
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