1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
#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 source title body)
(query-row conn "SELECT timestamp, hash, source, title, body FROM diary.articles WHERE article_id = $1" article-id)])
(make-article article-id (sql-datetime->srfi-date timestamp) hash source title body)))
(define (fetch-latest-articles conn limit)
(define article-list
(for/list ([(article-id timestamp hash source title body)
(in-query conn "
SELECT article_id, timestamp, hash, source, title, body FROM diary.articles ORDER BY timestamp DESC LIMIT $1
"
limit)])
(make-article article-id (sql-datetime->srfi-date timestamp) hash source 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, source, title, body)
VALUES($1, $2, $3, $4, $5, $6)
"
(article-id article)
(srfi-date->sql-timestamp-tz (article-timestamp article))
(article-hash article)
(article-source article)
(article-title article)
(article-body article)))
(define (update-article conn article)
(query-exec conn
"
UPDATE diary.articles
SET timestamp = $2,
hash = $3,
source = $4,
title = $5,
body = $6
WHERE article_id = $1
AND hash <> $3
"
(article-id article)
(srfi-date->sql-timestamp-tz (article-timestamp article))
(article-hash article)
(article-source 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)])
|
