summaryrefslogtreecommitdiff
path: root/schema.sql
blob: 17de70ae5faec63ba6d6c636608124aa6d71f041 (plain)
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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
--*- mode: sql; product: postgres -*--

BEGIN TRANSACTION;

-- For PostgreSQL 9.1 upward, we should consider using enum types
-- instead of VARCHARs with CHECK constraints:
--
-- CREATE TYPE user_status AS
--   ENUM ('pending', 'approved', 'trusted', 'deferred', 'disabled', 'admin');
--
-- CREATE TYPE comment_status AS
--   ENUM ('pending', 'approved', 'trusted', 'deferred', 'spam', 'rejected');
--
-- CREATE TYPE text_format AS
--   ENUM ('html', 'text');


CREATE TABLE users(
  id      SERIAL  NOT NULL,
  name    VARCHAR,
  status  VARCHAR NOT NULL,
  email   VARCHAR,
  website VARCHAR,
  PRIMARY KEY (id),
  CHECK (status IN ('pending', 'approved', 'trusted', 'deferred', 'disabled',
                    'admin', 'visitor'))
);

CREATE TABLE passwords(
  "user"   INTEGER NOT NULL,
  password VARCHAR NOT NULL,
  PRIMARY KEY ("user", password),
  FOREIGN KEY ("user") REFERENCES users
);  

CREATE TABLE openids(
  "user" INTEGER NOT NULL,
  openid VARCHAR NOT NULL,
  PRIMARY KEY ("user", openid),
  FOREIGN KEY ("user") REFERENCES users
);  

CREATE TABLE login_certificates(
  "user"      INTEGER NOT NULL,
  certificate BYTEA  NOT NULL,
  PRIMARY KEY ("user", certificate),
  FOREIGN KEY ("user") REFERENCES users
);

CREATE TABLE article_types(
  id            SERIAL NOT NULL,
  name          VARCHAR,
  page_template VARCHAR,
  PRIMARY KEY (id)
);

CREATE TABLE articles(
  id   SERIAL  NOT NULL,
  type INTEGER NOT NULL,
  PRIMARY KEY (id),
  FOREIGN KEY (type) REFERENCES article_types
);

CREATE TABLE article_aliases(
  alias   VARCHAR NOT NULL,
  article INTEGER NOT NULL,
  PRIMARY KEY (alias),
  FOREIGN KEY (article) REFERENCES articles
);

CREATE TABLE comments(
  id        SERIAL  NOT NULL,
  article   INTEGER NOT NULL,
  global_id VARCHAR,
  PRIMARY KEY (id),
  FOREIGN KEY (article) REFERENCES articles
);

CREATE TABLE article_revisions(
  id        SERIAL    NOT NULL,
  article   INTEGER   NOT NULL,
  date      TIMESTAMP DEFAULT now(),
  title     VARCHAR   NOT NULL,
  content   VARCHAR   NOT NULL,
  author    INTEGER,
  format    VARCHAR   NOT NULL,
  status    VARCHAR   NOT NULL,
  global_id VARCHAR,
  PRIMARY KEY (id),
  FOREIGN KEY (article) REFERENCES articles,
  FOREIGN KEY (author)  REFERENCES users,
  CHECK (format IN ('html')),
  CHECK (status IN ('draft', 'published', 'syndicated')),
  UNIQUE (global_id)
);

CREATE TABLE article_revision_characteristics(
  revision       INTEGER NOT NULL,
  characteristic VARCHAR NOT NULL,
  value          VARCHAR,
  FOREIGN KEY (revision) REFERENCES article_revisions,
  UNIQUE (revision, characteristic, value)
);

CREATE TABLE article_revision_parenthood(
  parent INTEGER NOT NULL,
  child  INTEGER NOT NULL,
  PRIMARY KEY (parent, child),
  FOREIGN KEY (parent) REFERENCES article_revisions,
  FOREIGN KEY (child)  REFERENCES article_revisions
);

CREATE TABLE comment_revisions(
  id                   SERIAL    NOT NULL,
  comment              INTEGER   NOT NULL,
  date                 TIMESTAMP DEFAULT now(),
  content              VARCHAR   NOT NULL,
  author               INTEGER,
  submitter_ip         INET,
  submitter_user_agent VARCHAR,
  format               VARCHAR   NOT NULL,
  status               VARCHAR   NOT NULL,
  article_revision     INTEGER,
  PRIMARY KEY (id),
  FOREIGN KEY (comment) REFERENCES comments,
  FOREIGN KEY (author)  REFERENCES users,
  CHECK (status IN ('pending', 'approved', 'trusted', 'deferred', 'spam',
                    'rejected')),
  CHECK (format IN ('text'))
);

CREATE TABLE categories(
  id   SERIAL  NOT NULL,
  name VARCHAR NOT NULL,
  PRIMARY KEY (id)
);

CREATE TABLE category_inclusions(
  category      INTEGER NOT NULL,
  supercategory INTEGER NOT NULL,
  PRIMARY KEY (category, supercategory),
  FOREIGN KEY (category)      REFERENCES categories,
  FOREIGN KEY (supercategory) REFERENCES categories
);

CREATE TABLE article_category_memberships(
  article  INTEGER NOT NULL,
  category VARCHAR NOT NULL,
  PRIMARY KEY (article, category),
  FOREIGN KEY (article) REFERENCES articles
);

CREATE TABLE user_permissions(
  "user"     INTEGER NOT NULL,
  permission VARCHAR NOT NULL,
  status     BOOLEAN,
  PRIMARY KEY ("user", permission),
  FOREIGN KEY ("user") REFERENCES users
);

CREATE TABLE user_settings(
  "user"  INTEGER NOT NULL,
  setting VARCHAR NOT NULL,
  value   VARCHAR,
  PRIMARY KEY ("user", setting),
  FOREIGN KEY ("user") REFERENCES users
);


----

CREATE TYPE characteristic AS (
  characteristic VARCHAR,
  value          VARCHAR
);

CREATE TYPE characteristic_list AS (
  characteristics characteristic[]
);

CREATE FUNCTION article_revisions_for_characteristics_with_fixed_ones(
  article INTEGER,
  characteristics characteristic_list[],
  fixed_characteristics characteristic_list
) RETURNS INTEGER[] AS $BODY$
DECLARE
  query              VARCHAR        := $$SELECT id FROM article_revisions
                                          WHERE article = $$
                                       || quote_literal(article) ||
                                       $$   AND status IN ('published', 'syndicated')$$;
  fchar              RECORD;
  revisions          INTEGER[];
  specific_revisions INTEGER[];
  dummy              INTEGER;
BEGIN
  FOR fchar IN SELECT unnest(fixed_characteristics.characteristics) AS val LOOP
    query := query || $$AND EXISTS
                          (SELECT 1
                             FROM article_revision_characteristics
                            WHERE revision = article_revisions.id
                              AND characteristic = $$ || quote_literal((fchar.val::characteristic).characteristic) || $$
                              AND value = $$ || quote_literal((fchar.val::characteristic).value) || $$)$$;
  END LOOP;
  query := query || $$ORDER BY date DESC$$;
  EXECUTE ('SELECT array(' || query || ')') INTO revisions;
  IF array_length(revisions, 1) > 0 THEN
    IF array_length(characteristics, 1) > 0 THEN
      FOR fchar IN SELECT unnest(characteristics[1].characteristics) AS val LOOP
        specific_revisions := article_revisions_for_characteristics_with_fixed_ones(
          article,
          characteristics[2:array_upper(characteristics, 1)],
          ROW(array_prepend(fchar.val, fixed_characteristics.characteristics))::characteristic_list
        );
        IF array_length(specific_revisions, 1) > 0 THEN
          RETURN specific_revisions;
        END IF;
      END LOOP;
      RETURN revisions;
    ELSE
      RETURN revisions;
    END IF;
  ELSE
    RETURN ARRAY[]::INTEGER[];
  END IF;
END
$BODY$ LANGUAGE plpgsql STABLE;

CREATE FUNCTION article_revisions_for_characteristics(
  article INTEGER,
  characteristics characteristic_list[]
) RETURNS SETOF INTEGER AS $$
BEGIN
  RETURN QUERY SELECT unnest(article_revisions_for_characteristics_with_fixed_ones(article, characteristics, ROW(ARRAY[]::characteristic[])::characteristic_list));
END
$$ LANGUAGE plpgsql STABLE;

-- Usage example:
--   SELECT article_revisions_for_characteristics(70, ARRAY[ROW(ARRAY[ROW('language', 'de')::characteristic])]::characteristic_list[]);


CREATE FUNCTION older_revision(
  IN article_revisions,
  IN article_revisions,
  OUT article_revisions
) AS $$
  SELECT $1 WHERE $1.date < $2.date OR $2.date IS NULL
  UNION
  SELECT $2 WHERE $1.date >= $2.date OR $1.date IS NULL
  UNION
  SELECT $1 WHERE $1.date IS NULL AND $2.date IS NULL
$$ LANGUAGE SQL IMMUTABLE;

CREATE AGGREGATE oldest_revision (article_revisions) (
  SFUNC = older_revision,
  STYPE = article_revisions
);


CREATE FUNCTION more_recent_revision(
  IN article_revisions,
  IN article_revisions,
  OUT article_revisions
) AS $$
  SELECT $1 WHERE $1.date > $2.date OR $2.date IS NULL
  UNION
  SELECT $2 WHERE $1.date <= $2.date OR $1.date IS NULL
  UNION
  SELECT $1 WHERE $1.date IS NULL AND $2.date IS NULL
$$ LANGUAGE SQL IMMUTABLE;


CREATE AGGREGATE most_recent_revision (article_revisions) (
  SFUNC = more_recent_revision,
  STYPE = article_revisions
);


CREATE VIEW article_comment_counts AS
  SELECT a.id       AS article,
         count(c.*) AS comment_count
    FROM articles a
    LEFT OUTER JOIN comments c
      ON c.article = a.id
     AND EXISTS (SELECT *
                   FROM comment_revisions
                  WHERE comment = c.id
                    AND status IN ('approved', 'trusted'))
   GROUP BY a.id;


CREATE VIEW article_publishing_dates AS
  SELECT article   AS article,
         min(date) AS publishing_date
    FROM article_revisions
   WHERE status IN ('published', 'syndicated')
   GROUP BY article;


COMMIT;