65 lines
1.6 KiB
MySQL
65 lines
1.6 KiB
MySQL
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CREATE TABLE article_revisions_copy (
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article_id INTEGER NOT NULL,
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revision INTEGER NOT NULL,
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created TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
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title TEXT NOT NULL,
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body TEXT NOT NULL,
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PRIMARY KEY (article_id, revision),
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FOREIGN KEY (article_id) REFERENCES articles(id)
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);
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INSERT INTO article_revisions_copy SELECT * FROM article_revisions;
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DROP TABLE article_revisions;
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CREATE TABLE article_revisions (
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sequence_number INTEGER PRIMARY KEY NOT NULL,
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article_id INTEGER NOT NULL,
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revision INTEGER NOT NULL,
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created TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
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slug TEXT NOT NULL,
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title TEXT NOT NULL,
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body TEXT NOT NULL,
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-- Actually a synthetic property, namely revision = MAX(revision)
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-- GROUP BY article_id, but SQLite makes that so hard to work with:
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latest BOOLEAN NOT NULL,
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FOREIGN KEY (article_id) REFERENCES articles(id)
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);
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CREATE UNIQUE INDEX unique_revision_per_article_id ON article_revisions
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(article_id, revision);
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CREATE UNIQUE INDEX unique_latest_revision_per_article_id ON article_revisions
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(article_id) WHERE latest=1;
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CREATE INDEX slug_lookup ON article_revisions
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(slug, revision);
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INSERT INTO article_revisions SELECT
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ROWID,
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article_id,
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revision,
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created,
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CAST(article_id AS TEXT) AS slug,
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title,
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body,
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0
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FROM article_revisions_copy;
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UPDATE article_revisions
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SET latest = 1
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WHERE (article_id, revision) IN (
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SELECT article_id, MAX(revision) AS revision
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FROM article_revisions
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GROUP BY article_id
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);
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CREATE UNIQUE INDEX slugs_index ON article_revisions (slug, article_id) WHERE latest=1;
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