surwiki/migrations/20171024122359_add_article_fts_table/up.sql

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CREATE VIRTUAL TABLE article_search USING fts5(
title,
body,
slug UNINDEXED,
tokenize = 'porter unicode61 remove_diacritics 1'
);
INSERT INTO article_search(title, body, slug)
SELECT title, body, slug FROM article_revisions WHERE latest != 0;
CREATE TRIGGER article_revisions_ai AFTER INSERT ON article_revisions WHEN new.latest != 0 BEGIN
DELETE FROM article_search WHERE rowid = new.article_id;
INSERT INTO article_search(rowid, title, body, slug) VALUES (new.article_id, new.title, new.body, new.slug);
END;
CREATE TRIGGER article_revisions_ad AFTER DELETE ON article_revisions WHEN old.latest != 0 BEGIN
DELETE FROM article_search WHERE rowid = old.article_id;
END;
-- Index unique_latest_revision_per_article_id makes sure the following is sufficient:
CREATE TRIGGER article_revisions_au_disable AFTER UPDATE ON article_revisions WHEN old.latest != 0 AND new.latest == 0 BEGIN
DELETE FROM article_search WHERE rowid = old.article_id;
END;
CREATE TRIGGER article_revisions_au_enable AFTER UPDATE ON article_revisions WHEN old.latest == 0 AND new.latest != 0 BEGIN
INSERT INTO article_search(rowid, title, body, slug) VALUES (new.article_id, new.title, new.body, new.slug);
END;