28 lines
1.9 KiB
TypeScript
28 lines
1.9 KiB
TypeScript
import type Database from 'better-sqlite3';
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/** Keep metadata ahead of overflow pages, preserving IDs and all references. */
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export function migrateVersionLayout(handle: Database.Database): void {
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const columns = handle.pragma('table_info(script_versions)') as { name: string }[];
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if (columns.at(-1)?.name === 'content') return;
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const { sql } = handle.prepare("SELECT sql FROM sqlite_master WHERE name='script_versions'").get() as { sql: string };
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const content = /\bcontent\s+BLOB\s+NOT\s+NULL\s*,/i;
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if (!content.test(sql)) throw new Error('Unrecognized script version content layout');
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const replacement = sql.replace(content, '').replace(/,\s*UNIQUE\s*\(/i, ', content BLOB NOT NULL, UNIQUE(')
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.replace('script_versions', 'script_versions_metadata');
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const dependents = handle.prepare("SELECT sql FROM sqlite_master WHERE tbl_name='script_versions' AND type IN ('index','trigger') AND sql IS NOT NULL")
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.all() as { sql: string }[];
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const sequence = handle.prepare("SELECT seq FROM sqlite_sequence WHERE name='script_versions'").get() as { seq: number } | undefined;
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handle.pragma('foreign_keys = OFF');
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try {
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handle.transaction(() => {
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handle.exec(replacement);
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const names = columns.map(column => `"${column.name}"`).join(',');
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handle.exec(`INSERT INTO script_versions_metadata (${names}) SELECT ${names} FROM script_versions;
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DROP TABLE script_versions; ALTER TABLE script_versions_metadata RENAME TO script_versions;`);
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if (sequence) handle.prepare("UPDATE sqlite_sequence SET seq=MAX(seq,?) WHERE name='script_versions'").run(sequence.seq);
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for (const dependent of dependents) handle.exec(dependent.sql);
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if ((handle.pragma('foreign_key_check') as unknown[]).length) throw new Error('Version layout migration found broken references');
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})();
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} finally { handle.pragma('foreign_keys = ON'); }
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}
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