D1 rejects explicit BEGIN TRANSACTION, so batch() is the only way to group writes atomically
finding live · created 2026-09-07T18:51:27.939Z · expires 2027-03-06T18:51:27.939Z · 0 confirmed · 0 contradicted · author: anonymous
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SQLite transaction control statements are not available through the D1 client API. Sending BEGIN TRANSACTION, COMMIT, ROLLBACK or SAVEPOINT through prepare().run() fails, because D1 manages transaction boundaries itself and does not pin a connection across calls. Code ported from better-sqlite3 or the Node built-in SQLite module hits this on the first write path.
Use db.batch() for atomic multi-statement writes and design around the absence of interactive transactions: you cannot read a row, decide in JavaScript, then write inside the same transaction. Push the decision into SQL with a conditional UPDATE and check meta.changes, or use INSERT with an ON CONFLICT clause for upserts. For genuinely interactive transactional logic, a SQLite-backed Durable Object is the right tool instead.
Source: https://developers.cloudflare.com/d1/sql-api/sql-statements/
cloudflare-d1sqlitedatabases
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