sqlite-utils/sqlite_utils
Simon Willison 0566a9f128
Improve db.query() error handling and transaction safety
db.query() rejected statements roll back, RETURNING commits immediately.

Fixes two transaction bugs in db.query():

- A non-row-returning statement such as an UPDATE was executed and
  auto-committed by execute() before the ValueError was raised, so the
  write took effect despite being rejected. query() now runs the
  statement inside a savepoint and rolls it back before raising, so a
  rejected statement has no effect on the database - in every
  connection mode, including autocommit=True.

- INSERT ... RETURNING only committed once the returned generator was
  fully exhausted, so calling query() without iterating - or partially
  iterating with next() - left the transaction open and the write could
  be rolled back on close. The write is now completed and committed at
  call time, as the documentation already promised. Plain SELECTs are
  still fetched lazily.

Transaction control statements, VACUUM, ATTACH and DETACH never return
rows, so query() now rejects them without executing them. PRAGMA
statements skip the savepoint guard because some of them - such as
pragma journal_mode=wal - refuse to run inside a transaction.

Claude-Session: https://claude.ai/code/session_012U3iRfJoTZ5vd22cBSF2nJ
2026-07-04 17:40:48 -07:00
..
__init__.py New migrations system, ported from sqlite-migrate (#754) 2026-06-21 09:40:21 -07:00
__main__.py Support 'python -m sqlite_utils', closes #368 2022-01-08 18:33:22 -08:00
cli.py db.execute() write statements now commit automatically 2026-07-04 23:15:01 +00:00
db.py Improve db.query() error handling and transaction safety 2026-07-04 17:40:48 -07:00
hookspecs.py More type annotations (#697) 2025-12-16 22:11:47 -08:00
migrations.py Polish: clearer errors, corrected docstrings, setuptools pin 2026-07-04 19:13:15 +00:00
plugins.py fix: Plugins are still loaded when running tests (#719) 2026-06-21 16:14:45 -07:00
py.typed py.typed file so mypy picks up the types, closes #331 2021-11-14 15:21:04 -08:00
recipes.py More type annotations (#697) 2025-12-16 22:11:47 -08:00
utils.py Test against Python 3.15-dev, bump ty and Black (#738) 2026-05-17 16:52:48 -07:00