Database() now accepts all three Python transaction handling modes and
behaves identically in each. For autocommit=False connections - where
the driver holds an implicit transaction open at all times - the
library tracks transaction ownership itself:
- A new _explicit_transaction flag distinguishes transactions opened
with begin()/atomic() from the driver's implicit one, exposed as a
new db.in_transaction property (conn.in_transaction is always True
in this mode)
- begin() claims the driver's implicit transaction instead of
executing BEGIN, which the driver would reject; BEGIN/COMMIT/
ROLLBACK passed to db.execute() are routed through begin()/commit()/
rollback()
- Writes outside a user transaction commit the implicit transaction
immediately, preserving the library's auto-commit contract
- Row-returning statements outside a transaction fetch eagerly and
commit, so the implicit read transaction does not hold a shared
lock that blocks writes from other connections
- PRAGMA and VACUUM run in temporary driver autocommit mode
(ensure_autocommit_on() now flips conn.autocommit), since PRAGMAs
are silently ignored and VACUUM refused inside the implicit
transaction
A new pytest --sqlite-autocommit-false option runs the entire suite
in this mode, wired into CI alongside --sqlite-autocommit. Tests that
asserted on conn.in_transaction or wrote through db.conn without
committing now use the mode-aware library API instead.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PFkrS2nuP8mo1jmT594VCd
Table.delete_where() ran its DELETE via a bare execute() with no
commit, unlike Table.delete() which wraps in db.atomic(). The
connection was left with an open implicit transaction, so the
deletion (and all subsequent writes, including later atomic()
blocks which switched to savepoint mode) was silently rolled back
when the connection closed.
Wrap the DELETE in db.atomic() and remove the now-unnecessary
atomic() wrapper from the delete_where documentation example.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UnLnhsH25Nnv7LHhekUfPd
