python data_error ai_generated true

sqlalchemy.exc.StatementError: (sqlalchemy.exc.InvalidRequestError) Can't reconnect until invalid transaction is rolled back

ID: python/pytest-sqlalchemy-connection-closed

Also available as: JSON · Markdown · 中文
80%Fix Rate
88%Confidence
0Evidence
2025-09-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

A previous database operation failed, leaving the transaction in an invalid state. Subsequent queries fail until the transaction is explicitly rolled back.

generic

中文

之前的数据库操作失败，导致事务处于无效状态。在事务显式回滚之前，后续查询会失败。

Workarounds

  1. 98% success 
    try:
    session.execute(...)
except Exception:
    session.rollback()
    raise
  2. 95% success 
    @pytest.fixture
def db_session():
    session = Session()
    yield session
    session.rollback()
    session.close()
  3. 90% success 
    with session.begin():
    session.execute(...)
# automatically rolls back on exception

Dead Ends

Common approaches that don't work:

  1. 90% fail

    This is disruptive and does not address the application-level transaction handling issue.

  2. 85% fail

    The issue is not about pool size but about transaction state.

  3. 95% fail

    Retrying without rollback will keep failing.