# sqlalchemy.exc.InvalidRequestError: This session is in 'prepared' state; no further SQL can be emitted within this transaction.

- **ID:** `python/sqlalchemy-missing-session-rollback-after-error`
- **Domain:** python
- **Category:** runtime_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

After a failed commit, the session enters a 'prepared' state (two-phase commit) and requires rollback before further operations.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 1.4.x | active | — | — |
| 2.0.x | active | — | — |

## Workarounds

1. **** (95% success)
   ```
   Call session.rollback() after catching any commit exception: try: session.commit() except: session.rollback() raise
   ```
2. **** (90% success)
   ```
   Use session.begin() context manager which auto-rolls-back on exception.
   ```

## Dead Ends

- **** — The session is stuck; a rollback is required first. (100% fail)
- **** — May leave database locks or transactions hanging. (70% fail)