python runtime_error ai_generated true

sqlalchemy.exc.PendingRollbackError: Can't reconnect until invalid transaction is rolled back. Please rollback() fully before proceeding

ID: python/sqlalchemy-missing-session-commit

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2024-03-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.4.x active — — —
2.0.x active — — —

Root Cause

A previous SQL operation failed (e.g., constraint violation) but the session was not rolled back. Subsequent operations on the same session trigger this error because the transaction remains in a failed state.

generic

中文

之前的 SQL 操作失败（如违反约束），但会话未回滚。后续在同一会话上的操作会触发此错误，因为事务仍处于失败状态。

Workarounds

  1. 95% success 
    Explicitly rollback the session after any exception: try: session.commit() except: session.rollback() raise
  2. 90% success 
    Use a context manager pattern: with session.begin(): # operations - automatically rolls back on exception

Dead Ends

Common approaches that don't work:

  1. 90% fail

    close() does not reset the transaction state; it only releases connections. The next session usage still carries the failed transaction.

  2. 100% fail

    The error is persistent until rollback is explicitly called; retrying the same failed operation doesn't clear the invalid transaction flag.