{
  "id": "python/pytest-sqlalchemy-connection-closed",
  "signature": "sqlalchemy.exc.StatementError: (sqlalchemy.exc.InvalidRequestError) Can't reconnect until invalid transaction is rolled back",
  "signature_zh": "sqlalchemy.exc.StatementError: (sqlalchemy.exc.InvalidRequestError) 在无效事务回滚之前无法重新连接",
  "regex": "sqlalchemy\\.exc\\.StatementError:\\ \\(sqlalchemy\\.exc\\.InvalidRequestError\\)\\ Can't\\ reconnect\\ until\\ invalid\\ transaction\\ is\\ rolled\\ back",
  "domain": "python",
  "category": "data_error",
  "subcategory": null,
  "root_cause": "A previous database operation failed, leaving the transaction in an invalid state. Subsequent queries fail until the transaction is explicitly rolled back.",
  "root_cause_type": "generic",
  "root_cause_zh": "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。",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "This is disruptive and does not address the application-level transaction handling issue.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "The issue is not about pool size but about transaction state.",
      "fail_rate": 0.85,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Retrying without rollback will keep failing.",
      "fail_rate": 0.95,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "",
      "success_rate": 0.98,
      "how": "try:\n    session.execute(...)\nexcept Exception:\n    session.rollback()\n    raise",
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "success_rate": 0.95,
      "how": "@pytest.fixture\ndef db_session():\n    session = Session()\n    yield session\n    session.rollback()\n    session.close()",
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "success_rate": 0.9,
      "how": "with session.begin():\n    session.execute(...)\n# automatically rolls back on exception",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": null,
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.88,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2025-09-01",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}