python data_error ai_generated true

sqlalchemy.orm.exc.StaleDataError: UPDATE statement on table 'users' expected to match 1 row(s); 0 found

ID: python/sqlalchemy-stale-data-read

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2024-12-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

An optimistic concurrency check failed because the row was modified or deleted by another transaction since it was read.

generic

中文

乐观并发检查失败，因为自读取以来该行已被其他事务修改或删除。

Workarounds

  1. 95% success Re-query the object before updating 
    user = session.query(User).get(user_id)
if user:
    user.name = 'New Name'
    session.commit()
  2. 90% success Use session.refresh() to reload the object 
    session.refresh(user)
user.name = 'New Name'
session.commit()

Dead Ends

Common approaches that don't work:

  1. Ignoring the error and retrying the update 60% fail

    The row may have been deleted, so the update will still fail.

  2. Disabling versioning in the model 80% fail

    This removes concurrency protection, leading to potential data corruption.