a stale data error with date/time fields is usually a mismatch between the date/time value you have locally and the one that's in the database,. assuming you are using the datetime column as a "version_id" in your mapping. Issues like strings vs. datetimes and/or microseconds portions being present or non-present are the most common.
would need to see SQL debug logging to have more insight / confirm that's the problem. On Fri, Sep 1, 2023, at 11:59 AM, Dumitru Gîra wrote: > I have encountered a very strange behaviour and I don't know where to look > further. > I have a small API https://pastebin.com/qW01jNz8 with 2 endpoints: one to > update the name (VARCHAR) and one to update the last_login (DATETIME). > > If I make 10 consecutive requests to /update-string - everything works as > expected. > If I make 10 consecutive requests to /update-datetime - the first request > works and other 9 fail with sqlalchemy.orm.exc.StaleDataError. > NOTE: putting a time.sleep(1) after every request does not raise the error > > Consecutive requests are being made using the simple snippet > import requests > for i in range(10): > r = requests.put('http://0.0.0.0:8080/update-datetime') > print(r.text, r.code) > > The source code and the logs are in above link and for the reference I am > using: > - MySQL 8.0, but the same happens with 5.7 > - mysqldb connector, but the same happens with pymysql > - SQLAlchemy==1.4.49 > > Is this related to MySQL and specifically to date/time related fields (as the > same happens with TIMESTAMP) or can it be something from SQLAlchemy side? > Any directions would be highly appreciated. > > Kind regards, > Dumitru > > > -- > SQLAlchemy - > The Python SQL Toolkit and Object Relational Mapper > > http://www.sqlalchemy.org/ > > To post example code, please provide an MCVE: Minimal, Complete, and > Verifiable Example. See http://stackoverflow.com/help/mcve for a full > description. > --- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sqlalchemy+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sqlalchemy/e53169bd-617f-41f3-b9d3-8002ea75496an%40googlegroups.com > > <https://groups.google.com/d/msgid/sqlalchemy/e53169bd-617f-41f3-b9d3-8002ea75496an%40googlegroups.com?utm_medium=email&utm_source=footer>. -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/8ddfacc0-e23b-4672-b05f-92b2517d830a%40app.fastmail.com.
