Hi Mike, thanks for the quick response. These would be the debug logs for
import requests for i in range(2): r = requests.put('http://0.0.0.0:8080/update-datetime') print(r.text, r.code) 2023-09-01 16:06:20,711 INFO sqlalchemy.engine.Engine SELECT DATABASE() 2023-09-01 16:06:20,711 INFO sqlalchemy.engine.Engine [raw sql] () 2023-09-01 16:06:20,713 DEBUG sqlalchemy.engine.Engine Col ('DATABASE()',) 2023-09-01 16:06:20,713 DEBUG sqlalchemy.engine.Engine Row ('dbname',) 2023-09-01 16:06:20,714 INFO sqlalchemy.engine.Engine SELECT @@sql_mode 2023-09-01 16:06:20,714 INFO sqlalchemy.engine.Engine [raw sql] () 2023-09-01 16:06:20,715 DEBUG sqlalchemy.engine.Engine Col ('@@sql_mode',) 2023-09-01 16:06:20,715 DEBUG sqlalchemy.engine.Engine Row ('ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION',) 2023-09-01 16:06:20,716 INFO sqlalchemy.engine.Engine SELECT @@lower_case_table_names 2023-09-01 16:06:20,716 INFO sqlalchemy.engine.Engine [raw sql] () 2023-09-01 16:06:20,717 DEBUG sqlalchemy.engine.Engine Col ('@@lower_case_table_names',) 2023-09-01 16:06:20,717 DEBUG sqlalchemy.engine.Engine Row (0,) 2023-09-01 16:06:20,717 INFO sqlalchemy.engine.Engine BEGIN (implicit) 2023-09-01 16:06:20,719 INFO sqlalchemy.engine.Engine SELECT foo.id AS foo_id, foo.last_login AS foo_last_login, foo.name AS foo_name FROM foo WHERE foo.id = %s LIMIT %s 2023-09-01 16:06:20,719 INFO sqlalchemy.engine.Engine [generated in 0.00016s] (1, 1) 2023-09-01 16:06:20,720 DEBUG sqlalchemy.engine.Engine Col ('foo_id', 'foo_last_login', 'foo_name') 2023-09-01 16:06:20,720 DEBUG sqlalchemy.engine.Engine Row (1, datetime.datetime(2023, 9, 1, 16, 6, 12), '2023-09-01 15:50:46.029445') 2023-09-01 16:06:20,722 INFO sqlalchemy.engine.Engine UPDATE foo SET last_login=%s WHERE foo.id = %s 2023-09-01 16:06:20,722 INFO sqlalchemy.engine.Engine [generated in 0.00014s] (datetime.datetime(2023, 9, 1, 16, 6, 20, 721146), 1) 2023-09-01 16:06:20,723 INFO sqlalchemy.engine.Engine COMMIT 192.168.0.1 - - [01/Sep/2023 16:06:20] "PUT /update-datetime HTTP/1.1" 200 - 2023-09-01 16:06:20,733 INFO sqlalchemy.engine.Engine BEGIN (implicit) 2023-09-01 16:06:20,733 INFO sqlalchemy.engine.Engine SELECT foo.id AS foo_id, foo.last_login AS foo_last_login, foo.name AS foo_name FROM foo WHERE foo.id = %s LIMIT %s 2023-09-01 16:06:20,733 INFO sqlalchemy.engine.Engine [cached since 0.01402s ago] (1, 1) 2023-09-01 16:06:20,734 DEBUG sqlalchemy.engine.Engine Col ('foo_id', 'foo_last_login', 'foo_name') 2023-09-01 16:06:20,735 DEBUG sqlalchemy.engine.Engine Row (1, datetime.datetime(2023, 9, 1, 16, 6, 21), '2023-09-01 15:50:46.029445') 2023-09-01 16:06:20,736 INFO sqlalchemy.engine.Engine UPDATE foo SET last_login=%s WHERE foo.id = %s 2023-09-01 16:06:20,736 INFO sqlalchemy.engine.Engine [cached since 0.01399s ago] (datetime.datetime(2023, 9, 1, 16, 6, 20, 735704), 1) 2023-09-01 16:06:20,737 INFO sqlalchemy.engine.Engine ROLLBACK 192.168.0.1 - - [01/Sep/2023 16:06:20] "PUT /update-datetime HTTP/1.1" 500 - Traceback (most recent call last): File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 2548, in __call__ return self.wsgi_app(environ, start_response) File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 2528, in wsgi_app response = self.handle_exception(e) File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 2525, in wsgi_app response = self.full_dispatch_request() File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1822, in full_dispatch_request rv = self.handle_user_exception(e) File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1820, in full_dispatch_request rv = self.dispatch_request() File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1796, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) File "/usr/src/app/sqa.py", line 69, in update_datetime db_session.commit() File "<string>", line 2, in commit File "/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 1454, in commit self._transaction.commit(_to_root=self.future) File "/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 832, in commit self._prepare_impl() File "/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 811, in _prepare_impl self.session.flush() File "/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 3449, in flush self._flush(objects) File "/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 3589, in _flush transaction.rollback(_capture_exception=True) File "/usr/local/lib/python3.8/site-packages/sqlalchemy/util/langhelpers.py", line 70, in __exit__ compat.raise_( File "/usr/local/lib/python3.8/site-packages/sqlalchemy/util/compat.py", line 211, in raise_ raise exception File "/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 3549, in _flush flush_context.execute() File "/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/unitofwork.py", line 456, in execute rec.execute(self) File "/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/unitofwork.py", line 630, in execute util.preloaded.orm_persistence.save_obj( File "/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/persistence.py", line 237, in save_obj _emit_update_statements( File "/usr/local/lib/python3.8/site-packages/sqlalchemy/orm/persistence.py", line 1035, in _emit_update_statements raise orm_exc.StaleDataError( sqlalchemy.orm.exc.StaleDataError: UPDATE statement on table 'foo' expected to update 1 row(s); 0 were matched. On Friday, September 1, 2023 at 7:02:56 PM UTC+3 Mike Bayer wrote: > 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. 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