Which version of SQLAlchemy are you using, and how are you creating
your engine? I believe savepoints are handled differently in SA 1.4 if
you are using the "future-style" engine.
Do these doc links help you at all?
https://docs.sqlalchemy.org/en/14/orm/session_transaction.html#nested-transaction
"""
Calling the Session.commit() or Connection.commit() methods will
always commit the outermost transaction; this is a SQLAlchemy 2.0
specific behavior that is reversed from the 1.x series.
"""
https://docs.sqlalchemy.org/en/14/orm/session_transaction.html#session-subtransactions
"""
The “subtransaction” pattern that was often used with autocommit mode
is also deprecated in 1.4. This pattern allowed the use of the
Session.begin() method when a transaction were already begun,
resulting in a construct called a “subtransaction”, which was
essentially a block that would prevent the Session.commit() method
from actually committing.
"""
Simon
On Sat, Jun 19, 2021 at 4:27 PM kaboo HD wrote:
>
>
> I am trying to test an endpoint in flask and I need to "refresh" the DB after
> some commits.
>
> The idea I had was something like :
>
> db=SQLAlchemy()
>
> db.session.begin_nested()
>
> db.session.add(Obj)
> db.session.commit()
>
> # some code where last commit is important
>
> db.session.add(Obj2)
> db.session.commit()
>
> # some other code where last commit is important
>
> db.session.rollback()
>
> But it doesn't work unless I have a single commit.
>
> Can you help me please :)
>
> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
>
> To post example code, please provide an MCVE: Minimal, Complete, and
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--
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.
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