ok great! thanks again! On Monday, May 17, 2021 at 4:32:02 PM UTC-6 Mike Bayer wrote:
> > > On Mon, May 17, 2021, at 6:22 PM, Anupama Goparaju wrote: > > Thanks for the quick reply. Correct, using the same recipe of cx_Oracle > SessionPool + SQLAlchemy NullPool. > If we handle the connection close explicitly to release to the pool, will > that skip any exception handling on connections that Session object handles > internally for db connections and also any rollbacks on errors? > > > I dont see any error handling that would be skipped, connection-level > error handling is all within the connection itself. a rollback() is > separate from the scope of the connection and the Session will > begin/commit/rollback on that connection. > > > On Monday, May 17, 2021 at 3:08:34 PM UTC-6 Mike Bayer wrote: > > > > On Mon, May 17, 2021, at 4:21 PM, Anupama Goparaju wrote: > > Hi, > > I see in the documentation > <https://docs.sqlalchemy.org/en/13/orm/session_basics.html> that we can > bind a connection to a SQLAlchemy session object: > > *# at the module level, the global sessionmaker,* *# bound to a specific > Engine* > Session = sessionmaker(bind=engine) > > *#** later, some unit of code wants to create a* *# Session that is bound > to a specific Connection* conn = engine.connect() > session = Session(bind=conn) > > How do we release the connection to an external connection pool safely? > For instance, if we are using a cx_Oracle SessionPool > <https://cx-oracle.readthedocs.io/en/latest/api_manual/session_pool.html> > to acquire and release connections? > session.close() is not doing that seamlessly in this case. > > if we do, session = Session(bind=engine) - it usually releases connection > to the pool seamlessly on session.close(). > > > if you acquire a connection using engine.connect(), you must release it to > the connection pool using connection.close(). this is independent of the > Session being bound to this Connection while it is acquired from the > pool. Session.close() will not achieve this when you are using > Session(bind=connection) as the Session understands the scope of this > Connection is external to that Session. > > This is then a separate issue from the use of cx_Oracle's SessionPool, for > which we would assume you are using the recipe at > https://docs.sqlalchemy.org/en/14/dialects/oracle.html#using-cx-oracle-sessionpool > > . > > > > Thanks, > Anupama > > > > -- > 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+...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sqlalchemy/66a43491-e94b-4b9c-a2ff-6e4ec8ee2cccn%40googlegroups.com > > <https://groups.google.com/d/msgid/sqlalchemy/66a43491-e94b-4b9c-a2ff-6e4ec8ee2cccn%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+...@googlegroups.com. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/sqlalchemy/a47048cd-178b-4191-bc42-23abeede0d69n%40googlegroups.com > > <https://groups.google.com/d/msgid/sqlalchemy/a47048cd-178b-4191-bc42-23abeede0d69n%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/810f8a7e-f351-4100-b8d7-60c32bbf5728n%40googlegroups.com.
