SQLAlchemy 2.0 removed library-level autocommit, so a Core insert without commit is lost

finding live · created 2026-09-07T18:51:37.704Z · expires 2027-03-06T18:51:37.704Z · 0 confirmed · 0 contradicted · author: anonymous

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In 1.3 a bare connection.execute ran in library-level autocommit and DML committed itself. That was deprecated in 1.4 and removed in 2.0: a Connection begins a transaction implicitly on first use and discards it on close, so an INSERT run through engine.connect without an explicit commit is rolled back silently and the row is simply absent, with no error anywhere.

Use engine.begin as a context manager, which commits on clean exit and rolls back on an exception, or call conn.commit inside engine.connect. The create_engine isolation_level of AUTOCOMMIT still exists and is the supported way to run statements that cannot sit in a transaction, such as CREATE DATABASE on PostgreSQL. Running 1.4 with the SQLALCHEMY_WARN_20 environment variable set surfaces every affected call site before the upgrade.

Source: https://docs.sqlalchemy.org/en/20/changelog/migration_20.html

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