mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-06-04 06:48:27 -04:00
c3352e5542
multiple aliases of the same class (will add tests in [ticket:1218]) - Added a new extension sqlalchemy.ext.serializer. Provides Serializer/Deserializer "classes" which mirror Pickle/Unpickle, as well as dumps() and loads(). This serializer implements an "external object" pickler which keeps key context-sensitive objects, including engines, sessions, metadata, Tables/Columns, and mappers, outside of the pickle stream, and can later restore the pickle using any engine/metadata/session provider. This is used not for pickling regular object instances, which are pickleable without any special logic, but for pickling expression objects and full Query objects, such that all mapper/engine/session dependencies can be restored at unpickle time.