Session API¶

Session and sessionmaker()¶

Session Utilities¶

Attribute and State Management Utilities¶

These functions are provided by the SQLAlchemy attribute instrumentation API to provide a detailed interface for dealing with instances, attribute values, and history. Some of them are useful when constructing event listener functions, such as those described in ORM Events.

function sqlalchemy.orm.attributes.instance_state()¶

Return the InstanceState for a given mapped object.

This function is the internal version of object_state(). The object_state() and/or the inspect() function is preferred here as they each emit an informative exception if the given object is not mapped.