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Represent the "root" transaction on a :class:`_engine.Connection`.
This corresponds to the current "BEGIN/COMMIT/ROLLBACK" that's occurring
for the :class:`_engine.Connection`. The :class:`_engine.RootTransaction`
is created by calling upon the :meth:`_engine.Connection.begin` method, and
remains associated with the :class:`_engine.Connection` throughout its
active span. The current :class:`_engine.RootTransaction` in use is
accessible via the :attr:`_engine.Connection.get_transaction` method of
:class:`_engine.Connection`.
In :term:`2.0 style` use, the :class:`_engine.Connection` also employs
"autobegin" behavior that will create a new
:class:`_engine.RootTransaction` whenever a connection in a
non-transactional state is used to emit commands on the DBAPI connection.
The scope of the :class:`_engine.RootTransaction` in 2.0 style
use can be controlled using the :meth:`_engine.Connection.commit` and
:meth:`_engine.Connection.rollback` methods.
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