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Connection pooling for DB-API connections.

Provides a number of connection pool implementations for a variety of
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Also provides a DB-API 2.0 connection proxying mechanism allowing
regular DB-API connect() methods to be transparently managed by a
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    :param module: a DB-API 2.0 database module

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          connection recycling, which means upon checkout, if this
          timeout is surpassed the connection will be closed and
          replaced with a newly opened connection. Defaults to -1.

        :param logging_name:  String identifier which will be used within
          the "name" field of logging records generated within the
          "sqlalchemy.pool" logger. Defaults to a hexstring of the object's
          id.

        :param echo: If True, connections being pulled and retrieved
          from the pool will be logged to the standard output, as well
          as pool sizing information.  Echoing can also be achieved by
          enabling logging for the "sqlalchemy.pool"
          namespace. Defaults to False.

        :param use_threadlocal: If set to True, repeated calls to
          :meth:`connect` within the same application thread will be
          guaranteed to return the same connection object, if one has
          already been retrieved from the pool and has not been
          returned yet.  Offers a slight performance advantage at the
          cost of individual transactions by default.  The
          :meth:`.Pool.unique_connection` method is provided to return
          a consistenty unique connection to bypass this behavior
          when the flag is set.

          .. warning::  The :paramref:`.Pool.use_threadlocal` flag
             **does not affect the behavior** of :meth:`.Engine.connect`.
             :meth:`.Engine.connect` makes use of the
             :meth:`.Pool.unique_connection` method which **does not use thread
             local context**.  To produce a :class:`.Connection` which refers
             to the :meth:`.Pool.connect` method, use
             :meth:`.Engine.contextual_connect`.

             Note that other SQLAlchemy connectivity systems such as
             :meth:`.Engine.execute` as well as the orm
             :class:`.Session` make use of
             :meth:`.Engine.contextual_connect` internally, so these functions
             are compatible with the :paramref:`.Pool.use_threadlocal` setting.

          .. seealso::

            :ref:`threadlocal_strategy` - contains detail on the
            "threadlocal" engine strategy, which provides a more comprehensive
            approach to "threadlocal" connectivity for the specific
            use case of using :class:`.Engine` and :class:`.Connection` objects
            directly.

        :param reset_on_return: Determine steps to take on
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          reset_on_return can have any of these values:

          * ``"rollback"`` - call rollback() on the connection,
            to release locks and transaction resources.
            This is the default value.  The vast majority
            of use cases should leave this value set.
          * ``True`` - same as 'rollback', this is here for
            backwards compatibility.
          * ``"commit"`` - call commit() on the connection,
            to release locks and transaction resources.
            A commit here may be desirable for databases that
            cache query plans if a commit is emitted,
            such as Microsoft SQL Server.  However, this
            value is more dangerous than 'rollback' because
            any data changes present on the transaction
            are committed unconditionally.
          * ``None`` - don't do anything on the connection.
            This setting should only be made on a database
            that has no transaction support at all,
            namely MySQL MyISAM.   By not doing anything,
            performance can be improved.   This
            setting should **never be selected** for a
            database that supports transactions,
            as it will lead to deadlocks and stale
            state.
          * ``"none"`` - same as ``None``

            .. versionadded:: 0.9.10

          * ``False`` - same as None, this is here for
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          .. versionchanged:: 0.7.6
              :paramref:`.Pool.reset_on_return` accepts ``"rollback"``
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        :param events: a list of 2-tuples, each of the form
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        :param listeners: Deprecated.  A list of
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