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�܋f�1 � �Z � d Z ddlmZ ddlmZ G d� de� � Z G d� de� � ZdS ) a Deprecated core event interfaces.
.. deprecated:: 0.7
As of SQLAlchemy 0.7, the new event system described in
:ref:`event_toplevel` replaces the extension/proxy/listener system,
providing a consistent interface to all events without the need for
subclassing.
� )�event)�utilc �@ � e Zd ZdZed� � � Zd� Zd� Zd� Zd� Z dS )� PoolListenera� Hooks into the lifecycle of connections in a :class:`_pool.Pool`.
.. deprecated:: 0.7
:class:`.PoolListener` is deprecated and will be removed in a future
release. Please refer to :func:`.event.listen` in conjunction with
the :class:`_events.PoolEvents` listener interface.
Usage::
class MyListener(PoolListener):
def connect(self, dbapi_con, con_record):
'''perform connect operations'''
# etc.
# create a new pool with a listener
p = QueuePool(..., listeners=[MyListener()])
# add a listener after the fact
p.add_listener(MyListener())
# usage with create_engine()
e = create_engine("url://", listeners=[MyListener()])
All of the standard connection :class:`~sqlalchemy.pool.Pool` types can
accept event listeners for key connection lifecycle events:
creation, pool check-out and check-in. There are no events fired
when a connection closes.
For any given DB-API connection, there will be one ``connect``
event, `n` number of ``checkout`` events, and either `n` or `n - 1`
``checkin`` events. (If a ``Connection`` is detached from its
pool via the ``detach()`` method, it won't be checked back in.)
These are low-level events for low-level objects: raw Python
DB-API connections, without the conveniences of the SQLAlchemy
``Connection`` wrapper, ``Dialect`` services or ``ClauseElement``
execution. If you execute SQL through the connection, explicitly
closing all cursors and other resources is recommended.
Events also receive a ``_ConnectionRecord``, a long-lived internal
``Pool`` object that basically represents a "slot" in the
connection pool. ``_ConnectionRecord`` objects have one public
attribute of note: ``info``, a dictionary whose contents are
scoped to the lifetime of the DB-API connection managed by the
record. You can use this shared storage area however you like.
There is no need to subclass ``PoolListener`` to handle events.
Any class that implements one or more of these methods can be used
as a pool listener. The ``Pool`` will inspect the methods
provided by a listener object and add the listener to one or more
internal event queues based on its capabilities. In terms of
efficiency and function call overhead, you're much better off only
providing implementations for the hooks you'll be using.
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con_records r r zPoolListener.connects � � � � r c � � dS )a Called exactly once for the first DB-API connection.
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Nr r s r r zPoolListener.first_connect r" r c � � dS )aC Called when a connection is retrieved from the Pool.
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the current checkout.
If you raise an ``exc.DisconnectionError``, the current
connection will be disposed and a fresh connection retrieved.
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using the new connection.
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zPoolListener.checkout� r" r c � � dS )a� Called when a connection returns to the pool.
Note that the connection may be closed, and may be None if the
connection has been invalidated. ``checkin`` will not be called
for detached connections. (They do not return to the pool.)
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con_record
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� Zd� Zd� ZdS )�ConnectionProxya> Allows interception of statement execution by Connections.
.. deprecated:: 0.7
:class:`.ConnectionProxy` is deprecated and will be removed in a future
release. Please refer to :func:`.event.listen` in conjunction with
the :class:`_events.ConnectionEvents` listener interface.
Either or both of the ``execute()`` and ``cursor_execute()``
may be implemented to intercept compiled statement and
cursor level executions, e.g.::
class MyProxy(ConnectionProxy):
def execute(self, conn, execute, clauseelement,
*multiparams, **params):
print "compiled statement:", clauseelement
return execute(clauseelement, *multiparams, **params)
def cursor_execute(self, execute, cursor, statement,
parameters, context, executemany):
print "raw statement:", statement
return execute(cursor, statement, parameters, context)
The ``execute`` argument is a function that will fulfill the default
execution behavior for the operation. The signature illustrated
in the example should be used.
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the ``proxy`` argument::
e = create_engine('someurl://', proxy=MyProxy())
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