mirror of
https://github.com/janeczku/calibre-web
synced 2024-11-18 07:44:54 +00:00
715 lines
26 KiB
Python
715 lines
26 KiB
Python
# sqlalchemy/events.py
|
|
# Copyright (C) 2005-2013 the SQLAlchemy authors and contributors <see AUTHORS file>
|
|
#
|
|
# This module is part of SQLAlchemy and is released under
|
|
# the MIT License: http://www.opensource.org/licenses/mit-license.php
|
|
|
|
"""Core event interfaces."""
|
|
|
|
from . import event, exc, util
|
|
engine = util.importlater('sqlalchemy', 'engine')
|
|
pool = util.importlater('sqlalchemy', 'pool')
|
|
|
|
|
|
class DDLEvents(event.Events):
|
|
"""
|
|
Define event listeners for schema objects,
|
|
that is, :class:`.SchemaItem` and :class:`.SchemaEvent`
|
|
subclasses, including :class:`.MetaData`, :class:`.Table`,
|
|
:class:`.Column`.
|
|
|
|
:class:`.MetaData` and :class:`.Table` support events
|
|
specifically regarding when CREATE and DROP
|
|
DDL is emitted to the database.
|
|
|
|
Attachment events are also provided to customize
|
|
behavior whenever a child schema element is associated
|
|
with a parent, such as, when a :class:`.Column` is associated
|
|
with its :class:`.Table`, when a :class:`.ForeignKeyConstraint`
|
|
is associated with a :class:`.Table`, etc.
|
|
|
|
Example using the ``after_create`` event::
|
|
|
|
from sqlalchemy import event
|
|
from sqlalchemy import Table, Column, Metadata, Integer
|
|
|
|
m = MetaData()
|
|
some_table = Table('some_table', m, Column('data', Integer))
|
|
|
|
def after_create(target, connection, **kw):
|
|
connection.execute("ALTER TABLE %s SET name=foo_%s" %
|
|
(target.name, target.name))
|
|
|
|
event.listen(some_table, "after_create", after_create)
|
|
|
|
DDL events integrate closely with the
|
|
:class:`.DDL` class and the :class:`.DDLElement` hierarchy
|
|
of DDL clause constructs, which are themselves appropriate
|
|
as listener callables::
|
|
|
|
from sqlalchemy import DDL
|
|
event.listen(
|
|
some_table,
|
|
"after_create",
|
|
DDL("ALTER TABLE %(table)s SET name=foo_%(table)s")
|
|
)
|
|
|
|
The methods here define the name of an event as well
|
|
as the names of members that are passed to listener
|
|
functions.
|
|
|
|
See also:
|
|
|
|
:ref:`event_toplevel`
|
|
|
|
:class:`.DDLElement`
|
|
|
|
:class:`.DDL`
|
|
|
|
:ref:`schema_ddl_sequences`
|
|
|
|
"""
|
|
|
|
def before_create(self, target, connection, **kw):
|
|
"""Called before CREATE statments are emitted.
|
|
|
|
:param target: the :class:`.MetaData` or :class:`.Table`
|
|
object which is the target of the event.
|
|
:param connection: the :class:`.Connection` where the
|
|
CREATE statement or statements will be emitted.
|
|
:param \**kw: additional keyword arguments relevant
|
|
to the event. The contents of this dictionary
|
|
may vary across releases, and include the
|
|
list of tables being generated for a metadata-level
|
|
event, the checkfirst flag, and other
|
|
elements used by internal events.
|
|
|
|
"""
|
|
|
|
def after_create(self, target, connection, **kw):
|
|
"""Called after CREATE statments are emitted.
|
|
|
|
:param target: the :class:`.MetaData` or :class:`.Table`
|
|
object which is the target of the event.
|
|
:param connection: the :class:`.Connection` where the
|
|
CREATE statement or statements have been emitted.
|
|
:param \**kw: additional keyword arguments relevant
|
|
to the event. The contents of this dictionary
|
|
may vary across releases, and include the
|
|
list of tables being generated for a metadata-level
|
|
event, the checkfirst flag, and other
|
|
elements used by internal events.
|
|
|
|
"""
|
|
|
|
def before_drop(self, target, connection, **kw):
|
|
"""Called before DROP statments are emitted.
|
|
|
|
:param target: the :class:`.MetaData` or :class:`.Table`
|
|
object which is the target of the event.
|
|
:param connection: the :class:`.Connection` where the
|
|
DROP statement or statements will be emitted.
|
|
:param \**kw: additional keyword arguments relevant
|
|
to the event. The contents of this dictionary
|
|
may vary across releases, and include the
|
|
list of tables being generated for a metadata-level
|
|
event, the checkfirst flag, and other
|
|
elements used by internal events.
|
|
|
|
"""
|
|
|
|
def after_drop(self, target, connection, **kw):
|
|
"""Called after DROP statments are emitted.
|
|
|
|
:param target: the :class:`.MetaData` or :class:`.Table`
|
|
object which is the target of the event.
|
|
:param connection: the :class:`.Connection` where the
|
|
DROP statement or statements have been emitted.
|
|
:param \**kw: additional keyword arguments relevant
|
|
to the event. The contents of this dictionary
|
|
may vary across releases, and include the
|
|
list of tables being generated for a metadata-level
|
|
event, the checkfirst flag, and other
|
|
elements used by internal events.
|
|
|
|
"""
|
|
|
|
def before_parent_attach(self, target, parent):
|
|
"""Called before a :class:`.SchemaItem` is associated with
|
|
a parent :class:`.SchemaItem`.
|
|
|
|
:param target: the target object
|
|
:param parent: the parent to which the target is being attached.
|
|
|
|
:func:`.event.listen` also accepts a modifier for this event:
|
|
|
|
:param propagate=False: When True, the listener function will
|
|
be established for any copies made of the target object,
|
|
i.e. those copies that are generated when
|
|
:meth:`.Table.tometadata` is used.
|
|
|
|
"""
|
|
|
|
def after_parent_attach(self, target, parent):
|
|
"""Called after a :class:`.SchemaItem` is associated with
|
|
a parent :class:`.SchemaItem`.
|
|
|
|
:param target: the target object
|
|
:param parent: the parent to which the target is being attached.
|
|
|
|
:func:`.event.listen` also accepts a modifier for this event:
|
|
|
|
:param propagate=False: When True, the listener function will
|
|
be established for any copies made of the target object,
|
|
i.e. those copies that are generated when
|
|
:meth:`.Table.tometadata` is used.
|
|
|
|
"""
|
|
|
|
def column_reflect(self, inspector, table, column_info):
|
|
"""Called for each unit of 'column info' retrieved when
|
|
a :class:`.Table` is being reflected.
|
|
|
|
The dictionary of column information as returned by the
|
|
dialect is passed, and can be modified. The dictionary
|
|
is that returned in each element of the list returned
|
|
by :meth:`.reflection.Inspector.get_columns`.
|
|
|
|
The event is called before any action is taken against
|
|
this dictionary, and the contents can be modified.
|
|
The :class:`.Column` specific arguments ``info``, ``key``,
|
|
and ``quote`` can also be added to the dictionary and
|
|
will be passed to the constructor of :class:`.Column`.
|
|
|
|
Note that this event is only meaningful if either
|
|
associated with the :class:`.Table` class across the
|
|
board, e.g.::
|
|
|
|
from sqlalchemy.schema import Table
|
|
from sqlalchemy import event
|
|
|
|
def listen_for_reflect(inspector, table, column_info):
|
|
"receive a column_reflect event"
|
|
# ...
|
|
|
|
event.listen(
|
|
Table,
|
|
'column_reflect',
|
|
listen_for_reflect)
|
|
|
|
...or with a specific :class:`.Table` instance using
|
|
the ``listeners`` argument::
|
|
|
|
def listen_for_reflect(inspector, table, column_info):
|
|
"receive a column_reflect event"
|
|
# ...
|
|
|
|
t = Table(
|
|
'sometable',
|
|
autoload=True,
|
|
listeners=[
|
|
('column_reflect', listen_for_reflect)
|
|
])
|
|
|
|
This because the reflection process initiated by ``autoload=True``
|
|
completes within the scope of the constructor for :class:`.Table`.
|
|
|
|
"""
|
|
|
|
|
|
class SchemaEventTarget(object):
|
|
"""Base class for elements that are the targets of :class:`.DDLEvents`
|
|
events.
|
|
|
|
This includes :class:`.SchemaItem` as well as :class:`.SchemaType`.
|
|
|
|
"""
|
|
dispatch = event.dispatcher(DDLEvents)
|
|
|
|
def _set_parent(self, parent):
|
|
"""Associate with this SchemaEvent's parent object."""
|
|
|
|
raise NotImplementedError()
|
|
|
|
def _set_parent_with_dispatch(self, parent):
|
|
self.dispatch.before_parent_attach(self, parent)
|
|
self._set_parent(parent)
|
|
self.dispatch.after_parent_attach(self, parent)
|
|
|
|
|
|
class PoolEvents(event.Events):
|
|
"""Available events for :class:`.Pool`.
|
|
|
|
The methods here define the name of an event as well
|
|
as the names of members that are passed to listener
|
|
functions.
|
|
|
|
e.g.::
|
|
|
|
from sqlalchemy import event
|
|
|
|
def my_on_checkout(dbapi_conn, connection_rec, connection_proxy):
|
|
"handle an on checkout event"
|
|
|
|
event.listen(Pool, 'checkout', my_on_checkout)
|
|
|
|
In addition to accepting the :class:`.Pool` class and
|
|
:class:`.Pool` instances, :class:`.PoolEvents` also accepts
|
|
:class:`.Engine` objects and the :class:`.Engine` class as
|
|
targets, which will be resolved to the ``.pool`` attribute of the
|
|
given engine or the :class:`.Pool` class::
|
|
|
|
engine = create_engine("postgresql://scott:tiger@localhost/test")
|
|
|
|
# will associate with engine.pool
|
|
event.listen(engine, 'checkout', my_on_checkout)
|
|
|
|
"""
|
|
|
|
@classmethod
|
|
def _accept_with(cls, target):
|
|
if isinstance(target, type):
|
|
if issubclass(target, engine.Engine):
|
|
return pool.Pool
|
|
elif issubclass(target, pool.Pool):
|
|
return target
|
|
elif isinstance(target, engine.Engine):
|
|
return target.pool
|
|
else:
|
|
return target
|
|
|
|
def connect(self, dbapi_connection, connection_record):
|
|
"""Called once for each new DB-API connection or Pool's ``creator()``.
|
|
|
|
:param dbapi_con:
|
|
A newly connected raw DB-API connection (not a SQLAlchemy
|
|
``Connection`` wrapper).
|
|
|
|
:param con_record:
|
|
The ``_ConnectionRecord`` that persistently manages the connection
|
|
|
|
"""
|
|
|
|
def first_connect(self, dbapi_connection, connection_record):
|
|
"""Called exactly once for the first DB-API connection.
|
|
|
|
:param dbapi_con:
|
|
A newly connected raw DB-API connection (not a SQLAlchemy
|
|
``Connection`` wrapper).
|
|
|
|
:param con_record:
|
|
The ``_ConnectionRecord`` that persistently manages the connection
|
|
|
|
"""
|
|
|
|
def checkout(self, dbapi_connection, connection_record, connection_proxy):
|
|
"""Called when a connection is retrieved from the Pool.
|
|
|
|
:param dbapi_con:
|
|
A raw DB-API connection
|
|
|
|
:param con_record:
|
|
The ``_ConnectionRecord`` that persistently manages the connection
|
|
|
|
:param con_proxy:
|
|
The ``_ConnectionFairy`` which manages the connection for the span of
|
|
the current checkout.
|
|
|
|
If you raise a :class:`~sqlalchemy.exc.DisconnectionError`, the current
|
|
connection will be disposed and a fresh connection retrieved.
|
|
Processing of all checkout listeners will abort and restart
|
|
using the new connection.
|
|
"""
|
|
|
|
def checkin(self, dbapi_connection, connection_record):
|
|
"""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.)
|
|
|
|
:param dbapi_con:
|
|
A raw DB-API connection
|
|
|
|
:param con_record:
|
|
The ``_ConnectionRecord`` that persistently manages the connection
|
|
|
|
"""
|
|
|
|
def reset(self, dbapi_con, con_record):
|
|
"""Called before the "reset" action occurs for a pooled connection.
|
|
|
|
This event represents
|
|
when the ``rollback()`` method is called on the DBAPI connection
|
|
before it is returned to the pool. The behavior of "reset" can
|
|
be controlled, including disabled, using the ``reset_on_return``
|
|
pool argument.
|
|
|
|
|
|
The :meth:`.PoolEvents.reset` event is usually followed by the
|
|
the :meth:`.PoolEvents.checkin` event is called, except in those
|
|
cases where the connection is discarded immediately after reset.
|
|
|
|
:param dbapi_con:
|
|
A raw DB-API connection
|
|
|
|
:param con_record:
|
|
The ``_ConnectionRecord`` that persistently manages the connection
|
|
|
|
.. versionadded:: 0.8
|
|
|
|
.. seealso::
|
|
|
|
:meth:`.ConnectionEvents.rollback`
|
|
|
|
:meth:`.ConnectionEvents.commit`
|
|
|
|
"""
|
|
|
|
|
|
|
|
class ConnectionEvents(event.Events):
|
|
"""Available events for :class:`.Connectable`, which includes
|
|
:class:`.Connection` and :class:`.Engine`.
|
|
|
|
The methods here define the name of an event as well as the names of
|
|
members that are passed to listener functions.
|
|
|
|
An event listener can be associated with any :class:`.Connectable`
|
|
class or instance, such as an :class:`.Engine`, e.g.::
|
|
|
|
from sqlalchemy import event, create_engine
|
|
|
|
def before_cursor_execute(conn, cursor, statement, parameters, context,
|
|
executemany):
|
|
log.info("Received statement: %s" % statement)
|
|
|
|
engine = create_engine('postgresql://scott:tiger@localhost/test')
|
|
event.listen(engine, "before_cursor_execute", before_cursor_execute)
|
|
|
|
or with a specific :class:`.Connection`::
|
|
|
|
with engine.begin() as conn:
|
|
@event.listens_for(conn, 'before_cursor_execute')
|
|
def before_cursor_execute(conn, cursor, statement, parameters,
|
|
context, executemany):
|
|
log.info("Received statement: %s" % statement)
|
|
|
|
The :meth:`.before_execute` and :meth:`.before_cursor_execute`
|
|
events can also be established with the ``retval=True`` flag, which
|
|
allows modification of the statement and parameters to be sent
|
|
to the database. The :meth:`.before_cursor_execute` event is
|
|
particularly useful here to add ad-hoc string transformations, such
|
|
as comments, to all executions::
|
|
|
|
from sqlalchemy.engine import Engine
|
|
from sqlalchemy import event
|
|
|
|
@event.listens_for(Engine, "before_cursor_execute", retval=True)
|
|
def comment_sql_calls(conn, cursor, statement, parameters,
|
|
context, executemany):
|
|
statement = statement + " -- some comment"
|
|
return statement, parameters
|
|
|
|
.. note:: :class:`.ConnectionEvents` can be established on any
|
|
combination of :class:`.Engine`, :class:`.Connection`, as well
|
|
as instances of each of those classes. Events across all
|
|
four scopes will fire off for a given instance of
|
|
:class:`.Connection`. However, for performance reasons, the
|
|
:class:`.Connection` object determines at instantiation time
|
|
whether or not its parent :class:`.Engine` has event listeners
|
|
established. Event listeners added to the :class:`.Engine`
|
|
class or to an instance of :class:`.Engine` *after* the instantiation
|
|
of a dependent :class:`.Connection` instance will usually
|
|
*not* be available on that :class:`.Connection` instance. The newly
|
|
added listeners will instead take effect for :class:`.Connection`
|
|
instances created subsequent to those event listeners being
|
|
established on the parent :class:`.Engine` class or instance.
|
|
|
|
:param retval=False: Applies to the :meth:`.before_execute` and
|
|
:meth:`.before_cursor_execute` events only. When True, the
|
|
user-defined event function must have a return value, which
|
|
is a tuple of parameters that replace the given statement
|
|
and parameters. See those methods for a description of
|
|
specific return arguments.
|
|
|
|
.. versionchanged:: 0.8 :class:`.ConnectionEvents` can now be associated
|
|
with any :class:`.Connectable` including :class:`.Connection`,
|
|
in addition to the existing support for :class:`.Engine`.
|
|
|
|
"""
|
|
|
|
@classmethod
|
|
def _listen(cls, target, identifier, fn, retval=False):
|
|
target._has_events = True
|
|
|
|
if not retval:
|
|
if identifier == 'before_execute':
|
|
orig_fn = fn
|
|
|
|
def wrap_before_execute(conn, clauseelement,
|
|
multiparams, params):
|
|
orig_fn(conn, clauseelement, multiparams, params)
|
|
return clauseelement, multiparams, params
|
|
fn = wrap_before_execute
|
|
elif identifier == 'before_cursor_execute':
|
|
orig_fn = fn
|
|
|
|
def wrap_before_cursor_execute(conn, cursor, statement,
|
|
parameters, context, executemany):
|
|
orig_fn(conn, cursor, statement,
|
|
parameters, context, executemany)
|
|
return statement, parameters
|
|
fn = wrap_before_cursor_execute
|
|
|
|
elif retval and \
|
|
identifier not in ('before_execute', 'before_cursor_execute'):
|
|
raise exc.ArgumentError(
|
|
"Only the 'before_execute' and "
|
|
"'before_cursor_execute' engine "
|
|
"event listeners accept the 'retval=True' "
|
|
"argument.")
|
|
event.Events._listen(target, identifier, fn)
|
|
|
|
def before_execute(self, conn, clauseelement, multiparams, params):
|
|
"""Intercept high level execute() events, receiving uncompiled
|
|
SQL constructs and other objects prior to rendering into SQL.
|
|
|
|
This event is good for debugging SQL compilation issues as well
|
|
as early manipulation of the parameters being sent to the database,
|
|
as the parameter lists will be in a consistent format here.
|
|
|
|
This event can be optionally established with the ``retval=True``
|
|
flag. The ``clauseelement``, ``multiparams``, and ``params``
|
|
arguments should be returned as a three-tuple in this case::
|
|
|
|
@event.listens_for(Engine, "before_execute", retval=True)
|
|
def before_execute(conn, conn, clauseelement, multiparams, params):
|
|
# do something with clauseelement, multiparams, params
|
|
return clauseelement, multiparams, params
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param clauseelement: SQL expression construct, :class:`.Compiled`
|
|
instance, or string statement passed to :meth:`.Connection.execute`.
|
|
:param multiparams: Multiple parameter sets, a list of dictionaries.
|
|
:param params: Single parameter set, a single dictionary.
|
|
|
|
See also:
|
|
|
|
:meth:`.before_cursor_execute`
|
|
|
|
"""
|
|
|
|
def after_execute(self, conn, clauseelement, multiparams, params, result):
|
|
"""Intercept high level execute() events after execute.
|
|
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param clauseelement: SQL expression construct, :class:`.Compiled`
|
|
instance, or string statement passed to :meth:`.Connection.execute`.
|
|
:param multiparams: Multiple parameter sets, a list of dictionaries.
|
|
:param params: Single parameter set, a single dictionary.
|
|
:param result: :class:`.ResultProxy` generated by the execution.
|
|
|
|
"""
|
|
|
|
def before_cursor_execute(self, conn, cursor, statement,
|
|
parameters, context, executemany):
|
|
"""Intercept low-level cursor execute() events before execution,
|
|
receiving the string
|
|
SQL statement and DBAPI-specific parameter list to be invoked
|
|
against a cursor.
|
|
|
|
This event is a good choice for logging as well as late modifications
|
|
to the SQL string. It's less ideal for parameter modifications except
|
|
for those which are specific to a target backend.
|
|
|
|
This event can be optionally established with the ``retval=True``
|
|
flag. The ``statement`` and ``parameters`` arguments should be
|
|
returned as a two-tuple in this case::
|
|
|
|
@event.listens_for(Engine, "before_cursor_execute", retval=True)
|
|
def before_cursor_execute(conn, cursor, statement,
|
|
parameters, context, executemany):
|
|
# do something with statement, parameters
|
|
return statement, parameters
|
|
|
|
See the example at :class:`.ConnectionEvents`.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param cursor: DBAPI cursor object
|
|
:param statement: string SQL statement
|
|
:param parameters: Dictionary, tuple, or list of parameters being
|
|
passed to the ``execute()`` or ``executemany()`` method of the
|
|
DBAPI ``cursor``. In some cases may be ``None``.
|
|
:param context: :class:`.ExecutionContext` object in use. May
|
|
be ``None``.
|
|
:param executemany: boolean, if ``True``, this is an ``executemany()``
|
|
call, if ``False``, this is an ``execute()`` call.
|
|
|
|
See also:
|
|
|
|
:meth:`.before_execute`
|
|
|
|
:meth:`.after_cursor_execute`
|
|
|
|
"""
|
|
|
|
def after_cursor_execute(self, conn, cursor, statement,
|
|
parameters, context, executemany):
|
|
"""Intercept low-level cursor execute() events after execution.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param cursor: DBAPI cursor object. Will have results pending
|
|
if the statement was a SELECT, but these should not be consumed
|
|
as they will be needed by the :class:`.ResultProxy`.
|
|
:param statement: string SQL statement
|
|
:param parameters: Dictionary, tuple, or list of parameters being
|
|
passed to the ``execute()`` or ``executemany()`` method of the
|
|
DBAPI ``cursor``. In some cases may be ``None``.
|
|
:param context: :class:`.ExecutionContext` object in use. May
|
|
be ``None``.
|
|
:param executemany: boolean, if ``True``, this is an ``executemany()``
|
|
call, if ``False``, this is an ``execute()`` call.
|
|
|
|
"""
|
|
|
|
def dbapi_error(self, conn, cursor, statement, parameters,
|
|
context, exception):
|
|
"""Intercept a raw DBAPI error.
|
|
|
|
This event is called with the DBAPI exception instance
|
|
received from the DBAPI itself, *before* SQLAlchemy wraps the
|
|
exception with it's own exception wrappers, and before any
|
|
other operations are performed on the DBAPI cursor; the
|
|
existing transaction remains in effect as well as any state
|
|
on the cursor.
|
|
|
|
The use case here is to inject low-level exception handling
|
|
into an :class:`.Engine`, typically for logging and
|
|
debugging purposes. In general, user code should **not** modify
|
|
any state or throw any exceptions here as this will
|
|
interfere with SQLAlchemy's cleanup and error handling
|
|
routines.
|
|
|
|
Subsequent to this hook, SQLAlchemy may attempt any
|
|
number of operations on the connection/cursor, including
|
|
closing the cursor, rolling back of the transaction in the
|
|
case of connectionless execution, and disposing of the entire
|
|
connection pool if a "disconnect" was detected. The
|
|
exception is then wrapped in a SQLAlchemy DBAPI exception
|
|
wrapper and re-thrown.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param cursor: DBAPI cursor object
|
|
:param statement: string SQL statement
|
|
:param parameters: Dictionary, tuple, or list of parameters being
|
|
passed to the ``execute()`` or ``executemany()`` method of the
|
|
DBAPI ``cursor``. In some cases may be ``None``.
|
|
:param context: :class:`.ExecutionContext` object in use. May
|
|
be ``None``.
|
|
:param exception: The **unwrapped** exception emitted directly from the
|
|
DBAPI. The class here is specific to the DBAPI module in use.
|
|
|
|
.. versionadded:: 0.7.7
|
|
|
|
"""
|
|
|
|
def begin(self, conn):
|
|
"""Intercept begin() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
|
|
"""
|
|
|
|
def rollback(self, conn):
|
|
"""Intercept rollback() events, as initiated by a
|
|
:class:`.Transaction`.
|
|
|
|
Note that the :class:`.Pool` also "auto-rolls back"
|
|
a DBAPI connection upon checkin, if the ``reset_on_return``
|
|
flag is set to its default value of ``'rollback'``.
|
|
To intercept this
|
|
rollback, use the :meth:`.PoolEvents.reset` hook.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
|
|
.. seealso::
|
|
|
|
:meth:`.PoolEvents.reset`
|
|
|
|
"""
|
|
|
|
def commit(self, conn):
|
|
"""Intercept commit() events, as initiated by a
|
|
:class:`.Transaction`.
|
|
|
|
Note that the :class:`.Pool` may also "auto-commit"
|
|
a DBAPI connection upon checkin, if the ``reset_on_return``
|
|
flag is set to the value ``'commit'``. To intercept this
|
|
commit, use the :meth:`.PoolEvents.reset` hook.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
"""
|
|
|
|
def savepoint(self, conn, name=None):
|
|
"""Intercept savepoint() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param name: specified name used for the savepoint.
|
|
|
|
"""
|
|
|
|
def rollback_savepoint(self, conn, name, context):
|
|
"""Intercept rollback_savepoint() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param name: specified name used for the savepoint.
|
|
:param context: :class:`.ExecutionContext` in use. May be ``None``.
|
|
|
|
"""
|
|
|
|
def release_savepoint(self, conn, name, context):
|
|
"""Intercept release_savepoint() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param name: specified name used for the savepoint.
|
|
:param context: :class:`.ExecutionContext` in use. May be ``None``.
|
|
|
|
"""
|
|
|
|
def begin_twophase(self, conn, xid):
|
|
"""Intercept begin_twophase() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param xid: two-phase XID identifier
|
|
|
|
"""
|
|
|
|
def prepare_twophase(self, conn, xid):
|
|
"""Intercept prepare_twophase() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param xid: two-phase XID identifier
|
|
"""
|
|
|
|
def rollback_twophase(self, conn, xid, is_prepared):
|
|
"""Intercept rollback_twophase() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param xid: two-phase XID identifier
|
|
:param is_prepared: boolean, indicates if
|
|
:meth:`.TwoPhaseTransaction.prepare` was called.
|
|
|
|
"""
|
|
|
|
def commit_twophase(self, conn, xid, is_prepared):
|
|
"""Intercept commit_twophase() events.
|
|
|
|
:param conn: :class:`.Connection` object
|
|
:param xid: two-phase XID identifier
|
|
:param is_prepared: boolean, indicates if
|
|
:meth:`.TwoPhaseTransaction.prepare` was called.
|
|
|
|
"""
|