delta/python-packages/sqlalchemy.git/lib/sqlalchemy/engine/strategies.py, branch pr/230

- reorganize schema_translate_map to be succinct and gain the performance

2016-01-11T21:44:28+00:00

back by using an attrgetter for the default case

- Multi-tenancy schema translation for :class:`.Table` objects is added.

2016-01-09T03:12:25+00:00

This supports the use case of an application that uses the same set of
:class:`.Table` objects in many schemas, such as schema-per-user.
A new execution option
:paramref:`.Connection.execution_options.schema_translate_map` is
added. fixes #2685
- latest tox doesn't like the {posargs} in the profile rerunner

- Added a new entrypoint system to the engine to allow "plugins" to

2016-01-06T22:20:57+00:00

be stated in the query string for a URL.   Custom plugins can
be written which will be given the chance up front to alter and/or
consume the engine's URL and keyword arguments, and then at engine
create time will be given the engine itself to allow additional
modifications or event registration.  Plugins are written as a
subclass of :class:`.CreateEnginePlugin`; see that class for
details.
fixes #3536

- fix some tests related to the URL change and try to make

2015-05-23T13:07:36+00:00

the URL design a little simpler

- Adjustments to the engine plugin hook, such that the

2015-05-22T17:51:00+00:00

:meth:`.URL.get_dialect` method will continue to return the
ultimate :class:`.Dialect` object when a dialect plugin is used,
without the need for the caller to be aware of the
:meth:`.Dialect.get_dialect_cls` method.
reference #3379

- New features added to support engine/pool plugins with advanced

2015-04-30T21:51:14+00:00

functionality.   Added a new "soft invalidate" feature to the
connection pool at the level of the checked out connection wrapper
as well as the :class:`._ConnectionRecord`.  This works similarly
to a modern pool invalidation in that connections aren't actively
closed, but are recycled only on next checkout; this is essentially
a per-connection version of that feature.  A new event
:class:`.PoolEvents.soft_invalidate` is added to complement it.
fixes #3379

- Added new flag
:attr:`.ExceptionContext.invalidate_pool_on_disconnect`.
Allows an error handler within :meth:`.ConnectionEvents.handle_error`
to maintain a "disconnect" condition, but to handle calling invalidate
on individual connections in a specific manner within the event.

- Added new event :class:`.DialectEvents.do_connect`, which allows
interception / replacement of when the :meth:`.Dialect.connect`
hook is called to create a DBAPI connection.  Also added
dialect plugin hooks :meth:`.Dialect.get_dialect_cls` and
:meth:`.Dialect.engine_created` which allow external plugins to
add events to existing dialects using entry points.
fixes #3355

- copyright 2015

2015-03-10T19:24:28+00:00

- The engine-level error handling and wrapping routines will now

2014-12-05T17:12:44+00:00

take effect in all engine connection use cases, including
when user-custom connect routines are used via the
:paramref:`.create_engine.creator` parameter, as well as when
the :class:`.Connection` encounters a connection error on
revalidation.
fixes #3266

- adjustment for ref #3200 as we need an immutabledict() here so

2014-10-07T16:43:27+00:00

that union() can be called, in the case of a dialect that uses
execution options inside of initialize() (e.g. oursql)

- The execution options passed to an :class:`.Engine` either via

2014-10-06T22:23:42+00:00

:paramref:`.create_engine.execution_options` or
:meth:`.Engine.update_execution_options` are not passed to the
special :class:`.Connection` used to initialize the dialect
within the "first connect" event; dialects will usually
perform their own queries in this phase, and none of the
current available  options should be applied here.  In
particular, the "autocommit" option was causing an attempt to
autocommit within this initial connect which would fail with
an AttributeError due to the non-standard state of the
:class:`.Connection`.
fixes #3200