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==============
1.0 Changelog
==============
.. changelog_imports::
.. include:: changelog_09.rst
:start-line: 5
.. include:: changelog_08.rst
:start-line: 5
.. include:: changelog_07.rst
:start-line: 5
.. changelog::
:version: 1.0.0
.. change::
:tags: removed
The Drizzle dialect has been removed from the Core; it is now
available as `sqlalchemy-drizzle <https://bitbucket.org/zzzeek/sqlalchemy-drizzle>`_,
an independent, third party dialect. The dialect is still based
almost entirely off of the MySQL dialect present in SQLAlchemy.
.. seealso::
:ref:`change_2984`
.. change::
:tags: enhancement, orm
:tickets: 3061
Adjustment to attribute mechanics concerning when a value is
implicitly initialized to None via first access; this action,
which has always resulted in a population of the attribute,
no longer does so; the None value is returned but the underlying
attribute receives no set event. This is consistent with how collections
work and allows attribute mechanics to behave more consistently;
in particular, getting an attribute with no value does not squash
the event that should proceed if the value is actually set to None.
.. seealso::
:ref:`migration_3061`
.. change::
:tags: feature, sql
:tickets: 3034
The :meth:`.Select.limit` and :meth:`.Select.offset` methods
now accept any SQL expression, in addition to integer values, as
arguments. Typically this is used to allow a bound parameter to be
passed, which can be substituted with a value later thus allowing
Python-side caching of the SQL query. The implementation
here is fully backwards compatible with existing third party dialects,
however those dialects which implement special LIMIT/OFFSET systems
will need modification in order to take advantage of the new
capabilities. Work on this feature is courtesy of Dobes Vandermeer.
.. seealso::
:ref:`feature_3034`.
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