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* SelectBase no longer a FromClauseMike Bayer2019-07-061-0/+103
| | | | | | | | | | | | | | | | | | | | As part of the SQLAlchemy 2.0 migration project, a conceptual change has been made to the role of the :class:`.SelectBase` class hierarchy, which is the root of all "SELECT" statement constructs, in that they no longer serve directly as FROM clauses, that is, they no longer subclass :class:`.FromClause`. For end users, the change mostly means that any placement of a :func:`.select` construct in the FROM clause of another :func:`.select` requires first that it be wrapped in a subquery first, which historically is through the use of the :meth:`.SelectBase.alias` method, and is now also available through the use of :meth:`.SelectBase.subquery`. This was usually a requirement in any case since several databases don't accept unnamed SELECT subqueries in their FROM clause in any case. See the documentation in this change for lots more detail. Fixes: #4617 Change-Id: I0f6174ee24b9a1a4529168e52e855e12abd60667
* Prevent __init__ from being called for Alias, subclassesMike Bayer2019-02-211-0/+16
| | | | | | | | | | | The :class:`.Alias` class and related subclasses :class:`.CTE`, :class:`.Lateral` and :class:`.TableSample` have been reworked so that it is not possible for a user to construct the objects directly. These constructs require that the standalone construction function or selectable-bound method be used to instantiate new objects. Fixes: #4509 Change-Id: I74ae4786cb3ae625dab33b00bfd6bdc4e1219139
* Post black reformattingMike Bayer2019-01-061-6/+12
| | | | | | | | | | | | | Applied on top of a pure run of black -l 79 in I7eda77fed3d8e73df84b3651fd6cfcfe858d4dc9, this set of changes resolves all remaining flake8 conditions for those codes we have enabled in setup.cfg. Included are resolutions for all remaining flake8 issues including shadowed builtins, long lines, import order, unused imports, duplicate imports, and docstring issues. Change-Id: I4f72d3ba1380dd601610ff80b8fb06a2aff8b0fe
* Run black -l 79 against all source filesMike Bayer2019-01-061-34/+49
| | | | | | | | | | | | | | This is a straight reformat run using black as is, with no edits applied at all. The black run will format code consistently, however in some cases that are prevalent in SQLAlchemy code it produces too-long lines. The too-long lines will be resolved in the following commit that will resolve all remaining flake8 issues including shadowed builtins, long lines, import order, unused imports, duplicate imports, and docstring issues. Change-Id: I7eda77fed3d8e73df84b3651fd6cfcfe858d4dc9
* Make all tests to be PEP8 compliantKhairi Hafsham2017-02-071-3/+0
| | | | | | | | tested using pycodestyle version 2.2.0 Fixes: #3885 Change-Id: I5df43adc3aefe318f9eeab72a078247a548ec566 Pull-request: https://github.com/zzzeek/sqlalchemy/pull/343
* - Added :meth:`.Select.lateral` and related constructs to allowMike Bayer2016-03-291-0/+134
for the SQL standard LATERAL keyword, currently only supported by Postgresql. fixes #2857