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| author | Mike Bayer <mike_mp@zzzcomputing.com> | 2019-06-13 12:37:22 -0400 |
|---|---|---|
| committer | Mike Bayer <mike_mp@zzzcomputing.com> | 2019-07-06 13:02:22 -0400 |
| commit | ef7ff058eb67d73ebeac7b125ab2a7806e14629c (patch) | |
| tree | 9a09162961f7bcdb6d16837adacabb99f10b4410 /lib/sqlalchemy/sql/__init__.py | |
| parent | 1ce98ca83a4b2da12e52aa0f4ab181c83063abc2 (diff) | |
| download | sqlalchemy-ef7ff058eb67d73ebeac7b125ab2a7806e14629c.tar.gz | |
SelectBase no longer a FromClause
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
Diffstat (limited to 'lib/sqlalchemy/sql/__init__.py')
| -rw-r--r-- | lib/sqlalchemy/sql/__init__.py | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/sqlalchemy/sql/__init__.py b/lib/sqlalchemy/sql/__init__.py index 00cafd8ff..bf5468aa5 100644 --- a/lib/sqlalchemy/sql/__init__.py +++ b/lib/sqlalchemy/sql/__init__.py @@ -58,6 +58,7 @@ from .expression import quoted_name # noqa from .expression import Select # noqa from .expression import select # noqa from .expression import Selectable # noqa +from .expression import Subquery # noqa from .expression import subquery # noqa from .expression import table # noqa from .expression import TableClause # noqa |