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| author | Mike Bayer <mike_mp@zzzcomputing.com> | 2019-04-29 23:26:36 -0400 |
|---|---|---|
| committer | Mike Bayer <mike_mp@zzzcomputing.com> | 2019-05-18 17:46:10 -0400 |
| commit | f07e050c9ce4afdeb9c0c136dbcc547f7e5ac7b8 (patch) | |
| tree | 1b3cd7409ae2eddef635960126551d74f469acc1 /lib/sqlalchemy/sql/ddl.py | |
| parent | 614dfb5f5b5a2427d5d6ce0bc5f34bf0581bf698 (diff) | |
| download | sqlalchemy-f07e050c9ce4afdeb9c0c136dbcc547f7e5ac7b8.tar.gz | |
Implement new ClauseElement role and coercion system
A major refactoring of all the functions handle all detection of
Core argument types as well as perform coercions into a new class hierarchy
based on "roles", each of which identify a syntactical location within a
SQL statement. In contrast to the ClauseElement hierarchy that identifies
"what" each object is syntactically, the SQLRole hierarchy identifies
the "where does it go" of each object syntactically. From this we define
a consistent type checking and coercion system that establishes well
defined behviors.
This is a breakout of the patch that is reorganizing select()
constructs to no longer be in the FromClause hierarchy.
Also includes a rename of as_scalar() into scalar_subquery(); deprecates
automatic coercion to scalar_subquery().
Partially-fixes: #4617
Change-Id: I26f1e78898693c6b99ef7ea2f4e7dfd0e8e1a1bd
Diffstat (limited to 'lib/sqlalchemy/sql/ddl.py')
| -rw-r--r-- | lib/sqlalchemy/sql/ddl.py | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/sqlalchemy/sql/ddl.py b/lib/sqlalchemy/sql/ddl.py index d87a6a1b0..ff36a68e4 100644 --- a/lib/sqlalchemy/sql/ddl.py +++ b/lib/sqlalchemy/sql/ddl.py @@ -10,6 +10,7 @@ to invoke them for a create/drop call. """ +from . import roles from .base import _bind_or_error from .base import _generative from .base import Executable @@ -29,7 +30,7 @@ class _DDLCompiles(ClauseElement): return dialect.ddl_compiler(dialect, self, **kw) -class DDLElement(Executable, _DDLCompiles): +class DDLElement(roles.DDLRole, Executable, _DDLCompiles): """Base class for DDL expression constructs. This class is the base for the general purpose :class:`.DDL` class, |