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Diffstat (limited to 'lib/sqlalchemy/ext/compiler.py')
| -rw-r--r-- | lib/sqlalchemy/ext/compiler.py | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/lib/sqlalchemy/ext/compiler.py b/lib/sqlalchemy/ext/compiler.py index b8265e88e..b74761fe4 100644 --- a/lib/sqlalchemy/ext/compiler.py +++ b/lib/sqlalchemy/ext/compiler.py @@ -229,18 +229,19 @@ A synopsis is as follows: raise TypeError("coalesce only supports two arguments on Oracle") return "nvl(%s)" % compiler.process(element.clauses, **kw) -* :class:`.DDLElement` - The root of all DDL expressions, - like CREATE TABLE, ALTER TABLE, etc. Compilation of :class:`.DDLElement` - subclasses is issued by a :class:`.DDLCompiler` instead of a - :class:`.SQLCompiler`. :class:`.DDLElement` can also be used as an event hook - in conjunction with event hooks like :meth:`.DDLEvents.before_create` and +* :class:`.ExecutableDDLElement` - The root of all DDL expressions, + like CREATE TABLE, ALTER TABLE, etc. Compilation of + :class:`.ExecutableDDLElement` subclasses is issued by a + :class:`.DDLCompiler` instead of a :class:`.SQLCompiler`. + :class:`.ExecutableDDLElement` can also be used as an event hook in + conjunction with event hooks like :meth:`.DDLEvents.before_create` and :meth:`.DDLEvents.after_create`, allowing the construct to be invoked automatically during CREATE TABLE and DROP TABLE sequences. .. seealso:: :ref:`metadata_ddl_toplevel` - contains examples of associating - :class:`.DDL` objects (which are themselves :class:`.DDLElement` + :class:`.DDL` objects (which are themselves :class:`.ExecutableDDLElement` instances) with :class:`.DDLEvents` event hooks. * :class:`~sqlalchemy.sql.expression.Executable` - This is a mixin which |