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# dialects/__init__.py
# Copyright (C) 2005-2025 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: https://www.opensource.org/licenses/mit-license.php
from __future__ import annotations
from typing import Callable
from typing import Optional
from typing import Type
from typing import TYPE_CHECKING
from .. import util
if TYPE_CHECKING:
from ..engine.interfaces import Dialect
__all__ = ("mssql", "mysql", "oracle", "postgresql", "sqlite")
def _auto_fn(name: str) -> Optional[Callable[[], Type[Dialect]]]:
"""default dialect importer.
plugs into the :class:`.PluginLoader`
as a first-hit system.
"""
if "." in name:
dialect, driver = name.split(".")
else:
dialect = name
driver = "base"
try:
if dialect == "mariadb":
# it's "OK" for us to hardcode here since _auto_fn is already
# hardcoded. if mysql / mariadb etc were third party dialects
# they would just publish all the entrypoints, which would actually
# look much nicer.
module = __import__(
"sqlalchemy.dialects.mysql.mariadb"
).dialects.mysql.mariadb
return module.loader(driver) # type: ignore
else:
module = __import__("sqlalchemy.dialects.%s" % (dialect,)).dialects
module = getattr(module, dialect)
except ImportError:
return None
if hasattr(module, driver):
module = getattr(module, driver)
return lambda: module.dialect
else:
return None
registry = util.PluginLoader("sqlalchemy.dialects", auto_fn=_auto_fn)
plugins = util.PluginLoader("sqlalchemy.plugins")