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62 lines
1.7 KiB
62 lines
1.7 KiB
1 year ago
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# dialects/__init__.py
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# Copyright (C) 2005-2023 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: https://www.opensource.org/licenses/mit-license.php
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from __future__ import annotations
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from typing import Callable
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from typing import Optional
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from typing import Type
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from typing import TYPE_CHECKING
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from .. import util
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if TYPE_CHECKING:
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from ..engine.interfaces import Dialect
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__all__ = ("mssql", "mysql", "oracle", "postgresql", "sqlite")
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def _auto_fn(name: str) -> Optional[Callable[[], Type[Dialect]]]:
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"""default dialect importer.
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plugs into the :class:`.PluginLoader`
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as a first-hit system.
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"""
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if "." in name:
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dialect, driver = name.split(".")
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else:
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dialect = name
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driver = "base"
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try:
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if dialect == "mariadb":
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# it's "OK" for us to hardcode here since _auto_fn is already
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# hardcoded. if mysql / mariadb etc were third party dialects
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# they would just publish all the entrypoints, which would actually
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# look much nicer.
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module = __import__(
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"sqlalchemy.dialects.mysql.mariadb"
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).dialects.mysql.mariadb
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return module.loader(driver) # type: ignore
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else:
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module = __import__("sqlalchemy.dialects.%s" % (dialect,)).dialects
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module = getattr(module, dialect)
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except ImportError:
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return None
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if hasattr(module, driver):
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module = getattr(module, driver)
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return lambda: module.dialect # type: ignore
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else:
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return None
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registry = util.PluginLoader("sqlalchemy.dialects", auto_fn=_auto_fn)
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plugins = util.PluginLoader("sqlalchemy.plugins")
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