Initial Fork from https://bitbucket.org/raphaelmutschler/calibreserver/

lib/sqlalchemy/dialects/__init__.py

@@ -0,0 +1,45 @@
+# dialects/__init__.py
+# Copyright (C) 2005-2013 the SQLAlchemy authors and contributors <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: http://www.opensource.org/licenses/mit-license.php
+
+__all__ = (
+    'drizzle',
+    'firebird',
+#    'informix',
+    'mssql',
+    'mysql',
+    'oracle',
+    'postgresql',
+    'sqlite',
+    'sybase',
+    )
+
+from .. import util
+
+def _auto_fn(name):
+    """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:
+        module = __import__('sqlalchemy.dialects.%s' % (dialect, )).dialects
+    except ImportError:
+        return None
+
+    module = getattr(module, dialect)
+    if hasattr(module, driver):
+        module = getattr(module, driver)
+        return lambda: module.dialect
+    else:
+        return None
+
+registry = util.PluginLoader("sqlalchemy.dialects", auto_fn=_auto_fn)