Import sqlalchemy session/models/utils

Bring in session, base model, utilities, and tests for sqlalchemy
from Nova.

Add sqlalchemy to pip-requires and and python-mysql to test-requires.

Partially implements blueprint common-db

Change-Id: I3e0065cdac87e10c4e0742d66c293c72bb3acbb2

1 files changed, 44 insertions, 0 deletions

diff --git a/db/common.py b/db/common.py
new file mode 100644
index 0000000..8f6968f
--- /dev/null
+++ b/db/common.py
@@ -0,0 +1,44 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2010 United States Government as represented by the
+# Administrator of the National Aeronautics and Space Administration.
+# All Rights Reserved.
+# Copyright 2012 Cloudscaling Group, Inc
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from openstack.common.gettextutils import _
+from openstack.common import log as logging
+
+
+LOG = logging.getLogger(__name__)
+
+
+class Invalid(Exception):
+        pass
+
+
+class InvalidSortKey(Invalid):
+    message = _("Sort key supplied was not valid.")
+
+
+class InvalidUnicodeParameter(Invalid):
+    message = _("Invalid Parameter: "
+                "Unicode is not supported by the current database.")
+
+
+class DBError(Exception):
+    """Wraps an implementation specific exception."""
+    def __init__(self, inner_exception=None):
+        self.inner_exception = inner_exception
+        super(DBError, self).__init__(str(inner_exception))