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From ran-z <...@git.apache.org>
Subject [GitHub] incubator-ariatosca pull request #31: ARIA-30-SQL-based-storage-implementati...
Date Sun, 04 Dec 2016 13:18:34 GMT
Github user ran-z commented on a diff in the pull request:

    https://github.com/apache/incubator-ariatosca/pull/31#discussion_r90774304
  
    --- Diff: aria/storage/sql_mapi.py ---
    @@ -0,0 +1,361 @@
    +# Licensed to the Apache Software Foundation (ASF) under one or more
    +# contributor license agreements.  See the NOTICE file distributed with
    +# this work for additional information regarding copyright ownership.
    +# The ASF licenses this file to You 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.
    +"""
    +SQLAlchemy based MAPI
    +"""
    +
    +from sqlalchemy.exc import SQLAlchemyError
    +from sqlalchemy.sql.elements import Label
    +
    +from aria.utils.collections import OrderedDict
    +
    +from aria.storage import (
    +    api,
    +    exceptions
    +)
    +
    +
    +DEFAULT_SQL_DIALECT = 'sqlite'
    +
    +
    +class SQLAlchemyModelAPI(api.ModelAPI):
    +    """
    +    SQL based MAPI.
    +    """
    +
    +    def __init__(self,
    +                 engine,
    +                 session,
    +                 **kwargs):
    +        super(SQLAlchemyModelAPI, self).__init__(**kwargs)
    +        self._engine = engine
    +        self._session = session
    +
    +    def get(self, entry_id, include=None, filters=None, locking=False, **kwargs):
    +        """Return a single result based on the model class and element ID
    +        """
    +        filters = filters or {'id': entry_id}
    +        query = self._get_query(include, filters)
    +        if locking:
    +            query = query.with_for_update()
    +        result = query.first()
    +
    +        if not result:
    +            raise exceptions.StorageError(
    +                'Requested {0} with ID `{1}` was not found'
    +                .format(self.model_cls.__name__, entry_id)
    +            )
    +        return result
    +
    +    def iter(self,
    +             include=None,
    +             filters=None,
    +             pagination=None,
    +             sort=None,
    +             **kwargs):
    +        """Return a (possibly empty) list of `model_class` results
    +        """
    +        query = self._get_query(include, filters, sort)
    +
    +        results, _, _, _ = self._paginate(query, pagination)
    +
    +        for result in results:
    +            yield result
    +
    +    def put(self, entry, **kwargs):
    +        """Create a `model_class` instance from a serializable `model` object
    +
    +        :param entry: A dict with relevant kwargs, or an instance of a class
    +        that has a `to_dict` method, and whose attributes match the columns
    +        of `model_class` (might also my just an instance of `model_class`)
    +        :return: An instance of `model_class`
    +        """
    +        self._session.add(entry)
    +        self._safe_commit()
    +        return entry
    +
    +    def delete(self, entry_id, filters=None, **kwargs):
    --- End diff --
    
    get entry not entry_id


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