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db.py
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db.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2024 DataStax
#
# 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.
#
from cassandra.cluster import Cluster
keyspace = "wikidata"
class DB:
def __init__(self, **kwargs):
self.cluster = Cluster(**kwargs)
self.session = self.cluster.connect()
self.session.default_timeout = 60
query_minilm_cql = f"""
SELECT title, chunk_no, body
FROM {keyspace}.articles
ORDER BY all_minilm_l6_v2_embedding ANN OF ?
LIMIT 5
"""
self.query_minilm_stmt = self.session.prepare(query_minilm_cql)
query_colbert_ann_cql = f"""
SELECT title, chunk_no, bert_embedding
FROM {keyspace}.articles
ORDER BY bert_embedding ANN OF ?
LIMIT 5
"""
self.query_colbert_ann_stmt = self.session.prepare(query_colbert_ann_cql)
query_part_by_pk = f"""
SELECT body
FROM {keyspace}.articles
WHERE wiki = 'simplewiki' and language = 'en' and title = ? AND chunk_no = ? AND bert_embedding_no = -1
"""
self.query_part_by_pk_stmt = self.session.prepare(query_part_by_pk)