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db.py
53 lines (45 loc) · 1.71 KB
/
db.py
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from typing import Any, Dict, List
from cassandra.cluster import Cluster
from cassandra.query import SimpleStatement
keyspace = "colbert"
class DB:
def __init__(self, **kwargs):
self.cluster = Cluster(**kwargs)
self.session = self.cluster.connect()
self.session.default_timeout = 60
insert_chunk_cql = f"""
INSERT INTO {keyspace}.chunks (title, part, body, ada002_embedding)
VALUES (?, ?, ?, ?)
"""
self.insert_chunk_stmt = self.session.prepare(insert_chunk_cql)
insert_colbert_cql = f"""
INSERT INTO {keyspace}.colbert_embeddings (title, part, embedding_id, bert_embedding)
VALUES (?, ?, ?, ?)
"""
self.insert_colbert_stmt = self.session.prepare(insert_colbert_cql)
query_ada_cql = f"""
SELECT title, body
FROM {keyspace}.chunks
ORDER BY ada002_embedding ANN OF ?
LIMIT ?
"""
self.query_ada_stmt = self.session.prepare(query_ada_cql)
query_colbert_ann_cql = f"""
SELECT title, part, bert_embedding
FROM {keyspace}.colbert_embeddings
ORDER BY bert_embedding ANN OF ?
LIMIT ?
"""
self.query_colbert_ann_stmt = self.session.prepare(query_colbert_ann_cql)
query_colbert_parts_cql = f"""
SELECT title, part, bert_embedding
FROM {keyspace}.colbert_embeddings
WHERE title = ? AND part = ?
"""
self.query_colbert_parts_stmt = self.session.prepare(query_colbert_parts_cql)
query_part_by_pk = f"""
SELECT body
FROM {keyspace}.chunks
WHERE title = ? AND part = ?
"""
self.query_part_by_pk_stmt = self.session.prepare(query_part_by_pk)