mirror of
https://github.com/hwchase17/langchain
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41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
"""Vector SQL Database Chain Retriever"""
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from typing import Any, Dict, List
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from langchain.callbacks.manager import (
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AsyncCallbackManagerForRetrieverRun,
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CallbackManagerForRetrieverRun,
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)
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from langchain_core.documents import Document
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from langchain_core.retrievers import BaseRetriever
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from langchain_experimental.sql.vector_sql import VectorSQLDatabaseChain
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class VectorSQLDatabaseChainRetriever(BaseRetriever):
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"""Retriever that uses Vector SQL Database."""
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sql_db_chain: VectorSQLDatabaseChain
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"""SQL Database Chain"""
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page_content_key: str = "content"
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"""column name for page content of documents"""
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def _get_relevant_documents(
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self,
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query: str,
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*,
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run_manager: CallbackManagerForRetrieverRun,
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**kwargs: Any,
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) -> List[Document]:
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ret: List[Dict[str, Any]] = self.sql_db_chain(
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query, callbacks=run_manager.get_child(), **kwargs
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)["result"]
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return [
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Document(page_content=r[self.page_content_key], metadata=r) for r in ret
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]
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async def _aget_relevant_documents(
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self, query: str, *, run_manager: AsyncCallbackManagerForRetrieverRun
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) -> List[Document]:
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raise NotImplementedError
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