Langchain+chain+数据库操作 - AI创想

import os
from operator import itemgetter
import bs4
from langchain.chains.combine_documents import create_stuff_documents_chain
from langchain.chains.history_aware_retriever import create_history_aware_retriever
from langchain.chains.retrieval import create_retrieval_chain
from langchain.chains.sql_database.query import create_sql_query_chain
from langchain_chroma import Chroma
from langchain_community.document_loaders import WebBaseLoader
from langchain_community.tools import QuerySQLDataBaseTool
from langchain_community.utilities import SQLDatabase
from langchain_core.output_parsers import StrOutputParser
from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder, PromptTemplate
from langchain_core.runnables import RunnableWithMessageHistory, RunnablePassthrough
from langchain_text_splitters import RecursiveCharacterTextSplitter
from langchain_community.chat_message_histories import ChatMessageHistory
from langchain_openai import ChatOpenAI, OpenAIEmbeddings
os.environ['http_proxy'] = '127.0.0.1:7890'
os.environ['https_proxy'] = '127.0.0.1:7890'
os.environ["LANGCHAIN_TRACING_V2"] = "true"
os.environ["LANGCHAIN_PROJECT"] = "LangchainDemo"
os.envi

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