{"id":93086,"date":"2026-08-11T21:17:23","date_gmt":"2026-08-11T13:17:23","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/93086.html"},"modified":"2026-08-11T21:17:23","modified_gmt":"2026-08-11T13:17:23","slug":"fastapi-langchain-agent-rag%ef%bc%9a%e6%89%93%e9%80%a0%e5%85%b1%e4%ba%ab%e5%8a%9e%e5%85%ac%e6%99%ba%e8%83%bd%e5%8a%a9%e6%89%8b%ef%bc%88%e5%88%b6%e5%ba%a6%e9%97%ae%e7%ad%94-%e5%b7%a5%e4%bd%8d","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/93086.html","title":{"rendered":"FastAPI + LangChain Agent + RAG\uff1a\u6253\u9020\u5171\u4eab\u529e\u516c\u667a\u80fd\u52a9\u624b\uff08\u5236\u5ea6\u95ee\u7b54 \/ \u5de5\u4f4d\u67e5\u8be2 \/ \u53c2\u89c2\u9884\u7ea6\uff09"},"content":{"rendered":"

\u4e00\u3001\u9879\u76ee\u80cc\u666f<\/h3>\n
  • \u628a\u300a\u5171\u4eab\u529e\u516c\u5165\u9a7b\u624b\u518c.md\u300b\u505a\u6210 RAG \u77e5\u8bc6\u5e93，\u5236\u5ea6\u95ee\u9898\u7531 AI \u4f9d\u636e\u624b\u518c\u56de\u7b54；<\/li>\n
  • \u628a\u5de5\u4f4d\u6570\u636e\u3001\u53c2\u89c2\u9884\u7ea6\u6302\u6210 Agent \u7684 Tool，\u8ba9 AI \u80fd\u67e5\u7a7a\u95f2\u5de5\u4f4d\u3001\u80fd\u5e2e\u5fd9\u7ea6\u53c2\u89c2；<\/li>\n

    \u4e8c\u3001\u6570\u636e\u6a21\u578b：\u4f1a\u5458 + \u5de5\u4f4d<\/h3>\n

    app\/models\/gongwei.py \u5b9a\u4e49\u4e86\u4e24\u5f20\u8868：<\/p>\n

    from<\/span> tortoise import<\/span> models,<\/span> fields<\/p>\n

    # \u4f1a\u5458\u8868<\/span>
    \nclass<\/span> member<\/span>(<\/span>models.<\/span>Model)<\/span>:<\/span>
    \n id<\/span> =<\/span> fields.<\/span>IntField(<\/span>pk=<\/span>True<\/span>,<\/span> auto_increment=<\/span>True<\/span>)<\/span>
    \n name =<\/span> fields.<\/span>CharField(<\/span>max_length=<\/span>20<\/span>)<\/span> # \u59d3\u540d<\/span>
    \n phone =<\/span> fields.<\/span>CharField(<\/span>max_length=<\/span>11<\/span>)<\/span> # \u624b\u673a\u53f7<\/span>
    \n is_delete =<\/span> fields.<\/span>IntField(<\/span>default=<\/span>0<\/span>)<\/span> # \u903b\u8f91\u5220\u9664<\/span><\/p>\n

    class<\/span> Meta<\/span>:<\/span>
    \n table =<\/span> 'member'<\/span><\/p>\n

    # \u5de5\u4f4d\u8868<\/span>
    \nclass<\/span> desk<\/span>(<\/span>models.<\/span>Model)<\/span>:<\/span>
    \n id<\/span> =<\/span> fields.<\/span>IntField(<\/span>pk=<\/span>True<\/span>,<\/span> auto_increment=<\/span>True<\/span>)<\/span>
    \n name =<\/span> fields.<\/span>CharField(<\/span>max_length=<\/span>20<\/span>)<\/span> # \u5de5\u4f4d\u540d\u79f0<\/span>
    \n zone =<\/span> fields.<\/span>CharField(<\/span>max_length=<\/span>20<\/span>)<\/span> # \u533a\u57df（\u9633\u5149\u533a\/\u9759\u97f3\u533a）<\/span>
    \n monthly_price =<\/span> fields.<\/span>IntField(<\/span>default=<\/span>100<\/span>)<\/span> # \u6708\u79df\u91d1<\/span>
    \n status =<\/span> fields.<\/span>IntField(<\/span>default=<\/span>1<\/span>)<\/span> # 1\u7a7a\u95f2 \/ 0\u5df2\u5360\u7528<\/span>
    \n create_time =<\/span> fields.<\/span>DateField(<\/span>auto_now_add=<\/span>True<\/span>)<\/span>
    \n is_delete =<\/span> fields.<\/span>IntField(<\/span>default=<\/span>0<\/span>)<\/span> # \u903b\u8f91\u5220\u9664<\/span><\/p>\n

    class<\/span> Meta<\/span>:<\/span>
    \n table =<\/span> 'desk'<\/span><\/p>\n

    \u548c\u4e0a\u4e00\u7bc7\u7684\u56de\u6536\u9879\u76ee\u5bf9\u6bd4，\u8fd9\u91cc\u6709\u4e2a\u503c\u5f97\u6ce8\u610f\u7684\u5dee\u5f02：<\/p>\n\n\u9879\u76ee\u4e0a\u6b21（\u56de\u6536）\u672c\u6b21（\u5de5\u4f4d）<\/tr>\n\n\n\n\n
    \u8f6f\u5220\u9664\u5b57\u6bb5<\/td>\nis_del = BooleanField<\/td>\nis_delete = IntField(default=0)<\/td>\n<\/tr>\n
    \u72b6\u6001\u5b57\u6bb5<\/td>\nstatus = BooleanField<\/td>\nstatus = IntField<\/td>\n<\/tr>\n
    \u5173\u8054\u5173\u7cfb<\/td>\n\u56de\u6536\u7ad9 \u2192 \u5206\u7c7b（\u5916\u952e）<\/td>\n\u65e0\u5916\u952e，\u4e24\u5f20\u8868\u72ec\u7acb<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u540c\u4e00\u5957\u4e1a\u52a1\u9aa8\u67b6，\u5b57\u6bb5\u98ce\u683c\u4e0d\u5b8c\u5168\u4e00\u81f4，\u8fd9\u662f\u771f\u5b9e\u9879\u76ee\u7684\u5e38\u6001\u2014\u2014\u6a21\u578b\u8bbe\u8ba1\u8ddf\u7740\u4e1a\u52a1\u8d70，\u4e0d\u5fc5\u5f3a\u6c42\u7edf\u4e00\u6a21\u677f\u3002<\/p>\n

    \u4e09\u3001RAG \u77e5\u8bc6\u5e93：\u4ece docx \u5230 md \u7684\u51cf\u6cd5<\/h3>\n

    app\/routers\/gongwei\/case.py \u7684\u94fe\u8def\u548c\u4e0a\u6b21\u5b8c\u5168\u4e00\u6837：\u8bfb\u6587\u4ef6 \u2192 \u5206\u7247 \u2192 \u5d4c\u5165 \u2192 \u5165\u5e93，<\/p>\n

    import<\/span> os
    \nimport<\/span> chromadb
    \nfrom<\/span> openai import<\/span> OpenAI<\/p>\n

    raw_key =<\/span> os.<\/span>getenv(<\/span>"DASHSCOPE_API_KEY"<\/span>)<\/span>
    \napi_key =<\/span> raw_key.<\/span>strip(<\/span>)<\/span><\/p>\n

    # 1. \u8bfb\u53d6 md \u6587\u4ef6：\u539f\u751f\u6587\u4ef6\u8bfb\u53d6，\u4e0d\u518d\u4f9d\u8d56 docx \u5e93<\/span>
    \ndef<\/span> load_file<\/span>(<\/span>file_path)<\/span>:<\/span>
    \n with<\/span> open<\/span>(<\/span>file_path,<\/span> "r"<\/span>,<\/span> encoding=<\/span>"utf-8"<\/span>)<\/span> as<\/span> f:<\/span>
    \n all_text =<\/span> f.<\/span>read(<\/span>)<\/span>
    \n return<\/span> all_text<\/p>\n

    # 2. \u6587\u672c\u5206\u7247：\u6bcf 200 \u5b57\u7b26\u4e00\u7247<\/span>
    \ndef<\/span> split_text<\/span>(<\/span>all_text)<\/span>:<\/span>
    \n chunks =<\/span> [<\/span>]<\/span>
    \n for<\/span> i in<\/span> range<\/span>(<\/span>0<\/span>,<\/span> len<\/span>(<\/span>all_text)<\/span>,<\/span> 200<\/span>)<\/span>:<\/span>
    \n chunks.<\/span>append(<\/span>all_text[<\/span>i:<\/span>i +<\/span> 200<\/span>]<\/span>)<\/span>
    \n return<\/span> chunks<\/p>\n

    # 3. \u6587\u672c\u5411\u91cf\u5316：qwen3.7-text-embedding，\u6bcf\u6279 20 \u6761<\/span>
    \ndef<\/span> text_embedding<\/span>(<\/span>chunks)<\/span>:<\/span>
    \n client =<\/span> OpenAI(<\/span>
    \n api_key=<\/span>api_key,<\/span>
    \n base_url=<\/span>"https:\/\/ws-xfbad2xxmhwytrdx.cn-beijing.maas.aliyuncs.com\/compatible-mode\/v1"<\/span>,<\/span>
    \n )<\/span>
    \n if<\/span> isinstance<\/span>(<\/span>chunks,<\/span> str<\/span>)<\/span>:<\/span>
    \n chunks =<\/span> [<\/span>chunks]<\/span>
    \n batch_size =<\/span> 20<\/span>
    \n embeddings =<\/span> [<\/span>]<\/span>
    \n for<\/span> i in<\/span> range<\/span>(<\/span>0<\/span>,<\/span> len<\/span>(<\/span>chunks)<\/span>,<\/span> batch_size)<\/span>:<\/span>
    \n batch_chunks =<\/span> chunks[<\/span>i:<\/span>i +<\/span> batch_size]<\/span>
    \n completion =<\/span> client.<\/span>embeddings.<\/span>create(<\/span>
    \n model=<\/span>"qwen3.7-text-embedding"<\/span>,<\/span>
    \n input<\/span>=<\/span>batch_chunks,<\/span>
    \n )<\/span>
    \n batch_embeddings =<\/span> [<\/span>item.<\/span>embedding for<\/span> item in<\/span> completion.<\/span>data]<\/span>
    \n embeddings.<\/span>extend(<\/span>batch_embeddings)<\/span>
    \n return<\/span> embeddings<\/p>\n

    # 4. \u5411\u91cf\u5165\u5e93<\/span>
    \ndef<\/span> save_to_vector_db<\/span>(<\/span>chunks)<\/span>:<\/span>
    \n embeddings =<\/span> text_embedding(<\/span>chunks)<\/span>
    \n client =<\/span> chromadb.<\/span>PersistentClient(<\/span>path=<\/span>r"E:\\\\shijian\\\\P4\\\\zuoye\\\\demo0719\\\\app\\\\routers\\\\gongwei"<\/span>)<\/span>
    \n collection =<\/span> client.<\/span>get_or_create_collection(<\/span>
    \n name=<\/span>"cowork_handbook"<\/span>,<\/span>
    \n embedding_function=<\/span>None<\/span> # \u5411\u91cf\u5916\u90e8\u7b97\u597d，\u5165\u5e93\u4e0d\u4e8c\u6b21\u5d4c\u5165<\/span>
    \n )<\/span>
    \n ids =<\/span> [<\/span>f"chunk_<\/span>{<\/span>i}<\/span><\/span>"<\/span><\/span> for<\/span> i in<\/span> range<\/span>(<\/span>len<\/span>(<\/span>chunks)<\/span>)<\/span>]<\/span>
    \n collection.<\/span>add(<\/span>ids=<\/span>ids,<\/span> embeddings=<\/span>embeddings,<\/span> documents=<\/span>chunks)<\/span><\/p>\n

    if<\/span> __name__ ==<\/span> '__main__'<\/span>:<\/span>
    \n all_text =<\/span> load_file(<\/span>r"E:\\\\shijian\\\\P4\\\\zuoye\\\\demo0719\\\\app\\\\routers\\\\gongwei\\\\\u5171\u4eab\u529e\u516c\u5165\u9a7b\u624b\u518c.md"<\/span>)<\/span>
    \n save_to_vector_db(<\/span>split_text(<\/span>all_text)<\/span>)<\/span>
    \n print<\/span>(<\/span>"\u6784\u5efa\u5b8c\u6210"<\/span>)<\/span><\/p>\n

    \u76f8\u6bd4\u4e0a\u6b21\u7684\u4e09\u4e2a\u5173\u952e\u4f18\u5316\/\u6ce8\u610f\u70b9：<\/p>\n

  • load_file \u4ece python-docx \u6362\u6210\u4e86\u539f\u751f open()：md \u5c31\u662f\u7eaf\u6587\u672c，\u6ca1\u5fc5\u8981\u5f15\u5165 docx \u4f9d\u8d56，\u4ee3\u7801\u66f4\u8f7b\u3002\u77e5\u8bc6\u5e93\u6e90\u6587\u4ef6\u9009\u578b\u65f6，md\/txt \u4f18\u5148，docx \u6b21\u4e4b；<\/li>\n
  • embedding_function=None \u4e00\u8109\u76f8\u627f：\u5916\u90e8\u8c03\u5343\u95ee\u7b97\u597d\u5411\u91cf\u518d\u5165\u5e93，Chroma \u7edd\u4e0d\u80fd\u518d\u7528\u9ed8\u8ba4 embedding，\u5426\u5219\u68c0\u7d22\u5931\u771f\u2014\u2014\u8fd9\u662f\u4e0a\u6b21\u8e29\u8fc7\u7684\u5751，\u8fd9\u6b21\u76f4\u63a5\u7167\u505a；<\/li>\n
  • PersistentClient(path=…) \u663e\u5f0f\u6307\u5b9a\u8def\u5f84：\u5411\u91cf\u5e93\u843d\u5728 app\/routers\/gongwei \u76ee\u5f55\u4e0b，\u8ddf\u77e5\u8bc6\u6e90\u6587\u4ef6\u653e\u4e00\u8d77，\u8bed\u4e49\u6e05\u6670\u3002<\/li>\n

    \u77e5\u8bc6\u5e93\u5185\u5bb9\u6765\u81ea\u300a\u5171\u4eab\u529e\u516c\u5165\u9a7b\u624b\u518c.md\u300b，\u8986\u76d6\u516d\u5927\u7c7b\u5236\u5ea6：\u95e8\u7981\u4e0e\u5230\u8bbf\u3001\u5de5\u4f4d\u4e0e\u7269\u54c1\u3001\u7f51\u7edc\u4e0e\u4f1a\u8bae\u3001\u62bc\u91d1\u4e0e\u9000\u79df\u3001\u5ba0\u7269\u4e0e\u884c\u4e3a\u89c4\u8303\u3001\u53d1\u7968\u4e0e\u7eed\u8d39\u3002<\/p>\n

    \u56db\u3001\u5de5\u4f4d CRUD \u63a5\u53e3<\/h3>\n

    app\/routers\/gongwen_api.py \u63d0\u4f9b\u5de5\u4f4d\u5217\u8868\u548c\u6dfb\u52a0\u4e24\u4e2a\u63a5\u53e3：<\/p>\n

    from<\/span> fastapi import<\/span> APIRouter,<\/span> Query
    \nfrom<\/span> app.<\/span>models import<\/span> desk
    \nfrom<\/span> app.<\/span>schemas.<\/span>gongwei import<\/span> GongWei<\/p>\n

    gongwei_router =<\/span> APIRouter(<\/span>prefix=<\/span>"\/gongwei"<\/span>,<\/span> tags=<\/span>[<\/span>"\u5de5\u4f4d"<\/span>]<\/span>)<\/span><\/p>\n

    @get<\/span> \u5217\u8868：\u5206\u9875 +<\/span> \u6a21\u7cca\u641c\u7d22 +<\/span> \u72b6\u6001\u7b5b\u9009
    \n@post<\/span> \u6dfb\u52a0：\u521b\u5efa\u5de5\u4f4d<\/p>\n

    \u5217\u8868\u63a5\u53e3\u7684\u7b5b\u9009\u903b\u8f91\u503c\u5f97\u4e00\u63d0：<\/p>\n

    @gongwei_router.<\/span>get<\/span>(<\/span>"\/list"<\/span>,<\/span> summary=<\/span>"\u5de5\u4f4d\u5217\u8868"<\/span>)<\/span>
    \nasync<\/span> def<\/span> gongwei_list<\/span>(<\/span>name:<\/span> str<\/span> =<\/span> None<\/span>,<\/span> status:<\/span> int<\/span> =<\/span> None<\/span>,<\/span> page:<\/span> int<\/span> =<\/span> Query(<\/span>1<\/span>,<\/span> ge=<\/span>1<\/span>)<\/span>,<\/span>
    \n size:<\/span> int<\/span> =<\/span> Query(<\/span>3<\/span>,<\/span> ge=<\/span>2<\/span>)<\/span>)<\/span>:<\/span>
    \n query =<\/span> desk.<\/span>all<\/span>(<\/span>)<\/span>
    \n if<\/span> name:<\/span>
    \n query =<\/span> query.<\/span>filter<\/span>(<\/span>desk.<\/span>name.<\/span>contains(<\/span>name)<\/span>)<\/span> # \u6a21\u7cca\u641c\u7d22<\/span>
    \n if<\/span> status:<\/span>
    \n query =<\/span> query.<\/span>filter<\/span>(<\/span>desk.<\/span>status ==<\/span> status)<\/span> # \u72b6\u6001\u7b5b\u9009<\/span>
    \n offset =<\/span> (<\/span>page –<\/span> 1<\/span>)<\/span> *<\/span> size
    \n gongwei =<\/span> await<\/span> query.<\/span>filter<\/span>(<\/span>)<\/span>.<\/span>offset(<\/span>offset)<\/span>.<\/span>limit(<\/span>size)<\/span>
    \n gongwei_list =<\/span> [<\/span>]<\/span>
    \n for<\/span> i in<\/span> gongwei:<\/span>
    \n gongwei_list.<\/span>append(<\/span>{<\/span>
    \n "name"<\/span>:<\/span> i.<\/span>name,<\/span>
    \n "zone"<\/span>:<\/span> i.<\/span>zone,<\/span>
    \n "monthly_price"<\/span>:<\/span> i.<\/span>monthly_price,<\/span>
    \n "status"<\/span>:<\/span> i.<\/span>status,<\/span>
    \n }<\/span>)<\/span>
    \n return<\/span> {<\/span>"code"<\/span>:<\/span> "200"<\/span>,<\/span> "msg"<\/span>:<\/span> "\u67e5\u8be2\u6210\u529f"<\/span>,<\/span> "data"<\/span>:<\/span> gongwei_list}<\/span><\/p>\n

    \u7ec6\u8282：desk.name.contains(name) \u662f Tortoise \u7684\u6a21\u7cca\u67e5\u8be2\u5199\u6cd5，\u7b49\u4ef7\u4e8e SQL \u7684 LIKE '%name%'；\u5206\u9875\u7528 offset\/limit \u7ec4\u5408，\u662f FastAPI \u67e5\u8be2\u63a5\u53e3\u7684\u6807\u914d\u3002Pydantic \u7684 Query(1, ge=1) \u8fd8\u987a\u624b\u505a\u4e86\u53c2\u6570\u6821\u9a8c\u2014\u2014\u9875\u7801\u6700\u5c0f\u4e3a 1，\u6bcf\u9875\u6700\u5c0f\u4e3a 2\u3002<\/p>\n

    \u4e94\u3001\u6838\u5fc3：Agent \u667a\u80fd\u52a9\u624b<\/h3>\n

    app\/routers\/gongwen_llm.py，\u4e09\u4e2a\u5de5\u5177\u5206\u522b\u5bf9\u5e94\u5236\u5ea6\u95ee\u7b54\u3001\u5de5\u4f4d\u67e5\u8be2\u3001\u53c2\u89c2\u9884\u7ea6\u3002<\/p>\n

    5.1 \u5de5\u5177\u4e00：\u5236\u5ea6\u95ee\u7b54（rag_search）<\/h4>\n

    \u4f1a\u5458\u95ee"\u62bc\u91d1\u8981\u4ea4\u591a\u5c11"\u201c\u80fd\u5e26\u5ba0\u7269\u5417\u201d，\u5411\u91cf\u5316\u95ee\u9898 \u2192 Chroma \u68c0\u7d22\u624b\u518c\u6700\u76f8\u5173 2 \u6bb5 \u2192 \u62fc prompt \u4ea4\u7ed9\u5927\u6a21\u578b：<\/p>\n

    @tool<\/span>(<\/span>description=<\/span>"\u67e5\u8be2\u5171\u4eab\u529e\u516c\u5165\u9a7b\u5236\u5ea6\u624b\u518c，\u62bc\u91d1\/\u95e8\u7981\/\u5ba0\u7269\/\u9000\u79df\u7b49\u5236\u5ea6\u95ee\u9898\u8c03\u7528，\u53c2\u6570 query：\u7528\u6237\u63d0\u95ee"<\/span>)<\/span>
    \ndef<\/span> rag_search<\/span>(<\/span>query:<\/span> str<\/span>)<\/span> –<\/span>><\/span> str<\/span>:<\/span>
    \n chroma =<\/span> chromadb.<\/span>PersistentClient(<\/span>path=<\/span>r"E:\\\\shijian\\\\P4\\\\zuoye\\\\demo0719\\\\app\\\\routers\\\\gongwei"<\/span>)<\/span>
    \n collection =<\/span> chroma.<\/span>get_collection(<\/span>name=<\/span>"cowork_handbook"<\/span>)<\/span>
    \n query_str =<\/span> text_embedding(<\/span>query)<\/span>
    \n result =<\/span> collection.<\/span>query(<\/span>query_embeddings=<\/span>query_str,<\/span> n_results=<\/span>2<\/span>,<\/span> include=<\/span>[<\/span>"documents"<\/span>]<\/span>)<\/span>
    \n retsult_text =<\/span> "\\\\n"<\/span>.<\/span>join(<\/span>result[<\/span>"documents"<\/span>]<\/span>[<\/span>0<\/span>]<\/span>)<\/span>
    \n pormpt =<\/span> f"""
    \n \u6839\u636e\u5171\u4eab\u529e\u516c\u5165\u9a7b\u5236\u5ea6\u624b\u518c，\u62bc\u91d1\/\u95e8\u7981\/\u5ba0\u7269\/\u9000\u79df\u7b49\u5236\u5ea6\u95ee\u9898\u8c03\u7528，
    \n \u7528\u6237\u8f93\u5165\u95ee\u9898\u4e3a：<\/span>{<\/span>query}<\/span><\/span>
    \n \u8bf7\u6839\u636e\u67e5\u8be2\u7ed3\u679c，\u7ed9\u51fa\u8be6\u7ec6\u56de\u7b54：<\/span>{<\/span>retsult_text}<\/span><\/span>
    \n """<\/span><\/span>
    \n resp =<\/span> llm.<\/span>invoke(<\/span>[<\/span>{<\/span>"role"<\/span>:<\/span> "user"<\/span>,<\/span> "content"<\/span>:<\/span> pormpt}<\/span>]<\/span>)<\/span>
    \n return<\/span> resp.<\/span>content<\/p>\n

    \u548c\u4e0a\u6b21\u7684 rag_search \u5bf9\u6bd4，\u8fd9\u6b21\u63d0\u793a\u8bcd\u76f8\u5bf9\u5bbd\u677e（\u201c\u6839\u636e\u67e5\u8be2\u7ed3\u679c\u7ed9\u51fa\u8be6\u7ec6\u56de\u7b54\u201d），\u6ca1\u6709\u4e0a\u6b21\u90a3\u4e48\u5f3a\u7684"\u7981\u6b62\u7f16\u9020"\u7ea6\u675f\u2014\u2014\u63d0\u793a\u8bcd\u7684\u4e25\u683c\u7a0b\u5ea6\u5e94\u8be5\u8ddf\u4e1a\u52a1\u98ce\u9669\u6302\u94a9：\u6d89\u53ca\u5371\u9669\u54c1\u5904\u7f6e（\u4e0a\u6b21）\u5fc5\u987b\u786c\u7ea6\u675f，\u5236\u5ea6\u95ee\u7b54（\u672c\u6b21）\u53ef\u4ee5\u5bbd\u677e\u4e9b\u3002\u8fd9\u662f\u8bbe\u8ba1\u4e0a\u7684\u53d6\u820d，\u4e0d\u662f\u5931\u8bef\u3002<\/p>\n

    5.2 \u5de5\u5177\u4e8c：\u67e5\u5de5\u4f4d（search_desks）<\/h4>\n

    \u4f1a\u5458\u8bf4"\u9633\u5149\u533a\u6709\u6ca1\u6709\u7a7a\u4f4d"，\u6216\u8005\u53ea\u8bf4"\u770b\u770b\u6709\u54ea\u4e9b\u5de5\u4f4d"，AI \u90fd\u80fd\u5904\u7406：<\/p>\n

    @tool<\/span>(<\/span>description=<\/span>"\u67e5\u8be2\u5de5\u4f4d，\u53c2\u6570zone\u4f20\u533a\u57df\u540d\u79f0(\u9633\u5149\u533a\/\u9759\u97f3\u533a)，\u4e0d\u4f20\u5219\u67e5\u8be2\u6240\u6709\u53ef\u79df\u5de5\u4f4d"<\/span>)<\/span>
    \nasync<\/span> def<\/span> search_desks<\/span>(<\/span>zone:<\/span> str<\/span> =<\/span> None<\/span>)<\/span>:<\/span>
    \n query =<\/span> desk.<\/span>filter<\/span>(<\/span>is_delete=<\/span>0<\/span>,<\/span> status=<\/span>1<\/span>)<\/span> # \u53ea\u770b\u672a\u5220\u9664 + \u7a7a\u95f2<\/span>
    \n if<\/span> zone:<\/span>
    \n query =<\/span> query.<\/span>filter<\/span>(<\/span>zone=<\/span>zone)<\/span> # \u6309\u533a\u57df\u8fc7\u6ee4<\/span>
    \n desks =<\/span> await<\/span> query.<\/span>all<\/span>(<\/span>)<\/span>
    \n if<\/span> not<\/span> desks:<\/span>
    \n return<\/span> "\u6682\u65f6\u6ca1\u6709\u7a7a\u95f2\u5de5\u4f4d"<\/span>
    \n text =<\/span> ""<\/span>
    \n for<\/span> i in<\/span> desks:<\/span>
    \n text +=<\/span> f"\u5de5\u4f4d\u7f16\u53f7：<\/span>{<\/span>i.<\/span>id<\/span>}<\/span><\/span>，\u533a\u57df：<\/span>{<\/span>i.<\/span>zone}<\/span><\/span>，\u5de5\u4f4d\u72b6\u6001：<\/span>{<\/span>i.<\/span>status}<\/span><\/span>(1\u8868\u793a\u7a7a\u95f2，0\u8868\u793a\u5df2\u5360\u7528)，\u6708\u79df\u91d1:<\/span>{<\/span>i.<\/span>monthly_price}<\/span><\/span>\\\\n"<\/span><\/span>
    \n return<\/span> text<\/p>\n

    \u6ce8\u610f zone: str = None \u662f\u53ef\u9009\u53c2\u6570\u2014\u2014LangChain \u5de5\u5177\u652f\u6301\u9ed8\u8ba4\u503c，Agent \u4f1a\u6839\u636e\u7528\u6237\u95ee\u9898\u51b3\u5b9a\u4f20\u4e0d\u4f20：\u63d0\u5230\u533a\u57df\u5c31\u8fc7\u6ee4，\u6ca1\u63d0\u5c31\u5168\u67e5\u3002\u8fd4\u56de\u6587\u672c\u91cc\u628a 1\/0 \u7684\u542b\u4e49\u5199\u6e05\u695a，\u6a21\u578b\u624d\u77e5\u9053\u600e\u4e48\u7ec4\u7ec7\u6210"\u4eba\u8bdd"\u56de\u590d\u7ed9\u7528\u6237\u3002<\/p>\n

    5.3 \u5de5\u5177\u4e09：\u521b\u5efa\u53c2\u89c2\u9884\u7ea6（create_visit_booking）<\/h4>\n

    \u9884\u7ea6\u53c2\u89c2\u662f\u4e1a\u52a1\u6838\u5fc3，\u53bb\u91cd\u903b\u8f91\u7528 Redis \u5b9e\u73b0\u2014\u2014\u540c\u4f1a\u5458\u540c\u4e00\u5929\u53ea\u80fd\u9884\u7ea6 1 \u6b21：<\/p>\n

    @tool<\/span>(<\/span>description=<\/span>"\u521b\u5efa\u53c2\u89c2\u9884\u7ea6；member_id\u4f1a\u5458ID，desk_id\u5de5\u4f4dID，visit_date\u65e5\u671fYYYY-MM-DD；\u540c\u4f1a\u5458\u540c\u4e00\u5929\u4ec51\u6b21\u9884\u7ea6"<\/span>)<\/span>
    \nasync<\/span> def<\/span> create_visit_booking<\/span>(<\/span>member_id:<\/span> int<\/span>,<\/span> desk_id:<\/span> int<\/span>,<\/span> visit_date:<\/span> str<\/span>)<\/span>:<\/span>
    \n members =<\/span> await<\/span> member.<\/span>filter<\/span>(<\/span>id<\/span>=<\/span>member_id)<\/span>.<\/span>first(<\/span>)<\/span>
    \n if<\/span> not<\/span> members:<\/span>
    \n return<\/span> "\u4f1a\u5458\u4e0d\u5b58\u5728"<\/span>
    \n desks =<\/span> await<\/span> desk.<\/span>filter<\/span>(<\/span>id<\/span>=<\/span>desk_id)<\/span>.<\/span>first(<\/span>)<\/span>
    \n if<\/span> not<\/span> desks:<\/span>
    \n return<\/span> "\u5de5\u4f4d\u4e0d\u5b58\u5728"<\/span>
    \n if<\/span> desks.<\/span>status !=<\/span> 1<\/span>:<\/span>
    \n return<\/span> "\u5de5\u4f4d\u5df2\u5360\u7528"<\/span><\/p>\n

    # Redis \u53bb\u91cd：\u540c\u4e00\u4f1a\u5458\u540c\u4e00\u5929\u53ea\u5141\u8bb8 1 \u6b21\u9884\u7ea6<\/span>
    \n key =<\/span> f"member_id:desk_id:<\/span>{<\/span>visit_date}<\/span><\/span>"<\/span><\/span>
    \n fishe =<\/span> await<\/span> r.<\/span>lrange(<\/span>key,<\/span> 0<\/span>,<\/span> –<\/span>1<\/span>)<\/span>
    \n for<\/span> i in<\/span> fishe:<\/span>
    \n info =<\/span> json.<\/span>loads(<\/span>i)<\/span>
    \n if<\/span> info[<\/span>"member_id"<\/span>]<\/span> ==<\/span> member_id:<\/span>
    \n return<\/span> "\u540c\u4f1a\u5458\u540c\u4e00\u5929\u4ec51\u6b21\u9884\u7ea6"<\/span><\/p>\n

    booking_no =<\/span> f"D<\/span>{<\/span>datetime.<\/span>datetime.<\/span>now(<\/span>)<\/span>.<\/span>strftime(<\/span>'%Y%m%d%H%M%S'<\/span>)<\/span>}<\/span><\/span>"<\/span><\/span>
    \n desk_dict =<\/span> {<\/span>
    \n "booking_no"<\/span>:<\/span> booking_no,<\/span>
    \n "member_id"<\/span>:<\/span> member_id,<\/span>
    \n "member_name"<\/span>:<\/span> members.<\/span>name,<\/span>
    \n "visit_date"<\/span>:<\/span> visit_date,<\/span>
    \n "desk_id"<\/span>:<\/span> desk_id,<\/span>
    \n "desk_name"<\/span>:<\/span> desks.<\/span>name,<\/span>
    \n "create_time"<\/span>:<\/span> datetime.<\/span>datetime.<\/span>now(<\/span>)<\/span>.<\/span>strftime(<\/span>"%Y-%m-%d %H:%M:%S"<\/span>)<\/span>,<\/span>
    \n }<\/span>
    \n await<\/span> r.<\/span>lpush(<\/span>key,<\/span> json.<\/span>dumps(<\/span>desk_dict,<\/span> ensure_ascii=<\/span>False<\/span>)<\/span>)<\/span>
    \n return<\/span> f"\u9884\u7ea6\u6210\u529f！\u9884\u7ea6\u7f16\u53f7：<\/span>{<\/span>booking_no}<\/span><\/span>，\u5de5\u4f4d\u540d\u79f0：<\/span>{<\/span>desks.<\/span>name}<\/span><\/span>"<\/span><\/span><\/p>\n

    \u4e09\u5c42\u6821\u9a8c\u5c42\u5c42\u9012\u8fdb：\u4f1a\u5458\u5b58\u5728 \u2192 \u5de5\u4f4d\u5b58\u5728\u4e14\u7a7a\u95f2 \u2192 Redis \u67e5\u91cd\u3002\u8ddf\u524d\u4e00\u7bc7\u7684 create_pickup_order \u5bf9\u6bd4，\u53bb\u91cd\u7b56\u7565\u6362\u4e86\u4e2a\u601d\u8def：<\/p>\n

    LPUSH + LRANGE \u7684\u505a\u6cd5\u66f4\u9002\u5408"\u6309\u6761\u4ef6\u53bb\u91cd + \u6570\u636e\u53ef\u67e5"\u7684\u573a\u666f\u2014\u2014\u5b83\u628a\u6bcf\u6b21\u9884\u7ea6\u90fd\u5b58\u6210\u4e86\u5b8c\u6574\u8bb0\u5f55，\u540e\u9762\u63a5\u67e5\u8be2\u3001\u7edf\u8ba1\u90fd\u4e0d\u7528\u518d\u8bbe\u8ba1\u6570\u636e\u7ed3\u6784\u3002<\/p>\n

    5.4 Agent \u7ec4\u88c5<\/h4>\n

    tools =<\/span> [<\/span>rag_search,<\/span> search_desks,<\/span> create_visit_booking]<\/span>
    \nsystem_prompt =<\/span> f"""\u4f60\u662f\u5171\u4eab\u529e\u516c\u52a9\u624b，\u4ec5\u7b80\u4f53\u4e2d\u6587，\u4e25\u683c\u6267\u884c：
    \n1. \u7528\u6237\u8be2\u95ee\u62bc\u91d1\u3001\u95e8\u7981\u3001\u8bbf\u5ba2\u3001\u5ba0\u7269\u3001\u9000\u79df\u3001\u7eed\u8d39\u7b49\u5236\u5ea6\u95ee\u9898，\u5fc5\u987b\u8c03\u7528rag_search_tool\u68c0\u7d22\u624b\u518c，\u7981\u6b62\u7f16\u9020；
    \n2. \u7528\u6237\u67e5\u8be2\u5de5\u4f4d，\u8c03\u7528search_desks\u5de5\u5177；
    \n3. \u7528\u6237\u9884\u7ea6\u53c2\u89c2，\u8c03\u7528create_visit_booking，\u9700\u8981\u4f1a\u5458ID\u3001\u5de5\u4f4dID\u3001\u53c2\u89c2\u65e5\u671f；
    \n4. \u9884\u7ea6\u524d\u6821\u9a8c\u540c\u4e00\u4f1a\u5458\u540c\u4e00\u5929\u4e0d\u53ef\u91cd\u590d\u9884\u7ea6，\u5de5\u4f4d\u5fc5\u987b\u53ef\u79df；
    \n\u4e1a\u52a1\u9700\u6c42\u5fc5\u987b\u8c03\u7528\u5bf9\u5e94\u5de5\u5177，\u4e0d\u662f\u4e1a\u52a1\u8981\u6c42\u76f4\u63a5\u56de\u7b54\u7528\u6237\u3002
    \n"""<\/span><\/span>
    \ncheckpointer =<\/span> InMemorySaver(<\/span>)<\/span>
    \nchant =<\/span> create_agent(<\/span>
    \n model=<\/span>llm,<\/span> # qwen3.7-plus<\/span>
    \n tools=<\/span>tools,<\/span>
    \n system_prompt=<\/span>system_prompt,<\/span>
    \n checkpointer=<\/span>checkpointer,<\/span> # \u4f1a\u8bdd\u8bb0\u5fc6<\/span>
    \n)<\/span><\/p>\n

    system prompt \u7684\u5199\u6cd5\u503c\u5f97\u5b66\u4e60：\u628a"\u4ec0\u4e48\u60c5\u51b5\u8c03\u4ec0\u4e48\u5de5\u5177"\u7528\u7f16\u53f7\u5217\u6e05\u695a，\u5de5\u5177\u804c\u8d23\u8fb9\u754c\u4e00\u76ee\u4e86\u7136，\u6a21\u578b\u8def\u7531\u9519\u8bef\u7684\u6982\u7387\u5927\u5e45\u4e0b\u964d\u3002\u8fd9\u662f Agent \u5de5\u7a0b\u91cc\u6027\u4ef7\u6bd4\u6700\u9ad8\u7684\u4e00\u73af\u2014\u2014\u5148\u628a prompt \u5199\u597d，\u6bd4\u5806\u4e2d\u95f4\u4ef6\u66f4\u89c1\u6548\u3002<\/p>\n

    5.5 \u5bf9\u5916\u63a5\u53e3<\/h4>\n

    @llm2_router.<\/span>post<\/span>(<\/span>"\/chat"<\/span>,<\/span> summary=<\/span>"\u4e0e\u667a\u80fd\u52a9\u624b\u8fdb\u884c\u5bf9\u8bdd"<\/span>)<\/span>
    \nasync<\/span> def<\/span> chat<\/span>(<\/span>req:<\/span> DuiHua)<\/span>:<\/span>
    \n config =<\/span> {<\/span>"configurable"<\/span>:<\/span> {<\/span>"thread_id"<\/span>:<\/span> req.<\/span>session_id}<\/span>}<\/span> # \u4f1a\u8bdd\u9694\u79bb<\/span>
    \n input_msg =<\/span> {<\/span>"messages"<\/span>:<\/span> [<\/span>HumanMessage(<\/span>content=<\/span>req.<\/span>user_query)<\/span>]<\/span>}<\/span>
    \n res =<\/span> await<\/span> chant.<\/span>ainvoke(<\/span>input_msg,<\/span> config=<\/span>config)<\/span>
    \n return<\/span> {<\/span>
    \n "code"<\/span>:<\/span> 200<\/span>,<\/span>
    \n "msg"<\/span>:<\/span> "\u5bf9\u8bdd\u6267\u884c\u6210\u529f"<\/span>,<\/span>
    \n "data"<\/span>:<\/span> res[<\/span>"messages"<\/span>]<\/span>[<\/span>–<\/span>1<\/span>]<\/span>.<\/span>content,<\/span>
    \n }<\/span><\/p>\n

    \u524d\u7aef\u53ea\u4f20 session_id + user_query，\u5269\u4e0b\u5168\u4ea4\u7ed9 Agent：<\/p>\n

    \u7528\u6237: "\u62bc\u91d1\u8981\u4ea4\u591a\u5c11？"
    \n \u2192 rag_search("\u62bc\u91d1") \u2192 \u68c0\u7d22\u624b\u518c \u2192 "\u5165\u9a7b\u65f6\u7f34\u7eb3\u62bc\u91d1\u4e3a\u6708\u79df\u91d1\u76841\u500d，\u9000\u79df\u65e0\u635f\u574f\u65e0\u6b20\u8d39\u5168\u989d\u9000\u8fd8"<\/p>\n

    \u7528\u6237: "\u9759\u97f3\u533a\u6709\u7a7a\u4f4d\u5417？"
    \n \u2192 search_desks(zone="\u9759\u97f3\u533a") \u2192 \u8fd4\u56de\u7a7a\u95f2\u5de5\u4f4d\u5217\u8868<\/p>\n

    \u7528\u6237: "\u5e2e\u6211\u7ea6\u660e\u5929\u53c2\u89c2 3 \u53f7\u5de5\u4f4d，\u6211\u662f 2 \u53f7\u4f1a\u5458"
    \n \u2192 create_visit_booking(member_id=2, desk_id=3, visit_date="2026-08-12") \u2192 \u8fd4\u56de\u9884\u7ea6\u7f16\u53f7<\/p>\n","protected":false},"excerpt":{"rendered":"

    \u4e00\u3001\u9879\u76ee\u80cc\u666f
    \n\u628a\u300a\u5171\u4eab\u529e\u516c\u5165\u9a7b\u624b\u518c.md\u300b\u505a\u6210 RAG \u77e5\u8bc6\u5e93，\u5236\u5ea6\u95ee\u9898\u7531 AI \u4f9d\u636e\u624b\u518c\u56de\u7b54；\u628a\u5de5\u4f4d\u6570\u636e\u3001\u53c2\u89c2\u9884\u7ea6\u6302\u6210 Agent \u7684 Tool，\u8ba9 AI \u80fd\u67e5\u7a7a\u95f2\u5de5\u4f4d\u3001\u80fd\u5e2e\u5fd9\u7ea6\u53c2\u89c2；
    \n\u4e8c\u3001\u6570\u636e\u6a21\u578b：\u4f1a\u5458 \u5de5\u4f4d
    \napp\/models\/gongwei.py \u5b9a\u4e49\u4e86\u4e24\u5f20\u8868：
    \nfrom tortoise import models, fields# \u4f1a\u5458\u8868
    \nclass member(models<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[72,997,81],"topic":[],"class_list":["post-93086","post","type-post","status-publish","format-standard","hentry","category-server","tag-fastapi","tag-langchain","tag-python"],"yoast_head":"\nFastAPI + LangChain Agent + RAG\uff1a\u6253\u9020\u5171\u4eab\u529e\u516c\u667a\u80fd\u52a9\u624b\uff08\u5236\u5ea6\u95ee\u7b54 \/ \u5de5\u4f4d\u67e5\u8be2 \/ \u53c2\u89c2\u9884\u7ea6\uff09 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/93086.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"FastAPI + LangChain Agent + RAG\uff1a\u6253\u9020\u5171\u4eab\u529e\u516c\u667a\u80fd\u52a9\u624b\uff08\u5236\u5ea6\u95ee\u7b54 \/ \u5de5\u4f4d\u67e5\u8be2 \/ \u53c2\u89c2\u9884\u7ea6\uff09 - 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