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Hologres 是阿里云开发的一款统一实时数仓服务。您可以使用 Hologres 对大量数据进行实时写入、更新、处理和分析。 Hologres 支持标准 SQL 语法，与 PostgreSQL 兼容，并支持大多数 PostgreSQL 函数。Hologres 支持对 PB 级数据进行在线分析处理（OLAP）和即席分析，并提供高并发、低延迟的在线数据服务。
Hologres 通过集成 Proxima 提供向量数据库功能。 Proxima 是阿里达摩院开发的一款高性能软件库，可用于搜索向量的最近邻。Proxima 比 Faiss 等同类开源软件具有更高的稳定性和性能。Proxima 支持高吞吐量、低延迟地搜索相似文本或图像嵌入。Hologres 与 Proxima 深度集成，提供高性能向量搜索服务。
本 notebook 展示了如何使用与 Hologres Proxima 向量数据库相关的功能。 点击此处快速部署 Hologres 云实例。 
pip install -qU  langchain_community hologres-vector

from langchain_community.vectorstores import Hologres
from langchain_openai import OpenAIEmbeddings
from langchain_text_splitters import CharacterTextSplitter
调用 OpenAI API 对文档进行分割并获取嵌入 
from langchain_community.document_loaders import TextLoader

loader = TextLoader("../../how_to/state_of_the_union.txt")
documents = loader.load()
text_splitter = CharacterTextSplitter(chunk_size=1000, chunk_overlap=0)
docs = text_splitter.split_documents(documents)

embeddings = OpenAIEmbeddings()
通过设置相关环境变量连接到 Hologres。 
export PG_HOST={host}
export PG_PORT={port} # Optional, default is 80
export PG_DATABASE={db_name} # Optional, default is postgres
export PG_USER={username}
export PG_PASSWORD={password}
然后将您的嵌入和文档存储到 Hologres 
import os

connection_string = Hologres.connection_string_from_db_params(
    host=os.environ.get("PGHOST", "localhost"),
    port=int(os.environ.get("PGPORT", "80")),
    database=os.environ.get("PGDATABASE", "postgres"),
    user=os.environ.get("PGUSER", "postgres"),
    password=os.environ.get("PGPASSWORD", "postgres"),
)

vector_db = Hologres.from_documents(
    docs,
    embeddings,
    connection_string=connection_string,
    table_name="langchain_example_embeddings",
)
查询并检索数据 
query = "What did the president say about Ketanji Brown Jackson"
docs = vector_db.similarity_search(query)

print(docs[0].page_content)

Tonight. I call on the Senate to: Pass the Freedom to Vote Act. Pass the John Lewis Voting Rights Act. And while you're at it, pass the Disclose Act so Americans can know who is funding our elections.

Tonight, I'd like to honor someone who has dedicated his life to serve this country: Justice Stephen Breyer—an Army veteran, Constitutional scholar, and retiring Justice of the United States Supreme Court. Justice Breyer, thank you for your service.

One of the most serious constitutional responsibilities a President has is nominating someone to serve on the United States Supreme Court.

And I did that 4 days ago, when I nominated Circuit Court of Appeals Judge Ketanji Brown Jackson. One of our nation's top legal minds, who will continue Justice Breyer's legacy of excellence.
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