AnalyticDB

适用于 PostgreSQL 的 AnalyticDB 是一种大规模并行处理 (MPP) 数据仓库服务，旨在在线分析海量数据。

适用于 PostgreSQL 的 AnalyticDB 是基于开源 Greenplum Database 项目开发，并由阿里云深度扩展增强。适用于 PostgreSQL 的 AnalyticDB 兼容 ANSI SQL 2003 语法以及 PostgreSQL 和 Oracle 数据库生态系统。适用于 PostgreSQL 的 AnalyticDB 同时支持行存储和列存储。适用于 PostgreSQL 的 AnalyticDB 能够高性能地离线处理 PB 级数据，并支持高并发在线查询。

您需要安装 langchain-community (使用 pip install -qU langchain-community) 才能使用此集成

本教程演示了如何使用与 AnalyticDB 向量数据库相关的功能。要运行，您应该有一个正在运行的 AnalyticDB 实例

使用 AnalyticDB 云向量数据库。点击此处快速部署。

from langchain_community.vectorstores import AnalyticDB
from langchain_openai import OpenAIEmbeddings
from langchain_text_splitters import CharacterTextSplitter

API 参考：AnalyticDB | OpenAIEmbeddings | CharacterTextSplitter

通过调用 OpenAI API 拆分文档并获取嵌入

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()

API 参考：TextLoader

通过设置相关环境变量连接到 AnalyticDB。

export PG_HOST={your_analyticdb_hostname}
export PG_PORT={your_analyticdb_port} # Optional, default is 5432
export PG_DATABASE={your_database} # Optional, default is postgres
export PG_USER={database_username}
export PG_PASSWORD={database_password}

然后将您的嵌入和文档存储到 AnalyticDB

import os

connection_string = AnalyticDB.connection_string_from_db_params(
    driver=os.environ.get("PG_DRIVER", "psycopg2cffi"),
    host=os.environ.get("PG_HOST", "localhost"),
    port=int(os.environ.get("PG_PORT", "5432")),
    database=os.environ.get("PG_DATABASE", "postgres"),
    user=os.environ.get("PG_USER", "postgres"),
    password=os.environ.get("PG_PASSWORD", "postgres"),
)

vector_db = AnalyticDB.from_documents(
    docs,
    embeddings,
    connection_string=connection_string,
)

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.

向量存储概念指南
向量存储操作指南

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