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AnalyticDB

AnalyticDB for PostgreSQL 是一种大规模并行处理（MPP）数据仓库服务，旨在在线分析大量数据。

AnalyticDB for PostgreSQL 是基于开源的 Greenplum Database 项目开发的，并由 Alibaba Cloud 进行了深入的扩展增强。AnalyticDB for PostgreSQL 兼容 ANSI SQL 2003 语法以及 PostgreSQL 和 Oracle 数据库生态系统。AnalyticDB for PostgreSQL 还支持行存储和列存储。AnalyticDB for PostgreSQL 能够以高性能处理离线的 PB 级数据，并支持高并发的在线查询。

你需要安装 langchain-community 使用 pip install -qU langchain-community 来使用这个集成

本笔记本展示了如何使用与AnalyticDB向量数据库相关的功能。 要运行，您应该有一个AnalyticDB实例并正在运行：

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

通过调用OpenAI API分割文档并获取嵌入

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 Reference:TextLoader

通过设置相关的环境变量连接到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中

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,
)

查询和检索数据

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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