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Astra DB

DataStax Astra DB is a serverless AI-ready database built on Apache Cassandra® and made conveniently availablev through an easy-to-use JSON API.

本笔记本介绍了如何使用 Astra DB 来存储聊天消息历史。

设置​

要运行此笔记本，你需要一个正在运行的 Astra DB。在你的 Astra 仪表板上获取连接密钥：

  • API端点看起来像 https://01234567-89ab-cdef-0123-456789abcdef-us-east1.apps.astra.datastax.com；
  • 数据库令牌看起来像 AstraCS:aBcD0123...。
!pip install "langchain-astradb>=0.6,<0.7"

设置数据库连接参数和密钥​

import getpass

ASTRA_DB_API_ENDPOINT = input("ASTRA_DB_API_ENDPOINT = ")
ASTRA_DB_APPLICATION_TOKEN = getpass.getpass("ASTRA_DB_APPLICATION_TOKEN = ")
ASTRA_DB_API_ENDPOINT =  https://01234567-89ab-cdef-0123-456789abcdef-us-east1.apps.astra.datastax.com
ASTRA_DB_APPLICATION_TOKEN =  ········

示例​

from langchain_astradb import AstraDBChatMessageHistory

message_history = AstraDBChatMessageHistory(
    session_id="test-session",
    api_endpoint=ASTRA_DB_API_ENDPOINT,
    token=ASTRA_DB_APPLICATION_TOKEN,
)

message_history.add_user_message("hi!")

message_history.add_ai_message("hello, how are you?")

API 参考： AstraDBChatMessageHistory

message_history.messages
[HumanMessage(content='hi!', additional_kwargs={}, response_metadata={}),
 AIMessage(content='hello, how are you?', additional_kwargs={}, response_metadata={})]