GraphQL
GraphQL 是一种用于 API 的查询语言,也是一种针对你的数据执行这些查询的运行时。
GraphQL
提供了对你的 API 中数据的完整且易于理解的描述,使客户端能够准确地请求他们需要的内容,不多不少,使得随着时间的推移更容易发展 API,并支持强大的开发人员工具。
通过在提供给 Agent 的工具列表中包含 BaseGraphQLTool
,你可以授予你的 Agent 从 GraphQL API 查询数据以满足任何你需要的目标的能力。
这个 Jupyter Notebook 演示了如何将 GraphQLAPIWrapper
组件与 Agent 一起使用。
在这个例子中,我们将使用以下端点提供的公共 星球大战 GraphQL API
:https://swapi-graphql.netlify.app/.netlify/functions/index。
首先,你需要安装 httpx
和 gql
Python 包。
pip install httpx gql > /dev/null
%pip install --upgrade --quiet langchain-community
现在,让我们使用指定的星球大战 API 端点创建一个 BaseGraphQLTool 实例,并使用该工具初始化一个 Agent。
from langchain.agents import AgentType, initialize_agent, load_tools
from langchain_openai import OpenAI
llm = OpenAI(temperature=0)
tools = load_tools(
["graphql"],
graphql_endpoint="https://swapi-graphql.netlify.app/.netlify/functions/index",
)
agent = initialize_agent(
tools, llm, agent=AgentType.ZERO_SHOT_REACT_DESCRIPTION, verbose=True
)
现在,我们可以使用 Agent 对星球大战 GraphQL API 运行查询。让我们让 Agent 列出所有星球大战电影及其上映日期。
graphql_fields = """allFilms {
films {
title
director
releaseDate
speciesConnection {
species {
name
classification
homeworld {
name
}
}
}
}
}
"""
suffix = "Search for the titles of all the stawars films stored in the graphql database that has this schema "
agent.run(suffix + graphql_fields)
[1m> Entering new AgentExecutor chain...[0m
[32;1m[1;3m I need to query the graphql database to get the titles of all the star wars films
Action: query_graphql
Action Input: query { allFilms { films { title } } }[0m
Observation: [36;1m[1;3m"{\n \"allFilms\": {\n \"films\": [\n {\n \"title\": \"A New Hope\"\n },\n {\n \"title\": \"The Empire Strikes Back\"\n },\n {\n \"title\": \"Return of the Jedi\"\n },\n {\n \"title\": \"The Phantom Menace\"\n },\n {\n \"title\": \"Attack of the Clones\"\n },\n {\n \"title\": \"Revenge of the Sith\"\n }\n ]\n }\n}"[0m
Thought:[32;1m[1;3m I now know the titles of all the star wars films
Final Answer: The titles of all the star wars films are: A New Hope, The Empire Strikes Back, Return of the Jedi, The Phantom Menace, Attack of the Clones, and Revenge of the Sith.[0m
[1m> Finished chain.[0m
'The titles of all the star wars films are: A New Hope, The Empire Strikes Back, Return of the Jedi, The Phantom Menace, Attack of the Clones, and Revenge of the Sith.'