Dataherald

Dataherald 是一种自然语言到 SQL。

本页介绍如何使用Dataherald API在 LangChain 中。

安装和设置

安装要求

pip install dataherald

前往 dataherald 并在此处注册
创建应用程序并获取您的API KEY
设置API KEY作为环境变量DATAHERALD_API_KEY

包装

效用

存在一个包装此 API 的 DataheraldAPIWrapper 实用程序。要导入此实用程序，请执行以下作：

from langchain_community.utilities.dataherald import DataheraldAPIWrapper

API 参考：DataheraldAPIWrapper

有关此包装器的更详细演练，请参阅此笔记本。

工具

您可以在代理中使用该工具，如下所示：

from langchain_community.utilities.dataherald import DataheraldAPIWrapper
from langchain_community.tools.dataherald.tool import DataheraldTextToSQL
from langchain_openai import ChatOpenAI
from langchain import hub
from langchain.agents import AgentExecutor, create_react_agent, load_tools

api_wrapper = DataheraldAPIWrapper(db_connection_id="<db_connection_id>")
tool = DataheraldTextToSQL(api_wrapper=api_wrapper)
llm = ChatOpenAI(model="gpt-3.5-turbo", temperature=0)
prompt = hub.pull("hwchase17/react")
agent = create_react_agent(llm, tools, prompt)
agent_executor = AgentExecutor(agent=agent, tools=tools, verbose=True, handle_parsing_errors=True)
agent_executor.invoke({"input":"Return the sql for this question: How many employees are in the company?"})

输出

> Entering new AgentExecutor chain...
I need to use a tool that can convert this question into SQL.
Action: dataherald
Action Input: How many employees are in the company?Answer: SELECT
    COUNT(*) FROM employeesI now know the final answer
Final Answer: SELECT
    COUNT(*)
FROM
    employees

> Finished chain.
{'input': 'Return the sql for this question: How many employees are in the company?', 'output': "SELECT \n    COUNT(*)\nFROM \n    employees"}

有关工具的更多信息，请参阅此页面。