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https://github.com/hwchase17/langchain
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450c458f8f
**Description:** Integrate [dataherald](https://www.dataherald.com) tool, It is a natural language-to-SQL tool. **Dependencies:** Install dataherald sdk to use it, ``` pip install dataherald ``` --------- Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com> Co-authored-by: Bagatur <baskaryan@gmail.com> Co-authored-by: Christophe Bornet <cbornet@hotmail.com>
68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
"""Util that calls Dataherald."""
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from typing import Any, Dict, Optional
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from langchain_core.pydantic_v1 import BaseModel, Extra, root_validator
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from langchain_core.utils import get_from_dict_or_env
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class DataheraldAPIWrapper(BaseModel):
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"""Wrapper for Dataherald.
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Docs for using:
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1. Go to dataherald and sign up
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2. Create an API key
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3. Save your API key into DATAHERALD_API_KEY env variable
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4. pip install dataherald
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"""
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dataherald_client: Any #: :meta private:
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db_connection_id: str
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dataherald_api_key: Optional[str] = None
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class Config:
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"""Configuration for this pydantic object."""
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extra = Extra.forbid
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@root_validator()
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def validate_environment(cls, values: Dict) -> Dict:
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"""Validate that api key and python package exists in environment."""
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dataherald_api_key = get_from_dict_or_env(
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values, "dataherald_api_key", "DATAHERALD_API_KEY"
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)
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values["dataherald_api_key"] = dataherald_api_key
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try:
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import dataherald
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except ImportError:
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raise ImportError(
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"dataherald is not installed. "
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"Please install it with `pip install dataherald`"
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)
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client = dataherald.Dataherald(api_key=dataherald_api_key)
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values["dataherald_client"] = client
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return values
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def run(self, prompt: str) -> str:
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"""Generate a sql query through Dataherald and parse result."""
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from dataherald.types.sql_generation_create_params import Prompt
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prompt_obj = Prompt(text=prompt, db_connection_id=self.db_connection_id)
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res = self.dataherald_client.sql_generations.create(prompt=prompt_obj)
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try:
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answer = res.sql
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if not answer:
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# We don't want to return the assumption alone if answer is empty
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return "No answer"
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else:
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return f"Answer: {answer}"
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except StopIteration:
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return "Dataherald wasn't able to answer it"
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