langchain/templates/sql-research-assistant/README.md

# sql-research-assistant

This package does research over a SQL database

## Usage

This package relies on multiple models, which have the following dependencies:

- OpenAI: set the `OPENAI_API_KEY` environment variables
- Ollama: [install and run Ollama](https://python.langchain.com/docs/integrations/chat/ollama)
- llama2 (on Ollama): `ollama pull llama2` (otherwise you will get 404 errors from Ollama)

To use this package, you should first have the LangChain CLI installed:

```shell
pip install -U langchain-cli
```

To create a new LangChain project and install this as the only package, you can do:

```shell
langchain app new my-app --package sql-research-assistant
```

If you want to add this to an existing project, you can just run:

```shell
langchain app add sql-research-assistant
```

And add the following code to your `server.py` file:
```python
from sql_research_assistant import chain as sql_research_assistant_chain

add_routes(app, sql_research_assistant_chain, path="/sql-research-assistant")
```

(Optional) Let's now configure LangSmith. 
LangSmith will help us trace, monitor and debug LangChain applications. 
LangSmith is currently in private beta, you can sign up [here](https://smith.langchain.com/). 
If you don't have access, you can skip this section


```shell
export LANGCHAIN_TRACING_V2=true
export LANGCHAIN_API_KEY=<your-api-key>
export LANGCHAIN_PROJECT=<your-project>  # if not specified, defaults to "default"
```

If you are inside this directory, then you can spin up a LangServe instance directly by:

```shell
langchain serve
```

This will start the FastAPI app with a server is running locally at 
[http://localhost:8000](http://localhost:8000)

We can see all templates at [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs)
We can access the playground at [http://127.0.0.1:8000/sql-research-assistant/playground](http://127.0.0.1:8000/sql-research-assistant/playground)  

We can access the template from code with:

```python
from langserve.client import RemoteRunnable

runnable = RemoteRunnable("http://localhost:8000/sql-research-assistant")
```