docs: Add javascript version of langgraph/sql-agent #1050
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Pull Request Overview
This PR adds the JavaScript/TypeScript version of the SQL agent tutorial, translating the Python implementation to JS. The tutorial demonstrates how to build a custom SQL agent using LangGraph that can interact with a SQLite database to answer questions.
Key changes:
- Adds JavaScript implementations alongside existing Python code using custom language fences (
:::pythonand:::js) - Includes JS-specific installation instructions with npm/yarn/pnpm examples
- Implements the complete SQL agent workflow in TypeScript, including database setup, tool creation, graph construction, and human-in-the-loop features
src/oss/langgraph/sql-agent.mdx
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| <Note> | ||
| The above implementation follows the [tool interrupt example](/oss/langgraph/add-human-in-the-loop#add-interrupts-to-any-tool) in the broader [human-in-the-loop](/oss/langgraph/add-human-in-the-loop) guide. Refer to that guide for details and alternatives. |
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Inconsistent link reference: Line 899 uses /oss/langgraph/add-human-in-the-loop while line 1003 uses /oss/langgraph/human-in-the-loop. These should point to the same guide. Please verify the correct path and update for consistency.
| The above implementation follows the [tool interrupt example](/oss/langgraph/add-human-in-the-loop#add-interrupts-to-any-tool) in the broader [human-in-the-loop](/oss/langgraph/add-human-in-the-loop) guide. Refer to that guide for details and alternatives. | |
| The above implementation follows the [tool interrupt example](/oss/langgraph/human-in-the-loop#add-interrupts-to-any-tool) in the broader [human-in-the-loop](/oss/langgraph/human-in-the-loop) guide. Refer to that guide for details and alternatives. |
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| We will use a handy SQL database wrapper available in the `@langchain/classic/sql_db` module to interact with the database. The wrapper provides a simple interface to execute SQL queries and fetch results: | ||
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| ```typescript | ||
| import { SqlDatabase } from "@langchain/classic/sql_db"; |
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I'm using this wrapper as we already have it. Did we want to modify this to directly use typeorm rather than pulling from classic?
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OK to pull from classic if it's doing enough work for users, alternatively better to use typeorm if the code foot print is sufficiently small.
cc @hntrl
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Yeah it's doing a bit of work. Mainly around getting db schema in dialect-agnostic way
Just translates the Python version of the langgraph sql-agent tutorial to js.
BaseMessage.toFormattedString()langchainjs#9228