Langchain sql database get table info. During this I am connecting AdventureWorks2017 database which has 60+ tables and tables Feb 26, 2024 · Here's how you can modify your code: from langchain_community. 264 is returning an empty list Dec 9, 2024 · langchain_community. At a high-level Jan 7, 2025 · 使用 SQL 和表格数据进行问答和 RAG（2）—通过 langchain_community. However, with accurate prompts, Gemini models can generate answers based on the data. SQL queries are generated correctly and able to connect to Feb 19, 2024 · I hope all's been well on your side! Yes, it is indeed possible to create an SQL agent in the latest version of LangChain to query tables on Google BigQuery. sql import SQLDatabaseChain from sqlalchemy import create_engine as . 1 day ago · How to deal with large databases when doing SQL question-answering In order to write valid queries against a database, we need to feed the model the table names, table Aug 5, 2025 · 自版本langchain-community==0. 3 to create an Agent which has access to multiple Chains, one of which is a Sql Aug 28, 2024 · The SQLDatabase class provides a get_table_info method that can be used to get column information as well as sample data from the table. Trying to use the BaseModel from Aug 6, 2025 · SQL Database ::: {. Make sure that your database connection permissions are always scoped as narrowly as 2 days ago · In this guide we'll go over prompting strategies to improve SQL query generation using createsqlquerychain. 16, SQLAlchemy 2. SparkSQL ¶ class langchain_community. SparkSQL(spark_session: Optional[SparkSession] = Jul 1, 2024 · I am working for a company that has some data restrictions. There are inherent risks in doing this. For each table, it generates a CREATE TABLE SQL command to provide a Apr 28, 2025 · The SQL Database Utility is a core component of the LangChain Community package that provides a wrapper around SQLAlchemy to facilitate seamless interaction with Oct 19, 2024 · The langchain_community. 204, Windoews, Python 3. Aug 5, 2025 · Documentation for LangChain. prompts import PromptTemplate Jul 28, 2025 · One of the most common types of databases that we can build Q&A systems for are SQL databases. Setup We'll need the Chinook sample DB for this example. We'll largely focus on methods for getting relevant database-specific information in your prompt. utilities. run (command [, fetch, include_columns, ]) Execute a Nov 30, 2023 · The SQLDatabase. Example 6 days ago · NOTE: For data-sensitive projects, you can specify return_direct=True in the SQLDatabaseChain initialization to directly return the output of the SQL query without any additional formatting. run Aug 1, 2023 · ) return self. I have mentioned the view name in the System Prompt and I have passed Oct 9, 2024 · 这将帮助您开始使用 SQL 数据库 工具包。有关所有 SQLDatabaseToolkit 功能和配置的详细文档，请访问 API 参考。 Reading an SQL database can be challenging for humans. get_table_info () method generates and send the SQL DML string such as the one below, this query returns a Dec 9, 2024 · Get information about specified tables. To mitigate risk of leaking sensitive Jul 1, 2024 · I'm trying to query a MySQL database using Python and Langchain. We will explore the steps necessary to build an intuitive, efficient, and intelligent NL2SQL model that can understand and Aug 5, 2025 · SQL This example demonstrates the use of the SQLDatabaseChain for answering questions over a SQL database. get_table_info method in LangChain generates and executes multiple SQL queries based on the tables present in the database. chains import create_sql_query_chain from Feb 22, 2024 · Description I am trying to create SQL queries using natural language and get them executed within Snowflake. sql In this tutorial, we will learn how to chat with a MySQL (or SQLite) database using 1 day ago · This will help you get started with the SQL Database toolkit. """ def __init__( self, engine: Engine, schema: Optional[str] = None, metadata: Optional[MetaData] = None, Oct 9, 2024 · 如何在进行 SQL 问答时更好地提示 在本指南中，我们将讨论提示策略，以改善使用 create_sql_query_chain 生成 SQL 查询。我们将主要关注在提示中获取相关的数据库特定信息 2 days ago · sql_db ======= sidebar_position: 3 title: 查询SQL数据库 我们可以使用Runnables来复制我们的SQLDatabaseChain。 %pip install --upgrade --quiet langchain langchain-openai 2 days ago · Building Q&A systems of SQL databases requires executing model-generated SQL queries. Get information about specified tables. run() command is just like the pre-prompt chain Feb 7, 2024 · I have used Langchain - create_sql_agent to generate SQL queries with a database and get the output result of the generated SQL query. The SQLDatabase class provides a getTableInfo method that 3 days ago · """SQLAlchemy wrapper around a database. The 6 days ago · Documentation for LangChain. In this tutorial, we will be connecting to PostgreSQL database and initiating a Jun 19, 2023 · System Info LangChain 0. Here is how my code looks like, it is Jun 27, 2024 · I am trying to access all data from pre-defined VIEWS in my MS SQL database using Langchain - SQLDatabaseToolkit and Langchain - create_sql_agent. When there May 16, 2024 · Let’s talk about ways Q&A chain can work on SQL database. """ from __future__ import annotations from typing import Any, Dict, Iterable, List, Literal, Optional, Sequence, Union import Apr 18, 2023 · SQL Chain example # This example demonstrates the use of the SQLDatabaseChain for answering questions over a database. from_uri ( oracle_connection_str, include_tables= ["EVR_REGION"], Dec 9, 2024 · class langchain_experimental. Please note that this is a workaround and might not work if 1 day ago · Documentation for LangChain. from_uri it takes a long time as I understand it reads all schema and 6 days ago · The SQLDatabase class provides a get_table_info method that can be used to get column information as well as sample data from the table. sql_database. To mitigate risk of leaking sensitive Aug 6, 2025 · For a transactional SQL database, if one of the table above contains millions of rows, the query might cause trouble to other applications using the same database. with engine. To mitigate risk of leaking sensitive Aug 7, 2025 · Querying a SQL DB We can replicate our SQLDatabaseChain with Runnables. 1: Use get_usable_table_names instead. This prevents the 1 day ago · This toolkit is useful for asking questions, performing queries, validating queries and more on a SQL database. I have been using the Langchain SQL agent with these imports: from langchain. """ from __future__ import annotations import re from typing import Any, Dict, Iterable, List, Literal, Optional, Sequence, Union import Feb 22, 2024 · Introduction # :bulb: Quick Links: Chinook Database for MySQL: Chinook_MySql. tool. The function create_sql_agent you've used in your code is Aug 30, 2024 · Using LangChain and OpenAI in conjunction with an SQL database can simplify the process of querying and analyzing data. Jul 28, 2025 · Large databases In order to write valid queries against a database, we need to feed the model the table names, table schemas, and feature values for it to query over. 15 db = SQLDatabase. When there Apr 28, 2025 · The SQL Database Utility provides a standardized interface for accessing various SQL database systems, enabling LangChain agents to query, retrieve schema information, Jul 9, 2025 · In this guide we'll go over prompting strategies to improve SQL query generation. get_usable_table_names() @property def table_info(self) -> str: """Information about all tables in the database. base. from langchain_core. Under the hood, LangChain Mar 11, 2024 · This blog post aims to guide you through a comprehensive journey to master NL2SQL using LangChain. This system will allow us to ask a question about the data in an SQL database and get back a natural language answer. I have two approaches in mind. agents import AgentType, Jul 9, 2024 · How to pass additional Inputs to SQLDatabaseChainDescription I'm trying to use Langchain 0. InfoSQLDatabaseTool [source] # Bases: Mar 12, 2024 · I am using the below code and for the same question, it return different results, is there any way to fix that? from langchain. Sep 5, 2024 · In this post I want to explore how one might go about prompt engineering to retrieve more accurate results incorporating a local SQL database, return a SQL how to use Apr 17, 2024 · Description While working with a Langchain use case, I encountered an issue where the console output of the SQL Server table structure did not include column comments. The SQLDatabase class provides a getTableInfo method that 1 day ago · """SQLAlchemy wrapper around a database. The chain is as Sep 14, 2023 · Hi All, I am working on one solution where requirement is to create SQL queries from natural language using gpt-turbo-3. Deprecated since version langchain-community==0. utilities import SQLDatabase from langchain_experimental. sql_db_list_tables, Dec 9, 2024 · *Security Note*: This chain generates SQL queries for the given database. We'll largely focus on methods for getting relevant database-specific information in your Aug 5, 2025 · 这将帮助您开始使用 SQL 数据库 工具包。有关所有 SQLDatabaseToolkit 功能和配置的详细文档，请查阅 API 参考。 SQLDatabaseToolkit 中的工具旨在与 SQL 数据库交互。 Dec 9, 2024 · # flake8: noqa """Tools for interacting with a SQL database. Dec 14, 2023 · In this configuration, LangChain will look for the table table1 in the int schema of your Azure SQL Database. The SQLDatabase class provides a getTableInfo method that Aug 5, 2025 · In this guide we'll go over the basic ways to create a Q&A chain and agent over a SQL database. sql_db_list_tables, This project integrates LangChain with a MySQL database to enable conversational interactions with the database. May 15, 2023 · When looking at the Cutomize prompt example, the subsequent db_chain. """ return self. The SQLDatabase class provides a getTableInfo method that can be used to get column Jun 29, 2023 · My team and I read the documentation and proceded to build the following block of code following the Custom Table Info SQL Langchain section of the LangChain docs. Get names of tables available. 1以来已弃用： 使用 get_usable_table_names 代替。 Aug 5, 2025 · For a transactional SQL database, if one of the table above contains millions of rows, the query might cause trouble to other applications using the same database. Aug 5, 2025 · Prompting strategies In this guide we'll go over prompting strategies to improve SQL query generation. engine import Result from Aug 6, 2025 · Large databases In order to write valid queries against a database, we need to feed the model the table names, table schemas, and feature values for it to query over. utilities 和 SQLAlchemy 来完成不同的查询和信息提取任务 1 day ago · In order to write valid queries against a database, we need to feed the model the table names, table schemas, and feature values for it to query over. (Langchain version Sep 28, 2024 · Executing SQL Commands: You can execute this command directly using Langchain. It leverages natural language processing (NLP) to query and manipulate database information using simple, 직접 작성시 table_info 와 더불어 설명가능한 column description 을 추가할 수 있습니다. 9. This setup allows you to interact with complex databases using natural language, making Sep 28, 2023 · Usually it is an iterative process until the Agent reaches the Final Answer or output. However, some features seem to return nothing, while others work. LangChain comes with a number of built-in chains and agents that are compatible with any SQL dialect supported by Aug 18, 2023 · Based on the information you've provided, it seems like you're experiencing an issue where the get_usable_table_names() method from the SQLDatabase object in LangChain version 0. get_table_info() def Jun 11, 2024 · To manually override the table_info variable provided by the database object every time a new question is asked without re-initializing the database object, you can directly set 1 day ago · The SQLDatabase class provides a get_table_info method that can be used to get column information as well as sample data from the table. For talking to SQL databases, it uses the SQLAlchemy Core Apr 17, 2023 · I'd like to be able to run a query via SQLDatabaseSequentialChain or SQLDatabaseChain involving multiple tables living in multiple different schemas, but it seems that as it is, the code is set up 20 hours ago · SQLDatabaseChain # class langchain_experimental. These systems will allow us to ask a question about the data in a SQL Jul 13, 2023 · 概要 本文讲述如何使用 SQLDatabaseChain 通过 SQL 数据库回答问题。 在底层， LangChain 使用 SQLAlchemy 连接到 SQL 数据库。 因此， SQLDatabaseChain 可以与 Jun 14, 2025 · Documentation for LangChain. The SQLDatabase class provides a getTableInfo method that Aug 5, 2025 · 使LLM系统能够查询结构化数据在性质上可能与非结构化文本数据有所不同。后者通常生成可针对向量数据库进行搜索的文本，而结构化数据的方法通常是让LLM编写并执 6 days ago · Security Security Notice This chain generates SQL queries for the given database. 2. Dec 9, 2024 · class langchain_community. SQLDatabase. Make sure that your database connection permissions are always scoped as narrowly as Oct 18, 2023 · As for how LangChain handles SQL views in comparison to tables in the database, I wasn't able to find specific information within the repository. sql. connect() as conn: conn. 5 LLM. 2 days ago · Building Q&A systems of SQL databases requires executing model-generated SQL queries. May 9, 2023 · With LangChain, you can easily converse with your database and obtain precise responses in real-time, just as if you were talking to a close friend. spark_sql. For detailed documentation of all SQLDatabaseToolkit features and configurations head to the API reference. SQLDatabaseChain [source] # Bases: Chain Chain for interacting with SQL Database. jsSecurity Security Notice This class generates SQL queries for the given database. First install typeorm: Aug 28, 2024 · We are using the LangChain SQL agent and it is working perfectly fine. When there are many tables, columns, and/or high-cardinality columns, it Aug 21, 2023 · A step-by-step guide to building a LangChain enabled SQL database question answering agent. However, in general, SQL views Mar 11, 2023 · NOTE: For data-sensitive projects, you can specify return_direct=True in the SQLDatabaseChain initialization to directly return the output of the SQL query without any May 15, 2024 · Like different groups of people, different databases might speak in different dialects; LangChain’s Text-to-SQL tutorial relies on a popular Python library called SQLAlchemy, which provides a Jun 15, 2023 · When we ran our query for our database chain, our sample question was full of information and basically checked off every box the LLM needed to construct a SQL query. 1 day ago · Return db context that you may want in agent prompt. execute(""" CREATE TABLE users ( id INTEGER PRIMARY KEY, name TEXT NOT NULL Dec 8, 2023 · When utilizing custom_table_info in the sqldatabase instance while employing the create_sql_agent function, it appears that there is an issue where it disregards the Jun 6, 2024 · Description I am creating a text to sql chain to generate sql queries to query a database. 0. We'll largely focus on methods for getting relevant database-specific Aug 1, 2023 · class SQLDatabase: """SQLAlchemy wrapper around a database. SQLDatabaseSequentialChain[source] ¶ Bases: Chain Chain for querying SQL database that is a sequential chain. The SQLDatabase class provides a getTableInfo method that can be used to get column Jun 14, 2025 · Security Security Notice This chain generates SQL queries for the given database. """ from typing import Any, Dict, Optional, Sequence, Type, Union from sqlalchemy. tools. Through the use of the Gemini API, you will be able retrieve necessary 3 days ago · InfoSQLDatabaseTool # class langchain_community. The only thing is SQLDatabase. sql Chinook Database for SQLite: Chinook_Sqlite. The SQLDatabase class provides a get_table_info method that can be used to get column Oct 19, 2024 · 1 I have a PostgreSQL DB for which I would like to use langchain to query tables (and views) that are not in the default "public" schema. In this article, I will show you how we can use LangChain Agent and Azure OpenAI gpt-35-turbo model to query your SQL database using Jul 1, 2024 · I'm trying to query a MySQL database using Python and Langchain. InfoSQLDatabaseTool [source] ¶ Bases: BaseSQLDatabaseTool, BaseTool Tool for getting metadata about a SQL database. Setup This example uses Chinook database, which is a sample database available for SQL Server, Jan 3, 2024 · I am trying to build a langchain SQL database agent where I want to query only one view for now. This example uses Chinook database, which is a sample Oct 9, 2024 · 使大型语言模型系统能够查询结构化数据与查询非结构化文本数据在质上是不同的。在后者中，生成可以在向量数据库中搜索的文本是常见的，而对于结构化数据，通常是让大型语言模型在领域特定语言（DSL）中编写和执行查 Sep 7, 2023 · Modifying the LangChain source code: You could add a new parameter to the SQLDatabase class that specifies which columns to ignore, and then modify the get_table_info and _get_sample_rows methods to exclude Aug 6, 2025 · [docs] def create_sql_query_chain( llm: BaseLanguageModel, db: SQLDatabase, prompt: Optional[BasePromptTemplate] = None, k: int = 5, ) -> Runnable[Union[SQLInput, Mar 13, 2023 · LLMs can write SQL, but they are often prone to making up tables, making up fields, and generally just writing SQL that if executed against your database would not actually 4 days ago · In this guide we'll go over prompting strategies to improve SQL query generation. callout-note} The SQLDatabase adapter utility is a wrapper around a database connection. zwqyds hbdytz qssue ebcaagw zlh ajwlyqwq zfbykrv zjs icjh rihft