SQL-NEXUS: A Natural Language Database Query System Based on Agent Workflow

SQL-NEXUS is an innovative open-source project that converts natural language queries into database operations via an agent workflow. It aims to provide non-technical users with an intuitive database management experience and break the technical barriers of traditional SQL queries. The project supports mainstream databases such as MySQL, PostgreSQL, and SQLite, has multi-layer security protection mechanisms, and is suitable for scenarios like enterprise data analysis, education and training, and rapid prototyping.

In the data-driven era, database management is a core part of enterprises. However, traditional SQL queries have a high threshold for non-technical personnel, requiring mastery of complex syntax and database structure knowledge. SQL-NEXUS emerged to address this: using artificial intelligence and natural language processing technologies, it allows anyone to operate databases through simple English descriptions.

SQL-NEXUS adopts an agent workflow architecture, with core components including:

1. Natural Language Understanding Module: Parses user English queries, identifies entities, relationships, and operation intentions;
2. Agent Decision-Making Process: Intent recognition (determine query type), entity extraction (table name/field name/condition value), SQL generation, verification and execution;
3. Database Compatibility: Supports mainstream databases like MySQL, PostgreSQL, and SQLite.

In terms of technical implementation, SQL-NEXUS integrates large language models, uses prompt engineering and context learning to understand database architecture and generate accurate queries, and may adopt frameworks like LangChain or LlamaIndex to build the agent workflow. For security, it has built-in multi-layer protection: query verification (legality check before execution), permission control (restrict operations by role), and injection protection (prevent SQL injection).

Application scenarios include:

• Enterprise Data Analysis: Business analysts/product managers query using business language (e.g., "Show the top 10 products by sales last month");
• Education and Training: Students describe needs in natural language, and the system displays corresponding SQL to help understand syntax;
• Rapid Prototyping: Developers quickly verify data models and query logic through natural language, reducing SQL writing and debugging time.

SQL-NEXUS represents an important development direction for database interaction interfaces, promoting seamless interaction between natural language and structured data and lowering the threshold for data access democratization. The project is highly aligned with Text-to-SQL research, converting benchmark results from Spider, WikiSQL, etc., into practical open-source tools, and has value for the open-source community.

Possible future development directions for SQL-NEXUS:

• Support more complex nested queries and aggregation operations;
• Integrate visual result display;
• Provide conversational multi-turn interaction;
• Support more database systems. This project is worth the attention and trial of developers and enterprise users who want to simplify database operations and improve efficiency.