Text-to-SQL Query Generator: Large Model-Based Natural Language Database Interaction

This article introduces an open-source tool called Text-to-SQL Queries Generator, which uses large language models to convert natural language into SQL queries, helping non-technical users easily interact with databases. The tool combines schema-aware prompts (providing database structure information) and database validation mechanisms (syntax checking, semantic validation, etc.) to improve the accuracy and executability of generated SQL. The project is maintained by Danish08654, with source code hosted on GitHub, and was released on June 15, 2026.

Database interaction usually requires mastery of SQL, which is a barrier for non-technical roles (such as product managers, business operations), leading them to rely on development teams or pre-set reports. Text-to-SQL technology aims to break this barrier, and its technical evolution has gone through three stages: early rule-based methods (poor scalability), neural network-based Seq2Seq models (limited by data quality), and large language model-based methods (GPT/LLaMA, etc., with strong code generation capabilities).

The core features of the tool include: 1. Large model-driven: understands complex semantics, maintains context, and generates complex queries; 2. Schema-aware prompts: provides database table structure, relationships, constraints, and sample data as context to the model, avoiding field/table reference errors; 3. Database validation mechanism: syntax checking, semantic validation, execution testing, error feedback, forming a generation-validation-feedback loop to improve reliability.

Technical implementation includes: 1. Prompt engineering strategies: define system roles (SQL expert), clearly present Schema, provide few-shot examples, standardize output format; 2. Multi-turn dialogue support: maintain dialogue history, resolve anaphora, support query modification; 3. Security considerations: prevent SQL injection, data leakage, resource consumption risks, requiring an additional security layer.

The tool is suitable for multiple scenarios: 1. Business data analysis: business personnel query sales data, user behavior, etc.; 2. Data exploration: analysts quickly understand dataset characteristics; 3. Report generation assistance: generate basic queries for engineers to optimize; 4. Educational learning: help SQL beginners understand the mapping from natural language to SQL.

Existing challenges include: 1. Ambiguity handling: natural language ambiguity requires user clarification or statistical inference; 2. Accuracy of complex queries: the accuracy of generating complex SQL such as multi-table joins and subqueries decreases; 3. Adaptability to Schema changes: need to timely perceive database structure updates; 4. Dialect differences: need to adapt to the syntax of different databases (MySQL, PostgreSQL, etc.).

Implementation recommendations: 1. Data preparation: prepare clear database documents, representative query samples, user permission policies; 2. Progressive launch: shadow mode (manual verification) → read-only queries → whitelisted tables → full opening; 3. Continuous optimization: collect feedback, expand example library, fine-tune models, establish quality evaluation system.

This tool balances ease of use and accuracy, providing an open-source solution to lower the threshold of data querying, improve business self-service analysis capabilities, and reduce the burden on data teams. In the future, with the development of large models and multimodal technologies, Text-to-SQL systems may support voice interaction and conversational analysis combined with visualization, accelerating data democratization and enabling more people to gain data insights.