Pg MCP Server
What is PG_MCP_SERVER?
A specialized server that bridges PostgreSQL/PostGIS databases with Large Language Models (LLMs). It intelligently manages database schema information to optimize context usage when working with LLMs.How to use PG_MCP_SERVER?
The server connects to your PostgreSQL database, pre-processes schema information, and provides structured data to LLMs through MCP protocol. It supports both standard and PostGIS-enhanced PostgreSQL databases.Use Cases
Ideal for applications where LLMs need to interact with PostgreSQL databases, especially with spatial data (PostGIS) or vector data (PgVector). Useful for data analysis, natural language query interfaces, and automated database documentation.Key Features
PostgreSQL Integration
Full support for PostgreSQL database operations and schema management
PostGIS Support
Special handling for spatial data types and operations (✅ Supported)
PgVector Support
Support for vector similarity operations (✅ Supported)
Schema Pre-processing
Pre-loads table structures to optimize LLM context usage
Advantages
Reduces LLM token usage by pre-processing schema information
Supports both standard and spatial database operations
Implements security best practices with role-based access
Provides data isolation through temp schema
Limitations
Requires initial database configuration
Temp schema management needs improvement
PgRouting support not yet implemented (⭕)
Limited to PostgreSQL database systems
Getting Started
Database Setup
Create a dedicated database role with appropriate permissions
Server Configuration
Set the database connection string in main.go or via .env file
Run the Server
Start the server using Docker or directly via Go
Usage Scenarios
Natural Language Query Interface
Allow users to query spatial data using natural language which gets converted to proper PostGIS queries
Database Documentation
Automatically generate database schema documentation for new team members
Frequently Asked Questions
Why do I need to create a special database role?
What's the purpose of the temp schema?
Can I use this with other database systems?
Additional Resources
go-mcp Project
The MCP implementation used by this server
Original Inspiration
Project that inspired the PostGIS and PgVector descriptions
中文文档
Chinese language documentation

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