MySQL MCP Server

MySQL MCP Server

The MySQL Model Context Protocol (MCP) Server is a tool that allows you to connect to a local MySQL database and allow large language models (LLMs) to execute SQL queries against it.

Requirements

• Node.js : 20.0.0 or later
• MySQL : MySQL or MariaDB server version 5.7 or later

function

• Run MySQL queries : Run SQL queries directly from LLM
• Obtaining database information : List of databases, list of tables, confirm table structure
• MCP Compliant : Supports Model Context Protocol and can be integrated with LLM
• stdio communication : communicate with LLM using standard input/output, no port binding
• Save connection information : Save database connection information locally and reuse it

Installation and Usage

Temporary execution in NPX

option

Save and reuse connection information

MySQL MCP Server locally saves information about databases that it has successfully connected to, so that it can automatically reuse the connection information the next time it starts. Saved connection information is stored in .mysql-mcp-connections.json file in the user's home directory.

Connection information includes:

• Hostname
• Port number
• Username
• password
• Database name (if set)

Using configuration files

You can also configure the connection information using a configuration file (in JSON format):

If you use a configuration file:

Communication method

MySQL MCP Server operates in "stdio" mode according to the MCP (Model Context Protocol), which means it does not bind to a specific port but communicates via standard input and output. This has the following advantages:

1. Avoid port conflicts : No specific ports are used, so no port conflict issues occur
2. Improved security : No network communication is used, reducing the risk of network-level attacks
3. Simple Inter-Process Communication : Simplified communication with LLM

Important points to note

• In stdio mode, messages are sent in JSON format.
• You must send one JSON message per line
• Error information and connection logs are output to standard error (stderr).

MCP Tools Provided

Database Connection Management

SQL Query Operations

Connection Management Function

MySQL MCP Server allows you to separate server startup and database connections. This approach provides the following benefits:

1. Start without connection information : The server can be started without database connection information.
2. Multiple database connections : You can switch connections to different databases after the server is started.
3. Simple installation : just run npx -y https://github.com/yuki777/mysql-mcp-server

How to use Connection Management

1. Start the server without auto-connect :
   npx -y https://github.com/yuki777/mysql-mcp-server
2. Connect to the database using the connection tool :
   { "type": "tool_call", "request_id": "req_1", "tool": "connect_database", "arguments": { "host": "localhost", "port": 3306, "user": "root", "password": "your_password", "database": "your_db" } }
3. Check your connection status :
   { "type": "tool_call", "request_id": "req_2", "tool": "get_connection_status", "arguments": {} }
4. Loss of connection :
   { "type": "tool_call", "request_id": "req_3", "tool": "disconnect_database", "arguments": {} }

Test script

The repository contains a test script called test-connection-management.js , which you can use to test the connection management functionality:

Developer Information

Setting up your development environment

Build

license

ISC

contribution

Bug reports, feature requests and pull requests are welcome.