MySQL SSE MCP server

The MySQL Query Server is an MCP-based solution for real-time database operations using Server-Sent Events (SSE). It provides secure access to MySQL databases with features like connection pooling, transaction management, SQL risk control, and database isolation security.

Installation

Docker Installation (Recommended)

The easiest way to get started is using Docker:

# Pull the image
docker pull mangooer/mysql-mcp-server-sse:latest

# Run the container
docker run -d \
  --name mysql-mcp-server-sse \
  -e HOST=0.0.0.0 \
  -e PORT=3000 \
  -e MYSQL_HOST=your_mysql_host \
  -e MYSQL_PORT=3306 \
  -e MYSQL_USER=your_mysql_user \
  -e MYSQL_PASSWORD=your_mysql_password \
  -e MYSQL_DATABASE=your_database \
  -p 3000:3000 \
  mangooer/mysql-mcp-server-sse:latest

For Windows PowerShell:

docker run -d `
  --name mysql-mcp-server-sse `
  -e HOST=0.0.0.0 `
  -e PORT=3000 `
  -e MYSQL_HOST=your_mysql_host `
  -e MYSQL_PORT=3306 `
  -e MYSQL_USER=your_mysql_user `
  -e MYSQL_PASSWORD=your_mysql_password `
  -e MYSQL_DATABASE=your_database `
  -p 3000:3000 `
  mangooer/mysql-mcp-server-sse:latest

Installation from Source

1. Install dependencies:

   pip install -r requirements.txt
   

2. Configure environment variables:

   • Copy .env.example to .env
   • Modify the values according to your setup

3. Start the server:

   python -m src.server
   

The server will be available at: http://127.0.0.1:3000/sse

Configuration

The server can be configured using environment variables:

MySQL 8.0 Authentication Support

The system supports MySQL 8.0's authentication mechanisms. MySQL 8.0 defaults to using the caching_sha2_password authentication plugin for enhanced security.

Authentication Plugin Comparison

Configuration Recommendations

For production:

DB_AUTH_PLUGIN=caching_sha2_password

For development:

DB_AUTH_PLUGIN=mysql_native_password

When using caching_sha2_password, the cryptography package is required:

pip install cryptography

Database Isolation Security

The system provides robust database isolation to prevent cross-database access and ensure data security.

Access Levels

Enabling Database Isolation

# Docker with strict mode
docker run -d \
  -e MYSQL_DATABASE=your_database \
  -e ENABLE_DATABASE_ISOLATION=true \
  -e DATABASE_ACCESS_LEVEL=strict \
  mangooer/mysql-mcp-server-sse:latest

# Auto-enable in production
docker run -d \
  -e ENV_TYPE=production \
  -e MYSQL_DATABASE=your_database \
  mangooer/mysql-mcp-server-sse:latest

Security Effects:

• ✅ Blocks SHOW DATABASES
• ✅ Blocks SELECT * FROM mysql.user
• ✅ Blocks SHOW TABLES FROM other_db
• ✅ Allows current database operations

Important: Production environment (ENV_TYPE=production) automatically enables database isolation with restricted mode.

Troubleshooting

Common Issues and Solutions

Q: DELETE operation not working?
A: Check for WHERE condition. DELETE without WHERE is high risk (CRITICAL), must be allowed in ALLOWED_RISK_LEVELS.

Q: How to customize sensitive fields?
A: Set SENSITIVE_INFO_FIELDS, e.g. SENSITIVE_INFO_FIELDS=password,token

Q: How to enable database isolation?
A: Set ENABLE_DATABASE_ISOLATION=true and DATABASE_ACCESS_LEVEL=strict, or use ENV_TYPE=production for auto-enable.

Q: Cannot query system tables after enabling database isolation?
A: strict mode blocks system table access. Use restricted mode or verify if system table access is actually needed.

Q: limit parameter error?
A: limit must be a non-negative integer.

How to add this MCP server to Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > MCP and click "Add new global MCP server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "cursor-rules-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "cursor-rules-mcp"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explictly ask the agent to use the tool by mentioning the tool name and describing what the function does.