MariaDB / MySQL Database Access MCP Server

This MCP server provides access to MariaDB / MySQL databases.

It allows you to:

• List available databases
• List tables in a database
• Describe table schemas
• Execute SQL queries

Security Features

• Read-only access Default: SELECT, SHOW, DESCRIBE, and EXPLAIN
• Query validation: Prevents SQL injection and blocks any data modification attempts
• Query timeout: Prevents long-running queries from consuming resources
• Row limit: Prevents excessive data return

Installation

Option 1: Install from NPM (Recommended)

# Install globally
npm install -g mariadb-mcp-server

# Or install locally in your project
npm install mariadb-mcp-server

Option 2: Build from Source

# Clone the repository
git clone https://github.com/rjsalgado/mariadb-mcp-server.git
cd mariadb-mcp-server

# Install dependencies and build
npm install
npm run build

2. Configure environment variables

The server requires the following environment variables:

• MARIADB_HOST: Database server hostname
• MARIADB_PORT: Database server port (default: 3306)
• MARIADB_USER: Database username
• MARIADB_PASSWORD: Database password
• MARIADB_DATABASE: Default database name (optional)
• MARIADB_ALLOW_INSERT: false
• MARIADB_ALLOW_UPDATE: false
• MARIADB_ALLOW_DELETE: false
• MARIADB_TIMEOUT_MS: 10000
• MARIADB_ROW_LIMIT: 1000

3. Add to MCP settings

Add the following configuration to your MCP settings file:

If you installed via npm (Option 1):

{
  "mcpServers": {
    "mariadb": {
      "command": "npx",
      "args": ["mariadb-mcp-server"],
      "env": {
        "MARIADB_HOST": "your-host",
        "MARIADB_PORT": "3306",
        "MARIADB_USER": "your-user",
        "MARIADB_PASSWORD": "your-password",
        "MARIADB_DATABASE": "your-database",
        "MARIADB_ALLOW_INSERT": "false",
        "MARIADB_ALLOW_UPDATE": "false",
        "MARIADB_ALLOW_DELETE": "false",
        "MARIADB_TIMEOUT_MS": "10000",
        "MARIADB_ROW_LIMIT": "1000",
      },
      "disabled": false,
      "autoApprove": []
    }
  }
}

If you built from source (Option 2):

{
  "mcpServers": {
    "mariadb": {
      "command": "node",
      "args": ["/path/to/mariadb-mcp-server/dist/index.js"],
      "env": {
        "MARIADB_HOST": "your-host",
        "MARIADB_PORT": "3306",
        "MARIADB_USER": "your-user",
        "MARIADB_PASSWORD": "your-password",
        "MARIADB_DATABASE": "your-default-database",
        "MARIADB_ALLOW_INSERT": "false",
        "MARIADB_ALLOW_UPDATE": "false",
        "MARIADB_ALLOW_DELETE": "false",
        "MARIADB_TIMEOUT_MS": "10000",
        "MARIADB_ROW_LIMIT": "1000",
      },
      "disabled": false,
      "autoApprove": []
    }
  }
}

Available Tools

"server_name": "mariadb" or "server_name": "mysql"

list_databases

Lists all accessible databases on the MariaDB / MySQL server. Parameters: None

Example:

{
  "server_name": "mariadb",
  "tool_name": "list_databases",
  "arguments": {}
}

list_tables

Lists all tables in a specified database.

Parameters:

• database (optional): Database name (uses default if not specified)

Example:

{
  "server_name": "mariadb",
  "tool_name": "list_tables",
  "arguments": {
    "database": "my_database"
  }
}

describe_table

Shows the schema for a specific table.

Parameters:

• database (optional): Database name (uses default if not specified)
• table (required): Table name

Example:

{
  "server_name": "mariadb",
  "tool_name": "describe_table",
  "arguments": {
    "database": "my_database",
    "table": "my_table"
  }
}

execute_query

Executes a SQL query.

Parameters:

• query (required): SQL query
• database (optional): Database name (uses default if not specified)

Example:

{
  "server_name": "mariadb",
  "tool_name": "execute_query",
  "arguments": {
    "database": "my_database",
    "query": "SELECT * FROM my_table LIMIT 10"
  }
}

Testing

The server includes test scripts to verify functionality with your MariaDB / MySQL setup:

1. Setup Test Database

This script creates a test database, table, and sample data:

# Set your MariaDB / MySQL credentials as environment variables
export MARIADB_HOST=localhost
export MARIADB_PORT=3306
export MARIADB_USER=your_username
export MARIADB_PASSWORD=your_password
export MARIADB_ALLOW_INSERT: false
export MARIADB_ALLOW_UPDATE: false
export MARIADB_ALLOW_DELETE: false
export MARIADB_TIMEOUT_MS=10000
export MARIADB_ROW_LIMIT=1000


# Run the setup script
npm run test:setup

2. Test MCP Tools

This script tests each of the MCP tools against the test database:

####
# Set your MariaDB / MySQL credentials as environment variables
MARIADB_HOST=localhost
MARIADB_PORT=3306
MARIADB_USER=your_username
MARIADB_PASSWORD=your_password
MARIADB_DATABASE=mcp_test_db
MARIADB_ALLOW_INSERT=false
MARIADB_ALLOW_UPDATE=false
MARIADB_ALLOW_DELETE=false
MARIADB_TIMEOUT_MS=10000
MARIADB_ROW_LIMIT=1000
MARIADB_DEBUG_SQL=true
####
export MARIADB_HOST=localhost
export MARIADB_PORT=3306
export MARIADB_USER=your_username
export MARIADB_PASSWORD=your_password
export MARIADB_DATABASE=mcp_test_db
export MARIADB_ALLOW_INSERT: false
export MARIADB_ALLOW_UPDATE: false
export MARIADB_ALLOW_DELETE: false
export MARIADB_TIMEOUT_MS=10000
export MARIADB_ROW_LIMIT=1000


# Run the tools test script
npm run test:tools

3. Run All Tests

To run both setup and tool tests:

# Set your MariaDB / MySQL credentials as environment variables
export MARIADB_HOST=localhost
export MARIADB_PORT=3306
export MARIADB_USER=your_username
export MARIADB_PASSWORD=your_password
export MARIADB_ALLOW_INSERT: false
export MARIADB_ALLOW_UPDATE: false
export MARIADB_ALLOW_DELETE: false
export MARIADB_TIMEOUT_MS=10000
export MARIADB_ROW_LIMIT=1000

# Run all tests
npm test

Troubleshooting

If you encounter issues:

1. Check the server logs for error messages
2. Verify your MariaDB/MySQL credentials and connection details
3. Ensure your MariaDB/MySQL user has appropriate permissions
4. Check that your query is read-only and properly formatted

Inspiration https://github.com/dpflucas/mysql-mcp-server

License

This project is licensed under the MIT License - see the LICENSE file for details.