DEV Community

ahsan2014s
ahsan2014s

Posted on

MCP Server: Integrate Database with AI

#mcp #ai #database #postgres

The Model Context Protocol (MCP) is an open standard developed by Anthropic to facilitate seamless integration between AI models and external data sources like your database (or API and other services too). It provides a standardized way for AI models like Claude to communicate with various tools, APIs, and data sources, enabling more powerful and flexible AI applications.

An MCP server is a program that implements the Model Context Protocol. It acts as a bridge between AI model and external systems. These servers expose specific capabilities—like file access, database connections, or API integrations—to AI models in a secure, standardized way.

Imagine you have a streaming platform. Now you want to optimize user's search queries. Your database stores all the metadatas such as title, description, publishing date of a video. If your AI has the access to your database then the AI can find the most relevant video according to user's search.

Setting Up an MCP Server

To set up a basic MCP server using Python, follow these steps:

1. Install Python and pip

Ensure you have Python 3.7 or higher and pip installed on your system.

2. Install the Anthropic MCP Server SDK

Open your terminal or command prompt and run:

pip install anthropic-mcp-server
Enter fullscreen mode Exit fullscreen mode

3. Create a Simple MCP Server

Create a new Python file, for example, simple_mcp_server.py, and add the following code:

from anthropic_mcp_server import MCPServer, RouteHandler, Request, Response

class SimpleRouteHandler(RouteHandler):
    async def handle_request(self, request: Request) -> Response:
        return Response(
            body_type="text",
            body={"text": "Hello from your simple MCP server!"},
        )

async def main():
    server = MCPServer()
    server.add_route("/simple-context", SimpleRouteHandler())
    await server.start()

if __name__ == "__main__":
    import asyncio
    asyncio.run(main())
Enter fullscreen mode Exit fullscreen mode

This code sets up a basic MCP server with a single route /simple-context that returns a simple text response.

4. Run Your MCP Server

Navigate to the directory containing your simple_mcp_server.py file and run:

python simple_mcp_server.py
Enter fullscreen mode Exit fullscreen mode

Your MCP server will start, typically on http://localhost:8080, ready to serve context via the Model Context Protocol.

5. Test Your MCP Server

To confirm that your MCP server is functioning correctly, open your web browser or use a tool like curl to access:

http://localhost:8080/simple-context
Enter fullscreen mode Exit fullscreen mode

You should receive a JSON response:

{"type":"text","text":"Hello from your simple MCP server!"}
Enter fullscreen mode Exit fullscreen mode

This confirms that your basic MCP server is up and running and capable of serving context through the Model Context Protocol.

Now you're ready

After setting up your basic MCP server, you can explore integrating it with various data sources, such as databases, APIs, and files. You can also delve into request handling, parameter processing, and implementing robust security considerations. Integrating your MCP server with AI assistants and large language model applications can further enhance their capabilities by providing real-time context.

Setting Up an MCP Server for PostgreSQL

To connect a PostgreSQL database to an MCP server:

1. Install the Postgres MCP Server

Ensure you have the Postgres MCP server installed. You can add it using the Claude CLI:

claude mcp add postgres-server /path/to/postgres-mcp-server --connection-string "postgresql://user:pass@localhost:5432/mydb"
Enter fullscreen mode Exit fullscreen mode

Replace /path/to/postgres-mcp-server with the actual path to your Postgres MCP server executable, and update the connection string with your database credentials.

2. Start the MCP Server

Run the MCP server to establish the connection between Claude and your PostgreSQL database.

3. Query Your Database with Claude

Once connected, you can interact with your database using natural language prompts in Claude:

  • "Describe the schema of our users table."
  • "What are the most recent orders in the system?"
  • "Show me the relationship between customers and invoices."

Claude will translate these prompts into SQL queries, execute them, and present the results. Note that the Postgres MCP server provides read-only access for safety.

Customizing the MCP Server for Other Databases

If you're using a different database system, you can build a custom MCP server:

1. Implement the MCP Server

Use the MCP server SDK to create a server that connects to your database. Ensure it adheres to the MCP specifications;

2. Define Routes and Handlers

Set up routes that handle specific queries or actions. For example, a route to fetch user data or order details.

3. Secure Your Server

Implement authentication and authorization to protect your data. Ensure that only authorized AI models or users can access specific routes or data.

4. Test the Integration

Before deploying, thoroughly test the MCP server to ensure it correctly handles queries and returns accurate data.

Best Practices

  • Use Read-Only Access: Limit the MCP server's permissions to read-only to prevent unintended data modifications.
  • Secure Credentials: Store database credentials securely, using environment variables or secure credential stores.
  • Monitor Usage: Implement logging and monitoring to track access patterns and detect any anomalies.
  • Regular Updates: Keep your MCP server and dependencies updated.

Top comments (0)