DBHub is a universal database gateway implementing the Model Context Protocol (MCP) server interface.

[!NOTE]
Brought to you by Bytebase, open-source database DevSecOps platform.

cursor://anysphere.cursor-deeplink/mcp/install?name=dbhub&config=eyJjb21tYW5kIjoibnB4IEBieXRlYmFzZS9kYmh1YiIsImVudiI6eyJUUkFOU1BPUlQiOiJzdGRpbyIsIkRTTiI6InBvc3RncmVzOi8vdXNlcjpwYXNzd29yZEBsb2NhbGhvc3Q6NTQzMi9kYm5hbWU%2Fc3NsbW9kZT1kaXNhYmxlIiwiUkVBRE9OTFkiOiJ0cnVlIn19

DBHub is a universal database gateway implementing the Model Context Protocol (MCP) server interface. This gateway allows MCP-compatible clients to connect to and explore different databases.

 +------------------+    +--------------+    +------------------+
 |                  |    |              |    |                  |
 |                  |    |              |    |                  |
 |  Claude Desktop  +--->+              +--->+    PostgreSQL    |
 |                  |    |              |    |                  |
 |  Claude Code     +--->+              +--->+    SQL Server    |
 |                  |    |              |    |                  |
 |  Cursor          +--->+    DBHub     +--->+    SQLite        |
 |                  |    |              |    |                  |
 |  Other Clients   +--->+              +--->+    MySQL         |
 |                  |    |              |    |                  |
 |                  |    |              +--->+    MariaDB       |
 |                  |    |              |    |                  |
 |                  |    |              |    |                  |
 +------------------+    +--------------+    +------------------+
      MCP Clients           MCP Server             Databases

Demo HTTP Endpoint

https://demo.dbhub.ai/message connects a sample employee database. You can point Cursor or MCP Inspector to it to see it in action.

Supported Matrix# Database Resources

Database Tools

Prompt Capabilities

Installation# Docker

docker run --rm --init \
- -name dbhub \
- -publish 8080:8080 \
   bytebase/dbhub \
- -transport http \
- -port 8080 \
- -dsn "postgres://user:password@localhost:5432/dbname?sslmode=disable"

docker run --rm --init \
- -name dbhub \
- -publish 8080:8080 \
   bytebase/dbhub \
- -transport http \
- -port 8080 \
- -demo

NPM

npx @bytebase/dbhub --transport http --port 8080 --dsn "postgres://user:password@localhost:5432/dbname?sslmode=disable"

# Demo mode with sqlite sample employee database
npx @bytebase/dbhub --transport http --port 8080 --demo

npx @bytebase/dbhub --transport http --port 8080 --demo

Note: The demo mode includes a bundled SQLite sample "employee" database with tables for employees, departments, salaries, and more.

Claude Desktop

• Claude Desktop only supports stdio transport https://github.com/orgs/modelcontextprotocol/discussions/16

// claude_desktop_config.json
{
  "mcpServers": {
    "dbhub-postgres-docker": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "bytebase/dbhub",
        "--transport",
        "stdio",
        "--dsn",
        // Use host.docker.internal as the host if connecting to the local db
        "postgres://user:[email protected]:5432/dbname?sslmode=disable"
      ]
    },
    "dbhub-postgres-npx": {
      "command": "npx",
      "args": [
        "-y",
        "@bytebase/dbhub",
        "--transport",
        "stdio",
        "--dsn",
        "postgres://user:password@localhost:5432/dbname?sslmode=disable"
      ]
    },
    "dbhub-demo": {
      "command": "npx",
      "args": ["-y", "@bytebase/dbhub", "--transport", "stdio", "--demo"]
    }
  }
}

Claude Code

Check https://docs.anthropic.com/en/docs/claude-code/mcp

Cursor

cursor://anysphere.cursor-deeplink/mcp/install?name=dbhub&config=eyJjb21tYW5kIjoibnB4IEBieXRlYmFzZS9kYmh1YiIsImVudiI6eyJUUkFOU1BPUlQiOiJzdGRpbyIsIkRTTiI6InBvc3RncmVzOi8vdXNlcjpwYXNzd29yZEBsb2NhbGhvc3Q6NTQzMi9kYm5hbWU%2Fc3NsbW9kZT1kaXNhYmxlIiwiUkVBRE9OTFkiOiJ0cnVlIn19

• Cursor supports both stdio and http.
• Follow Cursor MCP guide and make sure to use Agent mode.

Usage# Read-only Mode

You can run DBHub in read-only mode, which restricts SQL query execution to read-only operations:

npx @bytebase/dbhub --readonly --dsn "postgres://user:password@localhost:5432/dbname"

In read-only mode, only readonly SQL operations are allowed.

This provides an additional layer of security when connecting to production databases.

SSL Connections

You can specify the SSL mode using the sslmode parameter in your DSN string:

SSL Mode Options:

• sslmode=disable: All SSL/TLS encryption is turned off. Data is transmitted in plaintext.
• sslmode=require: Connection is encrypted, but the server's certificate is not verified. This provides protection against packet sniffing but not against man-in-the-middle attacks. You may use this for trusted self-signed CA.

Without specifying sslmode, most databases default to certificate verification, which provides the highest level of security.

Example usage:

postgres://user:password@localhost:5432/dbname?sslmode=disable

# Require SSL without certificate verification
postgres://user:password@localhost:5432/dbname?sslmode=require

# Standard SSL with certificate verification (default)
postgres://user:password@localhost:5432/dbname

SSH Tunnel Support

DBHub supports connecting to databases through SSH tunnels, enabling secure access to databases in private networks or behind firewalls.

Using SSH Config File (Recommended)

DBHub can read SSH connection settings from your ~/.ssh/config file. Simply use the host alias from your SSH config:

npx @bytebase/dbhub \
- -dsn "postgres://dbuser:[email protected]:5432/mydb" \
- -ssh-host mybastion

DBHub will automatically use the settings from your SSH config, including hostname, user, port, and identity file. If no identity file is specified in the config, DBHub will try common default locations (~/.ssh/id_rsa, ~/.ssh/id_ed25519, etc.).

SSH with Password Authentication

npx @bytebase/dbhub \
- -dsn "postgres://dbuser:[email protected]:5432/mydb" \
- -ssh-host bastion.example.com \
- -ssh-user ubuntu \
- -ssh-password mypassword

SSH with Private Key Authentication

npx @bytebase/dbhub \
- -dsn "postgres://dbuser:[email protected]:5432/mydb" \
- -ssh-host bastion.example.com \
- -ssh-user ubuntu \
- -ssh-key ~/.ssh/id_rsa

SSH with Private Key and Passphrase

npx @bytebase/dbhub \
- -dsn "postgres://dbuser:[email protected]:5432/mydb" \
- -ssh-host bastion.example.com \
- -ssh-port 2222 \
- -ssh-user ubuntu \
- -ssh-key ~/.ssh/id_rsa \
- -ssh-passphrase mykeypassphrase

Using Environment Variables

export SSH_HOST=bastion.example.com
export SSH_USER=ubuntu
export SSH_KEY=~/.ssh/id_rsa
npx @bytebase/dbhub --dsn "postgres://dbuser:[email protected]:5432/mydb"

Note: When using SSH tunnels, the database host in your DSN should be the hostname/IP as seen from the SSH server (bastion host), not from your local machine.

Configure your database connection

You can use DBHub in demo mode with a sample employee database for testing:

npx @bytebase/dbhub  --demo

[!WARNING] If your user/password contains special characters, you need to escape them first. (e.g. pass#word should be escaped as pass%23word)

For real databases, a Database Source Name (DSN) is required. You can provide this in several ways:

• Command line argument (highest priority):

  npx @bytebase/dbhub  --dsn "postgres://user:password@localhost:5432/dbname?sslmode=disable"
  

• Environment variable (second priority):

  export DSN="postgres://user:password@localhost:5432/dbname?sslmode=disable"
  npx @bytebase/dbhub
  

• Environment file (third priority):

• For development: Create .env.local with your DSN

• For production: Create .env with your DSN

  DSN=postgres://user:password@localhost:5432/dbname?sslmode=disable
  

[!WARNING] When running in Docker, use host.docker.internal instead of localhost to connect to databases running on your host machine. For example: mysql://user:[email protected]:3306/dbname

DBHub supports the following database connection string formats:

SQL Server

Extra query parameters:

authentication

• authentication=azure-active-directory-access-token. Only applicable when running from Azure. See DefaultAzureCredential.

Transport

• stdio (default) - for direct integration with tools like Claude Desktop:

  npx @bytebase/dbhub --transport stdio --dsn "postgres://user:password@localhost:5432/dbname?sslmode=disable"
  

• http - for browser and network clients:

  npx @bytebase/dbhub --transport http --port 5678 --dsn "postgres://user:password@localhost:5432/dbname?sslmode=disable"
  

Command line options

The demo mode uses an in-memory SQLite database loaded with the sample employee database that includes tables for employees, departments, titles, salaries, department employees, and department managers. The sample database includes SQL scripts for table creation, data loading, and testing.

Development

1. Install dependencies:

   pnpm install
   

2. Run in development mode:

   pnpm dev
   

3. Build for production:

   pnpm build
   pnpm start --transport stdio --dsn "postgres://user:password@localhost:5432/dbname?sslmode=disable"
   

Testing

The project uses Vitest for comprehensive unit and integration testing:

• Run all tests: pnpm test
• Run tests in watch mode: pnpm test:watch
• Run integration tests: pnpm test:integration

Integration Tests

DBHub includes comprehensive integration tests for all supported database connectors using Testcontainers. These tests run against real database instances in Docker containers, ensuring full compatibility and feature coverage.

Prerequisites

• Docker: Ensure Docker is installed and running on your machine
• Docker Resources: Allocate sufficient memory (recommended: 4GB+) for multiple database containers
• Network Access: Ability to pull Docker images from registries

Running Integration Tests

Note: This command runs all integration tests in parallel, which may take 5-15 minutes depending on your system resources and network speed.

pnpm test:integration

pnpm test src/connectors/__tests__/postgres.integration.test.ts\n\n# Run only MySQL integration tests
pnpm test src/connectors/__tests__/mysql.integration.test.ts\n\n# Run only MariaDB integration tests
pnpm test src/connectors/__tests__/mariadb.integration.test.ts\n\n# Run only SQL Server integration tests
pnpm test src/connectors/__tests__/sqlserver.integration.test.ts\n\n# Run only SQLite integration tests
pnpm test src/connectors/__tests__/sqlite.integration.test.ts\n\n# Run JSON RPC integration tests
pnpm test src/__tests__/json-rpc-integration.test.ts

All integration tests follow these patterns:

1. Container Lifecycle: Start database container → Connect → Setup test data → Run tests → Cleanup
2. Shared Test Utilities: Common test patterns implemented in IntegrationTestBase class
3. Database-Specific Features: Each database includes tests for unique features and capabilities
4. Error Handling: Comprehensive testing of connection errors, invalid SQL, and edge cases

Troubleshooting Integration Tests

Container Startup Issues:

docker ps

# Check available memory
docker system df

# Pull images manually if needed
docker pull postgres:15-alpine
docker pull mysql:8.0
docker pull mariadb:10.11
docker pull mcr.microsoft.com/mssql/server:2019-latest

SQL Server Timeout Issues:

• SQL Server containers require significant startup time (3-5 minutes)
• Ensure Docker has sufficient memory allocated (4GB+ recommended)
• Consider running SQL Server tests separately if experiencing timeouts

Network/Resource Issues:

pnpm test:integration --reporter=verbose

# Run single database test to isolate issues
pnpm test:integration -- --testNamePattern="PostgreSQL"

# Check Docker container logs if tests fail
docker logs <container_id>

Pre-commit Hooks (for Developers)

The project includes pre-commit hooks to run tests automatically before each commit:

1. After cloning the repository, set up the pre-commit hooks:

   ./scripts/setup-husky.sh
   

2. This ensures the test suite runs automatically whenever you create a commit, preventing commits that would break tests.

Debug with MCP Inspector## stdio

TRANSPORT=stdio DSN="postgres://user:password@localhost:5432/dbname?sslmode=disable" npx @modelcontextprotocol/inspector node /path/to/dbhub/dist/index.js

HTTP

pnpm dev --transport=http --port=8080

# Start the MCP Inspector in another terminal
npx @modelcontextprotocol/inspector

Connect to the DBHub server /message endpoint

Contributors

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