Db Universal

A database-agnostic MCP (Model Context Protocol) server that lets you chat with your database through Claude or GitHub Copilot. Ask questions in plain English and the AI will write and execute the SQL for you.

Supported Databases

Database	Driver	Install
PostgreSQL	pg	npm install pg
MySQL	mysql2	npm install mysql2
SQL Server	mssql	npm install mssql
SQLite	better-sqlite3	npm install better-sqlite3
Oracle	oracledb	npm install oracledb

---

Quick Start

0. Prerequisites — Install Node.js

This tool runs on Node.js. If you don't have it installed, do that first:

1. Go to nodejs.org and download the LTS version (recommended for most users)
2. Run the installer and follow the prompts
3. Once installed, open a terminal (Command Prompt / PowerShell on Windows, Terminal on macOS/Linux) and verify it worked:

node --version   # should print something like v20.x.x
npm --version    # should print something like 10.x.x

If both commands return version numbers, you're good to go

1. Install globally

npm install -g fm-db-mcp-universal

# Then install your DB driver:
npm install -g pg           # PostgreSQL
npm install -g mysql2       # MySQL
npm install -g mssql tedious # SQL Server
npm install -g better-sqlite3  # SQLite
npm install -g oracledb     # Oracle

2. Connect to Claude Desktop

Edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or C:\Users\<username>\AppData\Roaming\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "my-db": {
      "command": "npx",
      "args": ["fm-db-mcp-universal"],
      "env": {
        "DB_CLIENT":   "oracle",
        "DB_HOST":     "localhost",
        "DB_PORT":     "1521",
        "DB_NAME":     "orcl",
        "DB_USER":     "xxx",
        "DB_PASSWORD": "xxx"
      }
    }
  }
}

3. Connect to VS Code (GitHub Copilot Agent mode)

Create .vscode/mcp.json in your workspace:

{
  "servers": {
    "oracle-db": {
      "command": "npx",
      "args": [
        "fm-db-mcp-universal"
      ],
      "env": {
        "DB_CLIENT": "oracle",
        "DB_HOST": "localhost",
        "DB_PORT": "1521",
        "DB_NAME": "orcl",
        "DB_USER": "FMCPROD1",
        "DB_PASSWORD": "FMCPROD1"
      }
    },
    "postgres-db": {
      "command": "npx",
      "args": [
        "fm-db-mcp-universal"
      ],
      "env": {
        "DB_CLIENT": "postgres",
        "DB_HOST": "localhost",
        "DB_PORT": "5432",
        "DB_USER": "postgres",
        "DB_PASSWORD": "password",
        "DB_NAME": "postgres"
      }
    },
    "mssql-db": {
      "command": "npx",
      "args": [
        "fm-db-mcp-universal"
      ],
      "env": {
        "DB_CLIENT": "mssql",
        "DB_HOST": "localhost",
        "DB_PORT": "1433",
        "DB_USER": "sa",
        "DB_PASSWORD": "sadmin",
        "DB_NAME": "ALLMERGE"
      }
    },
  }
}

---

Configuration

All configuration is via environment variables:

Variable	Description	Default
DB_CLIENT	Database type: postgres, mysql, mssql, sqlite, oracle	postgres
DB_HOST	Database host	localhost
DB_PORT	Database port (auto-detected if not set)	per DB
DB_USER	Username	—
DB_PASSWORD	Password	—
DB_NAME	Database name	—
DB_FILENAME	File path (SQLite only)	—
DB_CONNECTION_STRING	Full connection string (overrides above)	—
DB_READONLY	Set true to disable writes/DDL	false
DB_POOL_MIN	Connection pool minimum	1
DB_POOL_MAX	Connection pool maximum	5

Using a Connection String

{
  "env": {
    "DB_CLIENT": "postgres",
    "DB_CONNECTION_STRING": "postgresql://user:pass@localhost:5432/mydb"
  }
}

---

Database-Specific Examples

PostgreSQL

{
  "DB_CLIENT": "postgres",
  "DB_HOST": "localhost",
  "DB_USER": "postgres",
  "DB_PASSWORD": "secret",
  "DB_NAME": "myapp"
}

MySQL / MariaDB

{
  "DB_CLIENT": "mysql",
  "DB_HOST": "localhost",
  "DB_USER": "root",
  "DB_PASSWORD": "secret",
  "DB_NAME": "myapp"
}

SQL Server (MSSQL)

{
  "DB_CLIENT": "mssql",
  "DB_HOST": "localhost",
  "DB_PORT": "1433",
  "DB_USER": "sa",
  "DB_PASSWORD": "YourPassword123!",
  "DB_NAME": "Northwind"
}

SQLite

{
  "DB_CLIENT": "sqlite",
  "DB_FILENAME": "/path/to/database.db"
}

Oracle

{
  "DB_CLIENT": "oracle",
  "DB_HOST": "localhost",
  "DB_PORT": "1521",
  "DB_USER": "myuser",
  "DB_PASSWORD": "mypassword",
  "DB_NAME": "ORCL"
}

---

Available MCP Tools

Tool	Description
db_ping	Test connection and confirm it's working
db_query	Run a SELECT query (read-only, auto-limited to 100 rows)
db_execute	Run INSERT/UPDATE/DELETE/DDL (disabled in read-only mode)
db_list_tables	List all tables and views
db_describe_table	Get columns, types, nullability for a table
db_table_indexes	Get index information for a table
db_foreign_keys	Get foreign key relationships for a table
db_schema_snapshot	Full schema dump of all tables at once

---

Example Chat Interactions

Once connected, just talk naturally:

"What tables do I have?" → Calls db_list_tables

"Show me all users who signed up in the last 30 days" → Writes and executes a SELECT with date filter

"How many orders are in 'pending' status?" → COUNT query

"What's the schema of the orders table?" → Calls db_describe_table

"Add an index on users.email" → Calls db_execute with CREATE INDEX statement

"Give me a summary of sales by region this year" → GROUP BY query with aggregation

---

Read-Only Mode

To protect production databases, enable read-only mode:

{
  "env": {
    "DB_READONLY": "true",
    ...
  }
}

In read-only mode, db_execute is disabled — only SELECT queries are allowed.

---

Running from Source

git clone https://github.com/yourname/mcp-db-universal
cd mcp-db-universal
npm install
npm install better-sqlite3  # or your DB driver
npm run build

Then configure Claude/Copilot to use:

{
  "command": "node",
  "args": ["/path/to/mcp-db-universal/dist/index.js"],
  "env": { ... }
}

Or run directly in dev mode:

DB_CLIENT=sqlite DB_FILENAME=./test.db npm run dev

---

Publishing to npm

npm run build
npm publish

Users can then use npx:

{
  "command": "npx",
  "args": ["mcp-db-universal"],
  "env": { ... }
}

---

License

MIT