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MCP server for secure database access (PostgreSQL, MySQL, SQLite)
About
MCP server for secure database access (PostgreSQL, MySQL, SQLite)
Security Report
8.0
Low Risk8.0Low RiskValid MCP server (1 strong, 1 medium validity signals). 1 code issue detected. 2 known CVEs in dependencies (0 critical, 2 high severity) Package registry verified. Imported from the Official MCP Registry. 1 finding(s) downgraded by scanner intelligence.
4 files analyzed · 4 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Database connection URL. Pattern: DATALINK_<NAME>_URL where <NAME> identifies the database. Supports postgresql://, mysql://, or file path for SQLite.Required
Environment variable: DATALINK_ANALYTICS_URL
Set to 'true' for read-only access. Pattern: DATALINK_<NAME>_READONLY
Environment variable: DATALINK_ANALYTICS_READONLY
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-pilat-mcp-datalink": {
"env": {
"DATALINK_ANALYTICS_URL": "your-datalink-analytics-url-here",
"DATALINK_ANALYTICS_READONLY": "your-datalink-analytics-readonly-here"
},
"args": [
"-y",
"@pilat/mcp-datalink"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
@pilat/mcp-datalink
MCP server for PostgreSQL, MySQL, and SQLite. Gives AI assistants secure database access via Model Context Protocol.
npx @pilat/mcp-datalink
Works with Claude Desktop, Claude Code, Cursor, Cline, and any MCP-compatible client.
Installation
Add to your MCP client config file (see config locations below):
{
"mcpServers": {
"datalink": {
"command": "npx",
"args": ["-y", "@pilat/mcp-datalink"],
"env": {
"DATALINK_ANALYTICS_URL": "postgresql://user:password@localhost:5432/analytics",
"DATALINK_ANALYTICS_READONLY": "true",
"DATALINK_INVENTORY_URL": "mysql://user:password@localhost:3306/inventory",
"DATALINK_CACHE_URL": "sqlite:///path/to/cache.db"
}
}
}
}
This creates three database connections: analytics (read-only), inventory, and cache.
| Variable | Description |
|---|---|
DATALINK_{NAME}_URL | Connection URL (creates database named {name}) |
DATALINK_{NAME}_READONLY | Set to true to block writes |
DATALINK_{NAME}_MAX_TIMEOUT | Max query timeout in ms (caps model requests) |
Connection URL formats:
# PostgreSQL
postgresql://user:password@localhost:5432/dbname
postgresql://user:password@localhost:5432/dbname?sslmode=require
# MySQL
mysql://user:password@localhost:3306/dbname
mysql://user:password@localhost:3306/dbname?ssl=true
# SQLite
sqlite:///path/to/database.db
sqlite:///Users/me/data/app.sqlite
sqlite://../relative/path/data.db
Environment Variable Substitution
URLs support ${VAR} syntax to reference other environment variables:
{
"mcpServers": {
"datalink": {
"command": "npx",
"args": ["-y", "@pilat/mcp-datalink"],
"env": {
"DATALINK_MAIN_URL": "${DATABASE_URL}"
}
}
}
}
This allows reusing existing environment variables (like DATABASE_URL from your shell or .env file).
Supported syntax:
| Syntax | Description |
|---|---|
${VAR} | Expands to value of VAR, or keeps ${VAR} if unset |
${VAR:-default} | Expands to value of VAR, or default if unset |
Examples:
# Reference existing DATABASE_URL
DATALINK_MAIN_URL="${DATABASE_URL}"
# Build URL from parts
DATALINK_MAIN_URL="postgresql://${DB_USER}:${DB_PASS}@${DB_HOST}:5432/mydb"
# With default values
DATALINK_MAIN_URL="postgresql://localhost:${DB_PORT:-5432}/mydb"
Config File Locations
| Client | Config file |
|---|---|
| Claude Code | ~/.claude.json (global) or .mcp.json (project) |
| Claude Desktop (macOS) | ~/Library/Application Support/Claude/claude_desktop_config.json |
| Claude Desktop (Windows) | %APPDATA%\Claude\claude_desktop_config.json |
| Cursor | ~/.cursor/mcp.json or Settings → Features → MCP Servers |
| Cline | cline_mcp_settings.json or VS Code settings cline.mcpServers |
Tools
| Tool | Description |
|---|---|
list_databases | List configured database connections |
list_tables | List tables with row counts |
describe_table | Get schema, indexes, foreign keys |
query | Run SELECT queries |
execute | Run INSERT/UPDATE/DELETE |
explain | Show query execution plans |
Security
- Prepared statements only (no SQL injection)
- Single statement per query (no chaining)
- DDL blocked (no DROP, ALTER, TRUNCATE)
- Readonly mode per connection
- Response size limit (100 rows, 64KB default, configurable via
DATALINK_MAX_TOTAL_SIZE) - Query timeout: 30s default, model can request up to 10min,
MAX_TIMEOUTcaps it
License
MIT
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