ADBC Driver for DuckDB Quack

This repository contains ADBC drivers for DuckDB Quack, implemented in C++.

This project is not associated with DuckDB Labs.

Installation

Pre-packaged builds of the drivers in this repo have been made available for various platforms from the Columnar CDN. These can be installed by any tool that supports ADBC Driver Manifests, such as dbc:

dbc install quack --pre

See Building if you would rather build the drivers yourself.

Connecting

Set the ADBC database option uri to quack://HOST[:PORT]/?token=TOKEN. Connections require TLS and verify the server certificate by default, including connections to localhost.

The database option quack.tls or the URI query parameter tls selects the transport:

Value	Behavior
true (default)	Require TLS and verify the server certificate and hostname.
false	Use plaintext HTTP.
skip_verify or skip-verify	Require TLS without verifying the server certificate or hostname.

For the local development server, start docker compose up -d --wait test-service and use quack://localhost:9496/?token=quack-secret&tls=skip_verify. The Compose fixture includes a Caddy TLS proxy with a locally issued certificate. The plaintext endpoint is also available at quack://localhost:9494/?token=quack-secret&tls=false.

An explicit quack.tls database option overrides the URI setting regardless of the order in which options are set. Changes affect subsequently initialized connections; existing connections retain their transport settings. Empty, null, unknown, and duplicate URI tls values are rejected.

Building

See CONTRIBUTING.md.

Contributing

See CONTRIBUTING.md.