adbc-driver-postgresql

ADBC PostgreSQL Driver for Python

This package contains bindings for the PostgreSQL driver, using the driver manager to provide a DBAPI 2.0/PEP 249-compatible interface on top.

Example

import adbc_driver_postgresql.dbapi

uri = "postgresql://postgres:password@localhost:5432/postgres"
with adbc_driver_postgresql.dbapi.connect(uri) as conn:
    with conn.cursor() as cur:
        cur.execute("SELECT 1")
        print(cur.fetch_arrow_table())

Building

Dependencies: a build of the PostgreSQL driver, and the adbc-driver-manager Python package. Optionally, install PyArrow to use the DBAPI 2.0-compatible interface.

Set the environment variable ADBC_POSTGRESQL_LIBRARY to the path to libadbc_driver_postgresql.{dll,dylib,so} before running pip install.

# If not already installed
pip install -e ../adbc_driver_manager

export ADBC_POSTGRESQL_LIBRARY=/path/to/libadbc_driver_postgresql.so
pip install --no-deps -e .

For users building from the arrow-adbc source repository, you can alternately use CMake to manage library dependencies and set environment variables for you. Assuming you specify -DADBC_DRIVER_POSTGRESQL=ON you can also add -DADBC_BUILD_PYTHON=ON to define a python target.

For example, assuming you run cmake from the project root:

cmake -S c -B build --preset debug -DADBC_BUILD_PYTHON=ON -DADBC_DRIVER_POSTSGRESQL=ON
cmake --build build --target python

will properly build and install the Python library for you.

See CONTRIBUTING.md for details on the general build process.

Testing

A running instance of PostgreSQL is required. For example, using Docker:

$ docker run -it --rm \
    -e POSTGRES_PASSWORD=password \
    -e POSTGRES_DB=tempdb \
    -p 5432:5432 \
    postgres

Then, to run the tests, set the environment variable specifying the PostgreSQL URI before running tests:

$ export ADBC_POSTGRESQL_TEST_URI=postgresql://localhost:5432/postgres?user=postgres&password=password
$ pytest -vvx

See CONTRIBUTING.md for details on the general test process.