adbc-driver-postgresql 1.10.0
A libpq-based ADBC driver for working with PostgreSQL.
Requires Python: >=3.10

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# ADBC PostgreSQL Driver for Python

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

[dbapi]: https://peps.python.org/pep-0249/
[driver-manager]: https://arrow.apache.org/adbc/current/python/driver_manager.html
[postgresql]: https://arrow.apache.org/adbc/current/driver/postgresql.html

## Example

```python
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:

```shell
cmake -S c -B build --preset debug -DADBC_BUILD_PYTHON=ON -DADBC_DRIVER_POSTGRESQL=ON
cmake --build build --target python
```

will properly build and install the Python library for you.

See [CONTRIBUTING.md](../../CONTRIBUTING.md) for details on the
general build process.

## Testing

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

```shell
$ 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:

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

See [CONTRIBUTING.md](../../CONTRIBUTING.md) for details on the
general test process.