0.1.3

adbcBridge (Python)

Thin Python wrapper around adbcBridge, the ADBC driver for any ODBC data source. It finds the libadbc_driver_odbc shared library and hands it to adbc_driver_manager, so every ODBC driver on the machine becomes an Arrow-native ADBC database.

pip install adbcbridge

import adbcbridge

with adbcbridge.connect(uri="Driver=SQLite3;Database=my.db;") as conn:
    with conn.cursor() as cur:
        cur.execute("SELECT * FROM t")
        table = cur.fetch_arrow_table()   # pyarrow.Table

connect() returns a plain adbc_driver_manager.dbapi.Connection, so the whole ADBC DBAPI surface (cursor(), fetch_arrow_table(), adbc_ingest(), adbc_get_objects(), …) is available.

API

adbcbridge.connect(uri=None, dsn=None, username=None, password=None,
                   driver_path=None, *, autocommit=False, conn_kwargs=None,
                   **options) -> adbc_driver_manager.dbapi.Connection
adbcbridge.driver_path() -> str            # path of libadbc_driver_odbc.so
adbcbridge.odbc_drivers() -> list[OdbcDriver]   # from odbcinst.ini
adbcbridge.odbcinst_ini() -> pathlib.Path | None
adbcbridge.odbc_driver_library(driver=None, *, uri=None, dsn=None) -> str | None
adbcbridge.preload_odbc_driver(driver=None, *, uri=None, dsn=None,
                               strict=False) -> str | None

import adbcbridge does not import pyarrow: adbc_driver_manager.dbapi is imported inside connect(), after the ODBC driver named in the connection string has been opened. A few ODBC drivers — MySQL Connector/ODBC is the one in the wild — can only be loaded while libstdc++ has not yet been pinned to dynamic thread-local storage, which importing pyarrow does. preload_odbc_driver() is that step on its own, for programs that drive adbc_driver_manager or pyodbc themselves; ADBCBRIDGE_PRELOAD=0 disables the automatic one in connect(). See docs/TROUBLESHOOTING.md.

Extra **options become database options: a bare name is prefixed with adbc.odbc. (batch_size=4096 → adbc.odbc.batch_size), a dotted name is passed through as given, and True/False become "true"/"false".

conn = adbcbridge.connect(
    uri="Driver=/usr/lib/x86_64-linux-gnu/odbc/psqlodbcw.so;Server=127.0.0.1;Database=app;",
    username="app", password="secret",
    batch_size=4096, decimal_as_string=True,   # adbc.odbc.*
)

Finding the driver library

driver_path() looks, in order, at

1. the ADBC_ODBC_DRIVER environment variable (an explicit value that does not exist is an error, not a silent fallback);
2. a copy bundled inside this package (see below);
3. the ADBC driver manifest named odbc — odbc.toml under $ADBC_DRIVER_PATH, <sys.prefix>/etc/adbc/drivers, ~/.config/adbc/drivers, /etc/adbc/drivers, … — as installed by cmake --install build --prefix "$VIRTUAL_ENV";
4. common install locations: <sys.prefix>/lib, /usr/local/lib, /usr/lib, /usr/lib/<arch>-linux-gnu, and a build/ tree next to a source checkout (so pip install -e python works right after cmake --build build).

If nothing matches it raises adbcbridge.DriverNotFoundError.

Command line

adbcbridge query "Driver=SQLite3;Database=my.db;" "SELECT * FROM t"
adbcbridge query "Driver=SQLite3;Database=my.db;" "SELECT * FROM t WHERE i > ?" -p 3
adbcbridge query ... --format csv > out.csv     # or --format schema, --limit N
adbcbridge drivers            # ODBC drivers from odbcinst -j / odbcinst.ini
adbcbridge driver-path        # which libadbc_driver_odbc.so would be used

Building a wheel with the driver bundled

The wheel is pure Python unless a driver library is around at build time, in which case setup.py copies it into the package and tags the wheel for the current platform:

cmake -S . -B build -DCMAKE_BUILD_TYPE=Release && cmake --build build
python -m pip install build
python -m build --wheel python          # picks up ./build/libadbc_driver_odbc.so

Point it somewhere else with ADBCBRIDGE_LIBRARY=/path/to/libadbc_driver_odbc.so (or ADBCBRIDGE_BUILD_DIR=/path/to/cmake-build-tree). Without either, and with no build/ tree, the wheel contains no binary and driver_path() falls back to the manifest or a system-wide install at run time.

Tests

pip install -e python
SQLITE_ODBC_DRIVER=/path/to/libsqlite3odbc.so \
ADBC_ODBC_DRIVER=$PWD/build/libadbc_driver_odbc.so \
  pytest python/tests

Apache-2.0.