Adbc

Elixir bindings for Arrow Database Connectivity (ADBC).

Adbc provides a standard database interface using the Apache Arrow format. See Adbc documentation for setting it up and the available drivers.

Quick run-through

First, add :adbc as a dependency in your mix.exs:

{:adbc, "~> 0.1"}

Now, in your config/config.exs, configure the drivers you are going to use. Let's use sqlite3 as an example (see Adbc for all supported drivers):

config :adbc, :drivers, [:sqlite]

If you are using a notebook or scripting, you can also use Adbc.download_driver!/1 to dynamically download one.

Then start the database and the relevant connection processes in your supervision tree:

children = [
  {Adbc.Database,
   driver: :sqlite,
   process_options: [name: MyApp.DB]},
  {Adbc.Connection,
   database: MyApp.DB,
   process_options: [name: MyApp.Conn]}
]

Supervisor.start_link(children, strategy: :one_for_one)

In a notebook, the above would look like this:

{:ok, db} = Kino.start_child({Adbc.Database, driver: :sqlite})
{:ok, conn} = Kino.start_child({Adbc.Connection, database: db})

And now you can make queries with:

# For named connections
{:ok, _} = Adbc.Connection.query(MyApp.Conn, "SELECT 123")

# When using the conn PID directly
{:ok, _} = Adbc.Connection.query(conn, "SELECT 123")

Updating ADBC

This library vendors ADBC C implementation inside the 3rd_party folder. In order to update it:

1. Download source for latest ADBC release
2. Copy root files and c/ directory from ADBC into 3rd_party/apache-arrow-adbc
3. Update the driver version in lib/adbc_driver.ex

License

Copyright 2023 Cocoa Xu, José Valim

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.