An Ecto SQLite3 Adapter.

• Prepared statements are not cached.
• Prepared statements are not immutable. You must be careful when manipulating statements and binding values to statements. Do not try to manipulate the statements concurrently. Keep it isolated to one process.
• Adding a CHECK constraint is not supported by the Ecto adapter. This is due to how Ecto handles specifying constraints. In SQLite you must specify the CHECK on creation.
• All native calls are run through the Dirty NIF scheduler.
• Datetimes are stored without offsets. This is due to how SQLite3 handles date and times. If you would like to store a timezone, you will need to create a second column somewhere storing the timezone name and shifting it when you get it from the database. This is more reliable than storing the offset as +03:00 as it does not respect daylight savings time.

defp deps do
  {:ecto_sqlite3, "~> 0.5.0"}
end

Define your repo similar to this.

defmodule MyApp.Repo do
  use Ecto.Repo, otp_app: :my_app, adapter: Ecto.Adapters.SQLite3
end

Configure your repository similar to the following. If you want to know more about the possible options to pass the repository, checkout the documentation for SQLite3.Connection.connect/1. It will have more information on what is configurable.

config :my_app,
  ecto_repos: [MyApp.Repo]

config :my_app, MyApp.Repo,
  database: "path/to/my/database.db",
  show_sensitive_data_on_connection_error: false,
  journal_mode: :wal,
  cache_size: -64000,
  temp_store: :memory,
  pool_size: 1

• Pool size is set to 1 but can be increased to 4. When set to 10 there was a lot of database busy errors. Currently this is a known issue and is being looked in to.

• Cache size is a negative number because that is how SQLite3 defines the cache size in kilobytes. If you make it positive, that is the number of pages in memory to use. Both have their pros and cons. Check the documentation out for SQLite3.

• Uses Exqlite as the driver to communicate with sqlite3.

Feel free to check the project out and submit pull requests.