joshdholtz / ecto

A database wrapper and language integrated query for Elixir

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Ecto

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Ecto is a domain specific language for writing queries and interacting with databases in Elixir. Here is an example:

defmodule Repo do
  use Ecto.Repo, adapter: Ecto.Adapters.Postgres

  def conf do
    # The scheme can be anything, "ecto" is just an example
    parse_url "ecto://postgres:postgres@localhost/ecto_simple"
  end
end

defmodule Weather do
  use Ecto.Model

  schema "weather" do
    field :city     # Defaults to type :string
    field :temp_lo, :integer
    field :temp_hi, :integer
    field :prcp,    :float, default: 0.0
  end
end

defmodule Simple do
  import Ecto.Query

  def sample_query do
    query = from w in Weather,
          where: w.prcp > 0 or is_nil(w.prcp),
         select: w
    Repo.all(query)
  end
end

See the online documentation or run the sample application for more information.

Usage

Add Ecto as a dependency in your mix.exs file. If you are using PostgreSQL, you will also need the library that Ecto's PostgreSQL adapter is using.

defp deps do
  [{:postgrex, ">= 0.0.0"},
   {:ecto, "~> 0.4"}]
end

You should also update your applications list to include both projects:

def application do
  [applications: [:postgrex, :ecto]]
end

After you are done, run mix deps.get in your shell to fetch the dependencies.

Important links

Contributing

Ecto is on the bleeding edge of Elixir so the latest master build is most likely needed, see Elixir's README on how to build from source.

To contribute you need to compile Ecto from source and test it:

$ git clone https://github.com/elixir-lang/ecto.git
$ cd ecto
$ mix test

If you are contributing to the Postgres adapter you need to run the integration tests for the adapter (it is a good idea to run the integration tests even if you are not contributing to the adapter). You need a Postgres user with username postgres and password postgres or with trust authentication. To run the tests the MIX_ENV environment variable needs to be set to pg when running the tests. To run only the integration tests: MIX_ENV=pg mix test or to run all tests: MIX_ENV=all mix test.

License

Copyright 2012 Plataformatec

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.

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A database wrapper and language integrated query for Elixir


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