Tds.Ecto

MSSQL / TDS Adapter for Ecto

Example

# In your config/config.exs file add MSSQL connection options
# By default it use port 1433, different port can be specified with
# port: 1434
# option and named instance with
# instance: "instance_name"
config :my_app, Repo,
  database: "ecto_simple",
  username: "mssql",
  password: "mssql",
  hostname: "localhost"

# In your application code
defmodule Repo do
  use Ecto.Repo,
    otp_app: :my_app,
    adapter: Tds.Ecto
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

Usage

Add Tds as a dependency in your mix.exs file.

def deps do
  [{:tds_ecto, "~> 0.2"}]
end

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

def application do
  [applications: [:logger, :tds_ecto, :ecto]]
end

To use the adapter in your repo:

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

tds_ecto relies on pattern matching against error messages to extract constraint names. If your SQL server is not configured to English as its default language you may add an after_connect hook to your repo and set English as the language for Ecto connections.

def after_connect(conn) do
  Tds.Ecto.Connection.query(conn, "SET LANGUAGE English", [], [])
end

For additional information on usage please see the documentation for Ecto.

Data Type Mapping

MSSQL             	Ecto
----------        	------
nvarchar          	:string
varchar			  	:binary
char              	:binary
varbinary		  	:binary
float             	:float
decimal           	:decimal
integer 		  	:integer
bit 			  	:boolean
uniqueidentifier  	:uuid
datetime		  	:datetime
date			  	:date
time 			  	:time

Contributing

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

$ git clone https://github.com/livehelpnow/tds_ecto.git
$ cd tds_ecto
$ mix test

The tests require an addition to your hosts file to connect to your sql server database.

mssql.local

Additionally SQL authentication needs to be used for connecting and testing. Add the user test_user with access to the database test_db. See one of the test files for the connection information and port number.

License

Copyright 2014, 2015 LiveHelpNow

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.