# MssqlEcto
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[Ecto](https://github.com/elixir-ecto/ecto) Adapter for [Mssqlex](https://github.com/findmypast-oss/mssqlex)
## Installation
### Erlang ODBC Application
MssqlEcto requires the [Erlang ODBC application](http://erlang.org/doc/man/odbc.html) to be installed. This might require the installation of an additional package depending on how you have installed Elixir/Erlang (e.g. on Ubuntu `sudo apt-get install erlang-odbc`).
### Microsoft's ODBC Driver
MssqlEcto depends on Microsoft's ODBC Driver for SQL Server. You can find installation instructions for [Linux](https://docs.microsoft.com/en-us/sql/connect/odbc/linux/installing-the-microsoft-odbc-driver-for-sql-server-on-linux) or [other platforms](https://docs.microsoft.com/en-us/sql/connect/odbc/microsoft-odbc-driver-for-sql-server) on the official site.
### Hex
#### With [Application Inference](https://elixir-lang.org/blog/2017/01/05/elixir-v1-4-0-released/#application-inference)
If you are using [application inference](https://elixir-lang.org/blog/2017/01/05/elixir-v1-4-0-released/#application-inference), i.e. `application` in your `mix.exs` looks something like this:
```elixir
def application do
[extra_applications: [:logger]]
end
```
Note, the lack of `:applications` key. Then, you just need to add the following dependencies:
```elixir
def deps do
[{:mssql_ecto, "~> 1.2.0"},
{:mssqlex, "~> 1.1.0"}]
end
```
#### Without [Application Inference](https://elixir-lang.org/blog/2017/01/05/elixir-v1-4-0-released/#application-inference)
If you are explicitly calling out all running applications under `application` in your `mix.exs`, i.e. it looks something like this:
```elixir
def application do
[applications: [:logger, :plug, :postgrex]]
end
```
Then, you need to add `mssql_ecto` and `mssqlex` to both your `deps` and list of running applications:
```elixir
def application do
[applications: [:logger, :plug, :mssqlex, :mssql_ecto]]
end
def deps do
[{:mssql_ecto, "~> 1.2.0"},
{:mssqlex, "~> 1.1.0"}]
end
```
## Configuration
Example configuration:
```elixir
config :my_app, MyApp.Repo,
adapter: MssqlEcto,
database: "sql_server_db",
username: "bob",
password: "mySecurePa$$word",
hostname: "localhost",
instance_name: "MSSQLSERVER",
port: "1433"
```
## Example Project
An example project using mssql_ecto with Docker has kindly been created by [Chase Pursłey](https://github.com/cpursley). It can be viewed [here](https://github.com/cpursley/mssql_ecto_friends).
## Type Mappings
| Ecto Type | SQL Server Type | Caveats |
| :-------------: | :------------------: | :--------------------------------------------------------------------------------------------------------------------------------------------------: |
| :id | int | |
| :serial | int identity(1, 1) | |
| :bigserial | bigint identity(1,1) | When a query is returning this value with the `returning` syntax and no schema is used, it will be returned as a string rather than an integer value |
| :binary_id | char(36) | |
| :uuid | char(36) | |
| :string | nvarchar | |
| :binary | nvarchar(4000) | Limited size, not fully implemented |
| :integer | int | |
| :boolean | bit | |
| {:array, type} | list of type | Not Supported |
| :map | nvarchar(4000) | Not Supported |
| {:map, \_} | nvarchar(4000) | Not Supported |
| :date | date | |
| :time | time | Can write but can't read |
| :utc_datetime | datetime2 | |
| :naive_datetime | datetime2 | |
| :float | float | |
| :decimal | decimal | |
## Features not yet implemented
* Table comments
* Column comments
* On conflict
* Upserts
## Contributing
### Code of Conduct
This project had a [Code of Conduct](https://github.com/findmypast-oss/mssql_ecto/blob/master/CODE_OF_CONDUCT.md) if you wish to contribute to this project, please abide by its rules.
