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https://github.com/elixir-ecto/myxql

MySQL 5.5+ driver for Elixir
https://github.com/elixir-ecto/myxql

database elixir mysql

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MySQL 5.5+ driver for Elixir

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# MyXQL



[![CI](https://github.com/elixir-ecto/myxql/workflows/CI/badge.svg)](https://github.com/elixir-ecto/myxql/actions?query=workflow%3ACI)



MySQL driver for Elixir.



Documentation: 



## Features



  * Automatic decoding and encoding of Elixir values to and from MySQL text and binary protocols

  * Supports transactions, prepared queries, streaming, pooling and more via [DBConnection](https://github.com/elixir-ecto/db_connection)

  * Supports MySQL 5.5+, 8.0, and MariaDB 10.3

  * Supports `mysql_native_password`, `sha256_password`, and `caching_sha2_password`

    authentication plugins



## Usage



Add `:myxql` to your dependencies:



```elixir

def deps do

  [

    {:myxql, "~> 0.7.0"}

  ]

end

```



Make sure you are using the latest version!



```elixir

iex> {:ok, pid} = MyXQL.start_link(username: "root")

iex> MyXQL.query!(pid, "CREATE DATABASE IF NOT EXISTS blog")



iex> {:ok, pid} = MyXQL.start_link(username: "root", database: "blog")

iex> MyXQL.query!(pid, "CREATE TABLE posts IF NOT EXISTS (id serial primary key, title text)")



iex> MyXQL.query!(pid, "INSERT INTO posts (`title`) VALUES ('Post 1')")

%MyXQL.Result{columns: nil, connection_id: 11204,, last_insert_id: 1, num_rows: 1, num_warnings: 0, rows: nil}



iex> MyXQL.query(pid, "INSERT INTO posts (`title`) VALUES (?), (?)", ["Post 2", "Post 3"])

%MyXQL.Result{columns: nil, connection_id: 11204, last_insert_id: 2, num_rows: 2, num_warnings: 0, rows: nil}



iex> MyXQL.query(pid, "SELECT * FROM posts")

{:ok,

 %MyXQL.Result{

   columns: ["id", "title"],

   connection_id: 11204,

   last_insert_id: nil,

   num_rows: 3,

   num_warnings: 0,

   rows: [[1, "Post 1"], [2, "Post 2"], [3, "Post 3"]]

 }}

```



It's recommended to start MyXQL under supervision tree:



```elixir

defmodule MyApp.Application do

  use Application



  def start(_type, _args) do

    children = [

      {MyXQL, username: "root", name: :myxql}

    ]



    Supervisor.start_link(children, opts)

  end

end

```



and then we can refer to it by its `:name`:



```elixir

iex> MyXQL.query!(:myxql, "SELECT NOW()").rows

[[~N[2018-12-28 13:42:31]]]

```



## Mariaex Compatibility



See [Mariaex Compatibility](https://github.com/elixir-ecto/myxql/blob/master/MARIAEX_COMPATIBILITY.md) page for transition between drivers.



## Data representation



| MySQL                   | Elixir                                          |

|-------------------------|-------------------------------------------------|

| `NULL`                  | `nil`                                           |

| `bool`                  | `0`, `1`                                        |

| `int`                   | `42`                                            |

| `float`                 | `42.0`                                          |

| `decimal`               | `#Decimal<42.0>` (1)                            |

| `date`                  | `~D[2013-10-12]` (2)                            |

| `time`                  | `~T[00:37:14]` (3)                              |

| `datetime`              | `~N[2013-10-12 00:37:14]` (2), (4)              |

| `timestamp`             | `~U[2013-10-12 00:37:14Z]` (2), (4), (7)        |

| `json`                  | `%{"foo" => "bar"}` (5)                         |

| `char`                  | `"é"`                                           |

| `text`                  | `"myxql"`                                       |

| `binary`                | `<<1, 2, 3>>`                                   |

| `bit`                   | `<<1::size(1), 0::size(1)>>`                    |

| `point`, `polygon`, ... | `%Geo.Point{coordinates: {0.0, 1.0}}, ...` (6)  |



Notes:



1. See [Decimal](https://github.com/ericmj/decimal)



2. When using SQL mode that allows them, MySQL "zero" dates and datetimes are represented as `:zero_date` and `:zero_datetime` respectively.



3. Values that are negative or greater than `24:00:00` cannot be decoded



4. Datetime fields are represented as `NaiveDateTime`, however a UTC `DateTime` can be used for encoding as well



5. MySQL added a native JSON type in version 5.7.8, if you're using earlier versions,

remember to use TEXT column for your JSON field.



6. See "Geometry support" section below



7. See "UTC required" section below



## JSON support



MyXQL comes with JSON support via the [Jason](https://github.com/michalmuskala/jason) library.



To use it, add `:jason` to your dependencies:



```elixir

{:jason, "~> 1.0"}

```



You can customize it to use another library via the `:json_library` configuration:



```elixir

config :myxql, :json_library, SomeJSONModule

```



## Geometry support



MyXQL comes with Geometry types support via the [Geo](https://github.com/bryanjos/geo) package.



To use it, add `:geo` to your dependencies:



```elixir

{:geo, "~> 3.3"}

```



Note, some structs like `%Geo.PointZ{}` does not have equivalent on the MySQL server side and thus

shouldn't be used.



If you're using MyXQL geometry types with Ecto and need to for example accept a WKT format as user

input, consider implementing an [custom Ecto type](https://hexdocs.pm/ecto/Ecto.Type.html).



## UTC required



When using `DateTime` type, MyXQL assumes the server is configured with the UTC time

zone. If that is not the case, set it manually with `MyXQL.start_link/1` and

`:after_connect` option:



```elixir

MyXQL.start_link(after_connect: &MyXQL.query!(&1, "SET time_zone = '+00:00'"))

```



or when configuring `Ecto.Repo`:



```elixir

config :myapp, MyApp.Repo,

  after_connect: {MyXQL, :query!, ["SET time_zone = '+00:00'", []]}

```



## Contributing



Run tests:



```text

git clone [email protected]:elixir-ecto/myxql.git

cd myxql

mix deps.get

mix test

```



See [`scripts/test-versions.sh`](scripts/test-versions.sh) for scripts used to test against different server versions.



## License



The source code is under Apache License 2.0.



Copyright (c) 2018 Plataformatec \

Copyright (c) 2020 Dashbit



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](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.