MyXQL

MySQL driver for Elixir.

Documentation: http://hexdocs.pm/myxql/

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
• Supports MySQL 5.7.10+, 8.0, and MariaDB 10.3

Usage

Add :myxql to your dependencies:

def deps() do
  [
    {:myxql, "~> 0.1.1"}
  ]
end

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')")
{:ok, %MyXQL.Result{columns: nil, last_insert_id: 1, num_rows: 1, rows: nil}}

iex> MyXQL.query(pid, "INSERT INTO posts (`title`) VALUES (?), (?)", ["Post 2", "Post 3"])
{:ok, %MyXQL.Result{columns: [], last_insert_id: 3, num_rows: 2, rows: nil}}

iex> MyXQL.query(pid, "SELECT * FROM posts")
{:ok,
 %MyXQL.Result{
   columns: ["id", "title"],
   last_insert_id: nil,
   num_rows: 3,
   rows: [[1, "Post 1"], [2, "Post 2"], [3, "Post 3"]]
 }}

It's recommended to start MyXQL under supervision tree:

defmodule MyApp.Application do
  use Application

  def start(_type, _args) do
    children = [
      {MyXQL, username: "root", name: :myxql}
    ]

    Supervisor.start_link(children, opts)
  end
end

iex> MyXQL.query!(:myxql, "SELECT NOW()").rows
[[~N[2018-12-28 13:42:31]]]

Mariaex Compatibility

See Mariaex Compatibility page for transition between drivers.

Data representation

MySQL           Elixir
-----           ------
NULL            nil
bool            1 | 0
char            "é"
int             42
float           42.0
text            "myxql"
decimal         #Decimal<42.0> *
date            ~D[2013-10-12]
time            ~T[00:37:14]
datetime        ~N[2013-10-12 00:37:14] **
timestamp       #DateTime<2013-10-12 00:37:14Z>
json            %{"foo" => "bar"}

* See Decimal

** datetime fields are represented as NaiveDateTime, however a UTC DateTime can be used for encoding as well

JSON support

MyXQL comes with JSON support out of the box via the Jason library. To use it, add :jason to your dependencies:

{:jason, "~> 1.0"}

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

config :myxql, :json_library, SomeJSONModule

Contributing

Run tests:

git clone git@github.com:elixir-ecto/myxql.git
cd myxql
mix deps.get
mix test

See ci.sh for a script used to test against different server versions.

License

The source code is under Apache License 2.0.

Copyright (c) 2018 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.