MySQL 5.7+ driver for Elixir
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Latest commit 3cf9efc Jan 15, 2019


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MySQL driver for Elixir.



  • 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


Add :myxql to your dependencies:

def deps() do
    {:myxql, "~> 0.1"}
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")
   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)
iex> MyXQL.query!(:myxql, "SELECT NOW()").rows
[[~N[2018-12-28 13:42:31]]]

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       ~N[2013-10-12 00:37:14] **
json            %{"foo" => "bar"}

* See Decimal

** datetime/timestamp fields are always decoded 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


Run tests:

git clone
cd myxql
mix deps.get
mix test

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


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

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.