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All contributions to databases are welcome!


To make it as simple as possible for us to help you, please include the following:

  • OS
  • python version
  • databases version
  • database backend (mysql, sqlite or postgresql)
  • database driver (aiopg, aiomysql etc.)

Please try to always include the above unless you're unable to install databases or know it's not relevant to your question or feature request.

Pull Requests

It should be quite straight forward to get started and create a Pull Request.


Unless your change is trivial (typo, docs tweak etc.), please create an issue to discuss the change before creating a pull request.

To make contributing as easy and fast as possible, you'll want to run tests and linting locally.

You'll need to have python >= 3.6 (recommended 3.7+) and git installed.

Getting started

  1. Clone your fork and cd into the repo directory

    git clone<your username>/databases.git
    cd databases

  2. Create and activate virtual env

    virtualenv env
    source env/bin/activate

  3. Install databases, dependencies and test dependencies

    pip install -r requirements.txt

  4. Checkout a new branch and make your changes

    git checkout -b my-new-feature-branch

Make your changes...


  1. Formatting and linting - databases uses black for formatting, autoflake for linting and mypy for type hints check run all of those with lint script


  2. Prepare tests (basic)

  3. Set-up TEST_DATABASE_URLS env variable where you can comma separate urls for several backends
  4. The simples one is for sqlite alone: sqlite:///test.db

  5. Prepare tests (all backends)

  6. In order to run all backends you need either a docker installation on your system or all supported backends servers installed on your local machine.
  7. A sample docker configuration that reflects the CI/CD workflow of databases might be:

 version: '2.1'
     image: postgres:10.8
       POSTGRES_USER: username
       POSTGRES_PASSWORD: password
       POSTGRES_DB: testsuite
       - 5432:5432

     image: mysql:5.7
       MYSQL_USER: username
       MYSQL_PASSWORD: password
       MYSQL_ROOT_PASSWORD: password
       MYSQL_DATABASE: testsuite
       - 3306:3306
3. To test all backends, the test urls need to consist of all possible drivers too, so a sample might look like following:

  1. Run tests


  2. Build documentation

  3. If you have changed the documentation make sure it runs successfully. You can preview the live documentation by running the following command:


  4. Commit, push, and create your pull request