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Listen to change events on your Postgres tables then perform callback-like actions with the data.

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walex lib mix tasks database helpers.ex
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lib/mix/tasks/database/helpers.ex 

defmodule Mix.Tasks.Helpers do

  @moduledoc false

  def create_database(database_name) do

    "-c \"CREATE DATABASE #{database_name};\""

    |> database_cmd()

  end



  def drop_database(database_name) do

    "-c \"DROP DATABASE #{database_name};\""

    |> database_cmd()

  end



  def create_extension(pid, extension) do

    extension_query = "CREATE EXTENSION IF NOT EXISTS \"#{extension}\";"



    Postgrex.query!(pid, extension_query, [])

  end



  def database_cmd(cmd) do

    db_cmd = "psql -U postgres " <> cmd



    case System.shell(db_cmd) do

      {output, 0} ->

        output



      {output, _status} ->

        output

    end

  end

end