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A toolkit for data mapping and language integrated query for Elixir
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lib/ecto/adapter/migrations.ex
defmodule Ecto.Adapter.Migrations do
@moduledoc """
Specifies the adapter migrations API.
"""
use Behaviour
@typedoc "All migration commands"
@type command ::
raw :: String.t |
{:create, Ecto.Migration.Table.t, [table_subcommand]} |
{:alter, Ecto.Migration.Table.t, [table_subcommand]} |
{:drop, Ecto.Migration.Table.t} |
{:create, Ecto.Migration.Index.t} |
{:drop, Ecto.Migration.Index.t}
@typedoc "Table subcommands"
@type table_subcommand ::
{:add, field :: atom, type :: Ecto.Type.t | Ecto.Migration.Reference.t, Keyword.t} |
{:modify, field :: atom, type :: Ecto.Type.t | Ecto.Migration.Reference.t, Keyword.t} |
{:remove, field :: atom}
@doc """
Executes migration commands.
It is recommended for adapters to use timeout of infinity in such
commands, as tasks like adding indexes and upgrading tables can
take hours or even days. Also, ddl queries should not be logged
as they are logged automatically by the migrator.
"""
defcallback execute_ddl(Ecto.Repo.t, command) :: :ok | no_return
@doc """
Checks if ddl value, like a table or index, exists.
Note ddl queries should not be logged as they are logged
automatically by the migrator.
"""
defcallback ddl_exists?(Ecto.Repo.t, Ecto.Migration.Table.t | Ecto.Migration.Index.t) :: boolean
end