<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/
namespace phpbb\db\migration;
/**
* The migrator is responsible for applying new migrations in the correct order.
*/
class helper
{
/**
* Get the schema steps from an array of schema changes
*
* This splits up $schema_changes into individual changes so that the
* changes can be chunked
*
* @param array $schema_changes from migration
* @return array
*/
public function get_schema_steps($schema_changes)
{
$steps = array();
// Nested level of data (only supports 1/2 currently)
$nested_level = array(
'drop_tables' => 1,
'add_tables' => 1,
'change_columns' => 2,
'add_columns' => 2,
'drop_keys' => 2,
'drop_columns' => 2,
'add_primary_keys' => 2, // perform_schema_changes only uses one level, but second is in the function
'add_unique_index' => 2,
'add_index' => 2,
);
foreach ($nested_level as $change_type => $data_depth)
{
if (!empty($schema_changes[$change_type]))
{
foreach ($schema_changes[$change_type] as $key => $value)
{
if ($data_depth === 1)
{
$steps[] = array(
'dbtools.perform_schema_changes', array(array(
$change_type => array(
(!is_int($key)) ? $key : 0 => $value,
),
)),
);
}
else if ($data_depth === 2)
{
foreach ($value as $key2 => $value2)
{
$steps[] = array(
'dbtools.perform_schema_changes', array(array(
$change_type => array(
$key => array(
$key2 => $value2,
),
),
)),
);
}
}
}
}
}
return $steps;
}
/**
* Reverse the update steps from an array of data changes
*
* 'If' statements and custom methods will be skipped, for all
* other calls the reverse method of the tool class will be called
*
* @param array $steps Update changes from migration
*
* @return array
*/
public function reverse_update_data($steps)
{
$reversed_array = array();
foreach ($steps as $step)
{
$parts = explode('.', $step[0]);
$parameters = $step[1];
$class = $parts[0];
$method = isset($parts[1]) ? $parts[1] : false;
if ($class !== 'if' && $class !== 'custom')
{
array_unshift($parameters, $method);
$reversed_array[] = array($class . '.reverse', $parameters);
}
}
return array_reverse($reversed_array);
}
}