mapguesser/database/migrations/data/20200612_2124_map_area.php

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<?php
use MapGuesser\Database\Query\Modify;
use MapGuesser\Database\Query\Select;
use MapGuesser\Interfaces\Database\IResultSet;
use MapGuesser\Util\Geo\Bounds;
$select = new Select(\Container::$dbConnection, 'maps');
$select->columns(['id', 'bound_south_lat', 'bound_west_lng', 'bound_north_lat', 'bound_east_lng']);
$result = $select->execute();
while ($map = $result->fetch(IResultSet::FETCH_ASSOC)) {
$bounds = Bounds::createDirectly($map['bound_south_lat'], $map['bound_west_lng'], $map['bound_north_lat'], $map['bound_east_lng']);
$modify = new Modify(\Container::$dbConnection, 'maps');
$modify->setId($map['id']);
$modify->set('area', $bounds->calculateApproximateArea());
$modify->save();
}