请问一下这个方法是干什么的呢？ [ 2.0 版本 ]

public function all($db = null)
{
    if ($this->emulateExecution) {
        return [];
    }

    // TODO add support for orderBy
    $data = $this->executeScript($db, 'All');
    if (empty($data)) {
        return [];
    }
    $rows = [];
    foreach ($data as $dataRow) {
        $row = [];
        $c = count($dataRow);
        for ($i = 0; $i < $c;) {
            $row[$dataRow[$i++]] = $dataRow[$i++];
        }

        $rows[] = $row;
    }
    if (!empty($rows)) {
        $models = $this->createModels($rows);
        if (!empty($this->with)) {
            $this->findWith($this->with, $models);
        }
        if (!$this->asArray) {
            foreach ($models as $model) {
                $model->afterFind();
            }
        }

        return $models;
    } else {
        return [];
    }
}