static public function get($sqlStatement, $variables = [])
    {
        if (!is_array(self::$_statements)) {
            self::init();
        }
        $sql = self::$_statements[$sqlStatement];
        if ($variables) {
            foreach ($variables as $variable => $value) {
                $sql = str_replace($variable, $value, $sql);
            }
        }
        return $sql;
    }