C:/xampp/htdocs/moodle/lib/dml/moodle_transaction.php

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<?php

// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.


defined('MOODLE_INTERNAL') || die();

class moodle_transaction {
    private $start_backtrace;
    private $database = null;

    public function __construct($database) {
        $this->database = $database;
        $this->start_backtrace = debug_backtrace();
        array_shift($this->start_backtrace);
    }

    public function get_backtrace() {
        return $this->start_backtrace;
    }

    public function is_disposed() {
        return empty($this->database);
    }

    public function dispose() {
        return $this->database = null;
    }

    public function allow_commit() {
        if ($this->is_disposed()) {
            throw new dml_transaction_exception('Transactions already disposed', $this);
        }
        $this->database->commit_delegated_transaction($this);
    }

    public function rollback(Exception $e) {
        if ($this->is_disposed()) {
            throw new dml_transaction_exception('Transactions already disposed', $this);
        }
        $this->database->rollback_delegated_transaction($this, $e);
    }
}