C:/xampp/htdocs/moodle/lib/dtl/database_exporter.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();

abstract class database_exporter {
    protected $mdb;
    protected $manager;
    protected $schema;
    protected $check_schema;

    public function __construct(moodle_database $mdb, $check_schema=true) {
        $this->mdb          = $mdb;
        $this->manager      = $mdb->get_manager();
        $this->schema       = $this->manager->get_install_xml_schema();
        $this->check_schema = $check_schema;
    }

    public abstract function begin_database_export($version, $release, $timestamp, $description);

    public abstract function begin_table_export(xmldb_table $table);

    public abstract function finish_table_export(xmldb_table $table);

    public abstract function finish_database_export();

    public abstract function export_table_data(xmldb_table $table, $data);

    public function export_database($description=null) {
        global $CFG;

        if ($this->check_schema and $errors = $this->manager->check_database_schema($this->schema)) {
            $details = '';
            foreach ($errors as $table=>$items) {
                $details .= '<div>'.get_string('table').' '.$table.':';
                $details .= '<ul>';
                foreach ($items as $item) {
                    $details .= '<li>'.$item.'</li>';
                }
                $details .= '</ul></div>';
            }
            throw new dbtransfer_exception('exportschemaexception', $details);
        }
        $tables = $this->schema->getTables();
        $this->begin_database_export($CFG->version, $CFG->release, date('c'), $description);
        foreach ($tables as $table) {
            $rs = $this->mdb->get_recordset_sql('SELECT * FROM {'.$table->getName().'}');
            if (!$rs) {
                throw new ddl_table_missing_exception($table->getName());
            }
            $this->begin_table_export($table);
            foreach ($rs as $row) {
                $this->export_table_data($table, $row);
            }
            $this->finish_table_export($table);
        }
        $this->finish_database_export();
    }

}