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Code Editor : db_updater.php

<?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/>.

/**
 * Progress handler that updates a database table with the progress.
 *
 * @package    core
 * @copyright  2018 Matt Porritt <mattp@catalyst-au.net>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace core\progress;

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

/**
     * The primary key of the database record to update.
     *
     * @var integer
     */
    protected $recordid = 0;

/**
     * The database table to insert the progress updates into.
     *
     * @var string
     */
    protected $table = '';

/**
     * The table field to update with the progress.
     *
     * @var string
     */
    protected $field = '';

/**
     * The maximum frequency in seconds to update the database (default 5 seconds).
     * Lower values will increase database calls.
     *
     * @var integer
     */
    protected $interval = 5;

/**
     * The timestamp of when the next progress update to the database will be.
     *
     * @var integer
     */
    protected $nextupdate = 0;

/**
     * Constructs the progress reporter.
     *
     * @param int $recordid The primary key of the database record to update.
     * @param string $table The databse table to insert the progress updates into.
     * @param string $field The table field to update with the progress.
     * @param int $interval The maximum frequency in seconds to update the database (default 5 seconds).
     */
    public function __construct($recordid, $table, $field, $interval=5) {
        $this->recordid = $recordid;
        $this->table = $table;
        $this->field = $field;
        $this->interval = $interval;
    }

/**
     * Updates the progress in the database.
     * Database update frequency is set by $interval.
     *
     * @see \core\progress\base::update_progress()
     */
    public function update_progress() {
        global $DB;
        $now = $this->get_time();
        $lastprogress = $this->lastprogresstime != 0 ? $this->lastprogresstime : $now;

$progressrecord = new \stdClass();
        $progressrecord->id = $this->recordid;
        $progressrecord->{$this->field} = '';

// Update database with progress.
        if ($now > $this->nextupdate) {  // Limit database updates based on time.
            list ($min, $max) = $this->get_progress_proportion_range();

$progressrecord->{$this->field} = $min;
            $DB->update_record($this->table, $progressrecord);
            $this->nextupdate = $lastprogress + $this->interval;
        }

// Set progress to 1 (100%) when there are no more progress updates.
        // Their is no guarantee that the final update from the get progress method
        // will be 1 even for a successful process. So we explicitly set the final DB
        // value to 1 when we are no longer in progress.
        if (!$this->is_in_progress_section()) {
            $progressrecord->{$this->field} = 1;
            $DB->update_record($this->table, $progressrecord);
        }
    }
}

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Code Editor : db_updater.php