Search moodle.org's
Developer Documentation

See Release Notes

  • Bug fixes for general core bugs in 3.10.x will end 8 November 2021 (12 months).
  • Bug fixes for security issues in 3.10.x will end 9 May 2022 (18 months).
  • PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.
<?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/>.

/**
 * Native postgresql recordset.
 *
 * @package    core_dml
 * @copyright  2008 Petr Skoda (http://skodak.org)
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

require_once(__DIR__.'/moodle_recordset.php');

/**
 * pgsql specific moodle recordset class
 *
 * @package    core_dml
 * @copyright  2008 Petr Skoda (http://skodak.org)
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class pgsql_native_moodle_recordset extends moodle_recordset {

    protected $result;
    /** @var current row as array.*/
    protected $current;
    protected $blobs = array();

    /** @var string Name of cursor or '' if none */
    protected $cursorname;

    /** @var pgsql_native_moodle_database Postgres database resource */
    protected $db;

    /** @var bool True if there are no more rows to fetch from the cursor */
    protected $lastbatch;

    /**
     * Build a new recordset to iterate over.
     *
     * When using cursors, $result will be null initially.
     *
     * @param resource|null $result A pg_query() result object to create a recordset from.
     * @param pgsql_native_moodle_database $db Database object (only required when using cursors)
     * @param string $cursorname Name of cursor or '' if none
     */
    public function __construct($result, pgsql_native_moodle_database $db = null, $cursorname = '') {
        if ($cursorname && !$db) {
            throw new coding_exception('When specifying a cursor, $db is required');
        }
        $this->result = $result;
        $this->db = $db;
        $this->cursorname = $cursorname;

        // When there is a cursor, do the initial fetch.
        if ($cursorname) {
            $this->fetch_cursor_block();
        }

        // Find out if there are any blobs.
        $numfields = pg_num_fields($this->result);
        for ($i = 0; $i < $numfields; $i++) {
< $type = pg_field_type($this->result, $i);
> $type = $this->db->pg_field_type($this->result, $i);
if ($type == 'bytea') { $this->blobs[] = pg_field_name($this->result, $i); } } $this->current = $this->fetch_next(); } /** * Fetches the next block of data when using cursors. * * @throws coding_exception If you call this when the fetch buffer wasn't freed yet */ protected function fetch_cursor_block() { if ($this->result) { throw new coding_exception('Unexpected non-empty result when fetching from cursor'); } list($this->result, $this->lastbatch) = $this->db->fetch_from_cursor($this->cursorname); if (!$this->result) { throw new coding_exception('Unexpected failure when fetching from cursor'); } } public function __destruct() { $this->close(); } private function fetch_next() { if (!$this->result) { return false; } if (!$row = pg_fetch_assoc($this->result)) { // There are no more rows in this result. pg_free_result($this->result); $this->result = null; // If using a cursor, can we fetch the next block? if ($this->cursorname && !$this->lastbatch) { $this->fetch_cursor_block(); if (!$row = pg_fetch_assoc($this->result)) { pg_free_result($this->result); $this->result = null; return false; } } else { return false; } } if ($this->blobs) { foreach ($this->blobs as $blob) { $row[$blob] = $row[$blob] !== null ? pg_unescape_bytea($row[$blob]) : null; } } return $row; } public function current() { return (object)$this->current; } public function key() { // return first column value as key if (!$this->current) { return false; } $key = reset($this->current); return $key; } public function next() { $this->current = $this->fetch_next(); } public function valid() { return !empty($this->current); } public function close() { if ($this->result) { pg_free_result($this->result); $this->result = null; } $this->current = null; $this->blobs = null; // If using cursors, close the cursor. if ($this->cursorname) { $this->db->close_cursor($this->cursorname); $this->cursorname = null; } } }