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efrain |
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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 2 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* sqlsrv specific recordset.
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*
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* @package core_dml
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* @copyright 2009 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v2 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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require_once(__DIR__.'/moodle_recordset.php');
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class sqlsrv_native_moodle_recordset extends moodle_recordset {
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protected $rsrc;
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protected $current;
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/** @var array recordset buffer */
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protected $buffer = null;
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/** @var sqlsrv_native_moodle_database */
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protected $db;
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public function __construct($rsrc, sqlsrv_native_moodle_database $db) {
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$this->rsrc = $rsrc;
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$this->current = $this->fetch_next();
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$this->db = $db;
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}
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/**
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* Inform existing open recordsets that transaction
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* is starting, this works around MARS problem described
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* in MDL-37734.
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*/
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public function transaction_starts() {
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if ($this->buffer !== null) {
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$this->unregister();
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return;
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}
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if (!$this->rsrc) {
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$this->unregister();
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return;
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}
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// This might eat memory pretty quickly...
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raise_memory_limit('2G');
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$this->buffer = array();
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while($next = $this->fetch_next()) {
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$this->buffer[] = $next;
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}
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}
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/**
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* Unregister recordset from the global list of open recordsets.
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*/
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private function unregister() {
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if ($this->db) {
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$this->db->recordset_closed($this);
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$this->db = null;
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}
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}
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public function __destruct() {
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$this->close();
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}
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private function fetch_next() {
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if (!$this->rsrc) {
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return false;
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}
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if (!$row = sqlsrv_fetch_array($this->rsrc, SQLSRV_FETCH_ASSOC)) {
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if (is_resource($this->rsrc)) {
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// We need to make sure that the statement resource is in the correct type before freeing it.
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sqlsrv_free_stmt($this->rsrc);
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}
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$this->rsrc = null;
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$this->unregister();
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return false;
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}
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unset($row['sqlsrvrownumber']);
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$row = array_change_key_case($row, CASE_LOWER);
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// Moodle expects everything from DB as strings.
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foreach ($row as $k=>$v) {
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if (is_null($v)) {
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continue;
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}
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if (!is_string($v)) {
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$row[$k] = (string)$v;
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}
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}
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return $row;
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}
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public function current(): stdClass {
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return (object)$this->current;
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}
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#[\ReturnTypeWillChange]
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public function key() {
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// return first column value as key
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if (!$this->current) {
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return false;
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}
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$key = reset($this->current);
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return $key;
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}
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public function next(): void {
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if ($this->buffer === null) {
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$this->current = $this->fetch_next();
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} else {
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$this->current = array_shift($this->buffer);
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}
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}
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public function valid(): bool {
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return !empty($this->current);
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}
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public function close() {
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if ($this->rsrc) {
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if (is_resource($this->rsrc)) {
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// We need to make sure that the statement resource is in the correct type before freeing it.
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sqlsrv_free_stmt($this->rsrc);
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}
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$this->rsrc = null;
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}
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$this->current = null;
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$this->buffer = null;
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$this->unregister();
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}
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}
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