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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 2 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/>. /** * sqlsrv specific recordset. * * @package core_dml * @copyright 2009 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com} * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v2 or later */ defined('MOODLE_INTERNAL') || die(); require_once(__DIR__.'/moodle_recordset.php'); class sqlsrv_native_moodle_recordset extends moodle_recordset { protected $rsrc; protected $current; /** @var array recordset buffer */ protected $buffer = null; /** @var sqlsrv_native_moodle_database */ protected $db; public function __construct($rsrc, sqlsrv_native_moodle_database $db) { $this->rsrc = $rsrc; $this->current = $this->fetch_next(); $this->db = $db; } /** * Inform existing open recordsets that transaction * is starting, this works around MARS problem described * in MDL-37734. */ public function transaction_starts() { if ($this->buffer !== null) { $this->unregister(); return; } if (!$this->rsrc) { $this->unregister(); return; } // This might eat memory pretty quickly... raise_memory_limit('2G'); $this->buffer = array(); while($next = $this->fetch_next()) { $this->buffer[] = $next; } } /** * Unregister recordset from the global list of open recordsets. */ private function unregister() { if ($this->db) { $this->db->recordset_closed($this); $this->db = null; } } public function __destruct() { $this->close(); } private function fetch_next() { if (!$this->rsrc) { return false; } if (!$row = sqlsrv_fetch_array($this->rsrc, SQLSRV_FETCH_ASSOC)) { sqlsrv_free_stmt($this->rsrc); $this->rsrc = null; $this->unregister(); return false; } unset($row['sqlsrvrownumber']); $row = array_change_key_case($row, CASE_LOWER); // Moodle expects everything from DB as strings. foreach ($row as $k=>$v) { if (is_null($v)) { continue; } if (!is_string($v)) { $row[$k] = (string)$v; } } 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 $key; } public function next() { if ($this->buffer === null) { $this->current = $this->fetch_next(); } else { $this->current = array_shift($this->buffer); } } public function valid() { return !empty($this->current); } public function close() { if ($this->rsrc) { sqlsrv_free_stmt($this->rsrc); $this->rsrc = null; } $this->current = null; $this->buffer = null; $this->unregister(); } }