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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/>.
/**
* OCI specific temptables store. Needed because temporary tables
* in Oracle are global (to all sessions), so we need to rename them
* on the fly in order to get local (different for each session) table names.
* Also used to be able to retrieve temp table names included in the get_tables()
* method of the DB.
*
* @package core_dml
* @copyright 2009 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
require_once(__DIR__.'/moodle_temptables.php');
class oci_native_moodle_temptables extends moodle_temptables {
/** @var int To store unique_session_id. Needed for temp tables unique naming (upto 24cc) */
protected $unique_session_id; //
/** @var int To get incrementally different temptable names on each add_temptable() request */
protected $counter;
/**
* Creates new moodle_temptables instance
* @param object moodle_database instance
*/
public function __construct($mdb, $unique_session_id) {
$this->unique_session_id = $unique_session_id;
$this->counter = 1;
parent::__construct($mdb);
}
/**
* Add one temptable to the store.
*
* Overridden because OCI only support global temptables, so we need to change completely the name, based
* in unique session identifier, to get local-like temp tables support
* tables before the prefix.
*
* Given one moodle temptable name (without prefix), add it to the store, with the
* key being the original moodle name and the value being the real db temptable name
* already prefixed
*
* Override and use this *only* if the database requires modification in the table name.
*
* @param string $tablename name without prefix of the table created as temptable
*/
public function add_temptable($tablename) {
// TODO: throw exception if exists: if ($this->is_temptable...
$this->temptables[$tablename] = $this->prefix . $this->unique_session_id . $this->counter;
$this->counter++;
}
}