1<?php
2/*
3** Zabbix
4** Copyright (C) 2001-2021 Zabbix SIA
5**
6** This program is free software; you can redistribute it and/or modify
7** it under the terms of the GNU General Public License as published by
8** the Free Software Foundation; either version 2 of the License, or
9** (at your option) any later version.
10**
11** This program is distributed in the hope that it will be useful,
12** but WITHOUT ANY WARRANTY; without even the implied warranty of
13** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14** GNU General Public License for more details.
15**
16** You should have received a copy of the GNU General Public License
17** along with this program; if not, write to the Free Software
18** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
19**/
20
21
22/**
23 * Database backend class for DB2.
24 */
25class Db2DbBackend extends DbBackend {
26
27	/**
28	 * Check if 'dbversion' table exists.
29	 *
30	 * @return boolean
31	 */
32	protected function checkDbVersionTable() {
33		global $DB;
34
35		$schema = zbx_dbstr(!empty($DB['SCHEMA']) ? $DB['SCHEMA'] : strtoupper($DB['USER']));
36		$table_exists = DBfetch(DBselect(
37			'SELECT 1 FROM SYSCAT.TABLES'.
38			" WHERE TABNAME='DBVERSION'".
39				" AND TABSCHEMA=".$schema
40		));
41
42		if (!$table_exists) {
43			$this->setError(_s('Unable to determine current Zabbix database version: %1$s.',
44				_s('the table "%1$s" was not found', 'dbversion')
45			));
46
47			return false;
48		}
49
50		return true;
51	}
52
53	/**
54	 * Check database and table fields encoding.
55	 *
56	 * @return bool
57	 */
58	public function checkEncoding() {
59		return true;
60	}
61}
62