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<?php
/*
** Zabbix
** Copyright (C) 2001-2023 Zabbix SIA
**
** This program 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.
**
** This program 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 this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
/**
* Database backend class for Oracle.
*/
class OracleDbBackend extends DbBackend {
/**
* Check if 'dbversion' table exists.
*
* @return boolean
*/
protected function checkDbVersionTable() {
$table_exists = DBfetch(DBselect("SELECT table_name FROM all_tables WHERE table_name='DBVERSION'"));
if (!$table_exists) {
$this->setError(_s('Unable to determine current Zabbix database version: %1$s.',
_s('the table "%1$s" was not found', 'dbversion')
));
return false;
}
return true;
}
/**
* Check is current connection contain requested cipher list.
*
* @return bool
*/
public function isConnectionSecure() {
$this->setError('Secure connection for Oracle is not supported.');
return false;
}
/**
* Create connection to database server.
*
* @param string $host Host name.
* @param string $port Port.
* @param string $user User name.
* @param string $password Password.
* @param string $dbname Database name.
* @param string $schema DB schema.
*
* @param
* @return resource|null
*/
public function connect($host, $port, $user, $password, $dbname, $schema) {
$connect = '';
if ($host) {
$connect = '//'.$host.(($port) ? ':'.$port : '').(($dbname) ? '/'.$dbname : '');
}
elseif ($dbname) {
$connect = $dbname;
}
$resource = @oci_connect($user, $password, $connect, 'UTF8');
if (!$resource) {
$ociError = oci_error();
$this->setError('Error connecting to database: '.$ociError['message']);
return null;
}
return $resource;
}
/**
* Initialize connection.
*
* @return bool
*/
public function init() {
DBexecute('ALTER SESSION SET NLS_NUMERIC_CHARACTERS='.zbx_dbstr('. '));
}
/**
* Create INSERT SQL query.
* Creation example:
* BEGIN
* INSERT INTO usrgrp (usrgrpid, name, gui_access, users_status, debug_mode)
* VALUES ('20', 'admins', '1', '0', '1');
* INSERT INTO usrgrp (usrgrpid, name, gui_access, users_status, debug_mode)
* VALUES ('21', 'users', '0', '0', '0');
* END;
*/
public function createInsertQuery($table, array $fields, array $values) {
$sql = 'BEGIN';
$fields = '('.implode(',', $fields).')';
foreach ($values as $row) {
$sql .= ' INSERT INTO '.$table.' '.$fields.' VALUES ('.implode(',', array_values($row)).');';
}
$sql .= ' END;';
return $sql;
}
/**
* Check database and table fields encoding.
*
* @return bool
*/
public function checkEncoding() {
return $this->checkDatabaseEncoding();
}
/**
* Check database schema encoding. On error will set warning message.
*
* @return bool
*/
protected function checkDatabaseEncoding() {
$row = DBfetch(DBselect('SELECT value,parameter FROM NLS_DATABASE_PARAMETERS'.
' WHERE '.dbConditionString('parameter', ['NLS_CHARACTERSET', 'NLS_NCHAR_CHARACTERSET']).
' AND '.dbConditionString('value', [ORACLE_UTF8_CHARSET, ORACLE_CESU8_CHARSET], true)
));
if ($row) {
$this->setWarning(_s('Incorrect parameter "%1$s" value: %2$s.', $row['parameter'],
_s('"%1$s" instead "%2$s"', $row['value'], ORACLE_UTF8_CHARSET.', '.ORACLE_CESU8_CHARSET)
));
}
return !$row;
}
/**
* Check if database is using IEEE754 compatible double precision columns.
*
* @return bool
*/
public function isDoubleIEEE754() {
global $DB;
$conditions_or = [
'(table_name=\'HISTORY\' AND column_name=\'VALUE\')',
'(table_name=\'TRENDS\' AND column_name IN (\'VALUE_MIN\', \'VALUE_AVG\', \'VALUE_MAX\'))'
];
$sql =
'SELECT COUNT(*) cnt FROM user_tab_columns'.
' WHERE data_type=\'BINARY_DOUBLE\' AND ('.implode(' OR ', $conditions_or).')';
$result = DBfetch(DBselect($sql));
return (is_array($result) && array_key_exists('cnt', $result) && $result['cnt'] == 4);
}
/**
* @inheritdoc
*/
public function dbFieldExists(string $table_name, string $field_name): bool {
return (bool) DBFetch(DBselect(
'SELECT 1'.
' FROM col'.
' WHERE lower(tname)='.zbx_dbstr($table_name).
' AND lower(cname)='.zbx_dbstr($field_name)
));
}
}
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