1: <?php
2: /**
3: * Magento
4: *
5: * NOTICE OF LICENSE
6: *
7: * This source file is subject to the Open Software License (OSL 3.0)
8: * that is bundled with this package in the file LICENSE.txt.
9: * It is also available through the world-wide-web at this URL:
10: * http://opensource.org/licenses/osl-3.0.php
11: * If you did not receive a copy of the license and are unable to
12: * obtain it through the world-wide-web, please send an email
13: * to license@magentocommerce.com so we can send you a copy immediately.
14: *
15: * DISCLAIMER
16: *
17: * Do not edit or add to this file if you wish to upgrade Magento to newer
18: * versions in the future. If you wish to customize Magento for your
19: * needs please refer to http://www.magentocommerce.com for more information.
20: *
21: * @category Mage
22: * @package Mage_ImportExport
23: * @copyright Copyright (c) 2012 Magento Inc. (http://www.magentocommerce.com)
24: * @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0)
25: */
26:
27:
28: /**
29: * ImportExport MySQL resource helper model
30: *
31: * @category Mage
32: * @package Mage_Sales
33: * @author Magento Core Team <core@magentocommerce.com>
34: */
35: class Mage_ImportExport_Model_Resource_Helper_Mysql4 extends Mage_Core_Model_Resource_Helper_Mysql4
36: {
37: /**
38: * Constants to be used for DB
39: */
40: const DB_MAX_PACKET_SIZE = 1048576; // Maximal packet length by default in MySQL
41: const DB_MAX_PACKET_COEFFICIENT = 0.85; // The coefficient of useful data from maximum packet length
42:
43: /**
44: * Returns maximum size of packet, that we can send to DB
45: *
46: * @return int
47: */
48: public function getMaxDataSize()
49: {
50: $maxPacketData = $this->_getReadAdapter()->fetchRow('SHOW VARIABLES LIKE "max_allowed_packet"');
51: $maxPacket = empty($maxPacketData['Value']) ? self::DB_MAX_PACKET_SIZE : $maxPacketData['Value'];
52: return floor($maxPacket * self::DB_MAX_PACKET_COEFFICIENT);
53: }
54:
55: /**
56: * Returns next autoincrement value for a table
57: *
58: * @param string $table Real table name in DB
59: * @return int
60: */
61: public function getNextAutoincrement($tableName)
62: {
63: $adapter = $this->_getReadAdapter();
64: $entityStatus = $adapter->showTableStatus($tableName);
65:
66: if (empty($entityStatus['Auto_increment'])) {
67: Mage::throwException(Mage::helper('importexport')->__('Cannot get autoincrement value'));
68: }
69: return $entityStatus['Auto_increment'];
70: }
71: }
72: