app/code/core/Mage/Tax/sql/tax_setup/mysql4-upgrade-0.7.6-0.7.7.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Customer
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

$installer = $this;
/* @var $installer Mage_Core_Model_Resource_Setup  */

$installer->startSetup();

$installer->run("
 CREATE TABLE `{$installer->getTable('tax_calculation_rate')}` (
`tax_calculation_rate_id` INT NOT NULL AUTO_INCREMENT ,
`tax_country_id` CHAR( 2 ) NOT NULL ,
`tax_region_id` MEDIUMINT NOT NULL ,
`tax_postcode` VARCHAR( 12 ) NOT NULL ,
`code` VARCHAR( 255 ) NOT NULL ,
`rate` DECIMAL( 12, 4 ) NOT NULL ,
PRIMARY KEY ( `tax_calculation_rate_id` ),
KEY `IDX_TAX_CALCULATION_RATE` (`tax_country_id`, `tax_region_id`, `tax_postcode`),
KEY `IDX_TAX_CALCULATION_RATE_CODE` (`code`)
) ENGINE = InnoDB;

 CREATE TABLE `{$installer->getTable('tax_calculation_rate_title')}` (
`tax_calculation_rate_title_id` INT NOT NULL AUTO_INCREMENT ,
`tax_calculation_rate_id` INT NOT NULL ,
`store_id` SMALLINT( 5 ) UNSIGNED NOT NULL ,
`value` VARCHAR( 255 ) NOT NULL ,
PRIMARY KEY ( `tax_calculation_rate_title_id` ),
KEY `IDX_TAX_CALCULATION_RATE_TITLE` (`tax_calculation_rate_id`, `store_id`),
KEY `FK_TAX_CALCULATION_RATE_TITLE_RATE` (`tax_calculation_rate_id`),
KEY `FK_TAX_CALCULATION_RATE_TITLE_STORE` (`store_id`)
) ENGINE = InnoDB;

 CREATE TABLE `{$installer->getTable('tax_calculation_rule')}` (
`tax_calculation_rule_id` INT NOT NULL AUTO_INCREMENT ,
`code` VARCHAR( 255 ) NOT NULL ,
`priority` MEDIUMINT NOT NULL ,
`position` MEDIUMINT NOT NULL ,
PRIMARY KEY ( `tax_calculation_rule_id` ),
KEY `IDX_TAX_CALCULATION_RULE` (`priority`, `position`, `tax_calculation_rule_id`),
KEY `IDX_TAX_CALCULATION_RULE_CODE` (`code`)
) ENGINE = InnoDB;

 CREATE TABLE `{$installer->getTable('tax_calculation')}` (
`tax_calculation_rate_id` INT NOT NULL,
`tax_calculation_rule_id` INT NOT NULL ,
`customer_tax_class_id`   SMALLINT( 6 ) NOT NULL ,
`product_tax_class_id`    SMALLINT( 6 ) NOT NULL ,
KEY `FK_TAX_CALCULATION_RULE` (`tax_calculation_rule_id`),
KEY `FK_TAX_CALCULATION_RATE` (`tax_calculation_rate_id`),
KEY `FK_TAX_CALCULATION_CTC` (`customer_tax_class_id`),
KEY `FK_TAX_CALCULATION_PTC` (`product_tax_class_id`),
KEY `IDX_TAX_CALCULATION` (`tax_calculation_rate_id`, `customer_tax_class_id`, `product_tax_class_id`)
) ENGINE = InnoDB;
");


$installer->getConnection()->addConstraint('FK_TAX_CALCULATION_RATE_TITLE_RATE', $installer->getTable('tax_calculation_rate_title'), 'tax_calculation_rate_id', $installer->getTable('tax_calculation_rate'), 'tax_calculation_rate_id');
$installer->getConnection()->addConstraint('FK_TAX_CALCULATION_RATE_TITLE_STORE', $installer->getTable('tax_calculation_rate_title'), 'store_id', $installer->getTable('core_store'), 'store_id');

$installer->getConnection()->addConstraint('FK_TAX_CALCULATION_RULE', $installer->getTable('tax_calculation'), 'tax_calculation_rule_id', $installer->getTable('tax_calculation_rule'), 'tax_calculation_rule_id');
$installer->getConnection()->addConstraint('FK_TAX_CALCULATION_RATE', $installer->getTable('tax_calculation'), 'tax_calculation_rate_id', $installer->getTable('tax_calculation_rate'), 'tax_calculation_rate_id');
$installer->getConnection()->addConstraint('FK_TAX_CALCULATION_CTC', $installer->getTable('tax_calculation'), 'customer_tax_class_id', $installer->getTable('tax_class'), 'class_id');
$installer->getConnection()->addConstraint('FK_TAX_CALCULATION_PTC', $installer->getTable('tax_calculation'), 'product_tax_class_id', $installer->getTable('tax_class'), 'class_id');


$this->convertOldTaxData();


$installer->run("
DROP TABLE `{$installer->getTable('tax_rule')}`;
DROP TABLE `{$installer->getTable('tax_rate_type')}`;
DROP TABLE `{$installer->getTable('tax_rate_data')}`;
DROP TABLE `{$installer->getTable('tax_rate')}`;
");


$installer->endSetup();

---