public function tax_calculation_rate()
{
$items = Mage::getModel('tax/calculation_rate')->getCollection()->getItems();
foreach ($items as $item) {
$item->delete();
}
$this->conn->query('ALTER TABLE `tax_calculation_rate` AUTO_INCREMENT=1');
foreach ($this->objects['tax_calculation_rate'] as $item) {
$model = new Mage_Tax_Model_Calculation_Rate();
foreach ($item as $key => $value) {
$model->setData($key, $value);
}
try {
$model->save();
} catch (Exception $e) {
mage::d($e->getMessage());
}
}
}