is magento sales eav | 易学教程

问题

By checking sales module's config, there is sales_entity section as below

<models>
<sales>
    <class>Mage_Sales_Model</class>
    <resourceModel>sales_resource</resourceModel>
</sales>
<sales_entity>
    <class>Mage_Sales_Model_Entity</class>
    <entities>
        <quote>

and those class Mage_Sales_Model_Entity_xxx extends Mage_Eav_Model_Entity_Abstract, showing that sales/order is EAV style but not flat one. I can also find table "eav_entity_type" have a lot of records related with "order".

But, I go through the code, sadly, EAV is not at last in place in current codebase (at least v1.7). Can anyone help to clarify? Is EAV for sales/order deperecated?

回答1:

In the latest versions of Magento (i.e. 1.6 and 1.7, can't say for earlier) the sales entity attributes are no longer stored in the EAV attribute-value tables. The resource models of the Mage_Sales module connect the sales entities to flat tables.

You can also see that the base Sales model class Mage_Sales_Model_Abstract extends Mage_Core_Model_Abstract, and the base Sales resource model Mage_Sales_Model_Resource_Abstract extends Mage_Core_Model_Resource_Db_Abstract - neither of those is an EAV model or an EAV resource model.

The attribute-entity metadata that you find in the table eav_entity_type is similar to the EAV entities of the Catalog and Customer modules, yet the attribute value storage system is not EAV.

I guess, the configuration you encountered is left for the backward compatibility.

I've put together a description of the Magento's EAV system, you may find it interesting: http://www.divisionlab.com/solvingmagento/magento-eav-system/

回答2:

I've compared old Magento versions and found a big difference on Sales Order Model between 2 versions 1.4.0.1 and 1.4.1.0

This file was added to create the sales_flat_order and remove Order EAV tables Mage/Sales/sql/mysql4-upgrade-1.3.99-1.4.0.0.php - Line 1144

// Remove previous tables
$tablesToDrop = array(
    'sales_order_entity_decimal',
    'sales_order_entity_datetime',
    'sales_order_entity_int',
    'sales_order_entity_text',
    'sales_order_entity_varchar',
    'sales_order_entity',
    'sales_order_decimal',
    'sales_order_datetime',
    'sales_order_int',
    'sales_order_text',
    'sales_order_varchar',
    'sales_order'
);

foreach ($tablesToDrop as $table) {
    $table = $installer->getTable($table);
    if (!$installer->tableExists($table)) {
        continue;
    }
    $installer->getConnection()->query(
        'DROP TABLE ' . $installer->getConnection()->quoteIdentifier($table)
    );
}

The resource class file Mage_Sales_Model_Mysql4_Order was changed to extends from Mage_Sales_Model_Mysql4_Order_Abstract instead of Mage_Eav_Model_Entity_Abstract

Magento also noted about the changes from EAV to flat sales on this version might be a very heavy operation.

I believe we can't use EAV for the orders as same as products or customers anymore.

来源：https://stackoverflow.com/questions/14622845/is-magento-sales-eav

标签

magento

entity-attribute-value