这里是Magento一个小示例来解释如何修改订单网格。订单网格的主类是“Mage_Adminhtml_Block_Sales_Order_Grid”，如果你想添加一些列，你必须重写这个类（块）。

如何重写magento块

<blocks>
    <adminhtml>
        <rewrite>
            <sales_order_grid>Alwayly_Test_Block_Adminhtml_Order_Grid</sales_order_grid>
        </rewrite>
    </adminhtml>
</blocks>

如果你调用“adminhtml/sales_order_grid”，你将获取Alwayly_Test_Block_Adminhtml_Order_Grid，那么创建Alwayly_Test_Block_Adminhtml_Order_Grid吧。下面是我的代码：

< ?php
class Alwayly_Test_Block_Adminhtml_Order_Grid extends Mage_Adminhtml_Block_Widget_Grid
{
     public function __construct()
    {
        parent::__construct();
        $this->setId('sales_order_grid');
        $this->setUseAjax(true);
        $this->setDefaultSort('created_at');
        $this->setDefaultDir('DESC');
        $this->setSaveParametersInSession(true);
    }
 
    /**
     * Retrieve collection class
     *
     * @return string
     */
    protected function _getCollectionClass()
    {
        return 'sales/order_grid_collection';
    }
 
    protected function _prepareCollection()
    {
        $collection = Mage::getResourceModel($this->_getCollectionClass());
 
        //we changed mysql query, we added inner join to order item table
        $collection->join('sales/order_item', 'order_id=entity_id', array('name'=>'name', 'sku' =>'sku', 'qty_ordered'=>'qty_ordered' ), null,'left');
        $this->setCollection($collection);
        return parent::_prepareCollection();
    }
 
    protected function _prepareColumns()
    {
 
        $this->addColumn('real_order_id', array(
            'header'=> Mage::helper('sales')->__('Order #'),
            'width' => '80px',
            'type'  => 'text',
            'index' => 'increment_id',
        ));
 
        if (!Mage::app()->isSingleStoreMode()) {
            $this->addColumn('store_id', array(
                'header'    => Mage::helper('sales')->__('Purchased from (store)'),
                'index'     => 'store_id',
                'type'      => 'store',
                'store_view'=> true,
                'display_deleted' => true,
                'filter_index' => 'main_table.store_id'
            ));
        }
 
        $this->addColumn('created_at', array(
            'header' => Mage::helper('sales')->__('Purchased On'),
            'index' => 'created_at',
            'type' => 'datetime',
            'width' => '100px',
            'filter_index' => 'main_table.created_at'
        ));
 
        $this->addColumn('billing_name', array(
            'header' => Mage::helper('sales')->__('Bill to Name'),
            'index' => 'billing_name',
        ));
 
        $this->addColumn('qty_ordered', array(
            'header'    => Mage::helper('sales')->__('Items Ordered'),
            'index'     => 'qty_ordered',
            'type'      => 'number',
            'total'     => 'sum'
        ));
 
        $this->addColumn('sku', array(
            'header'    => Mage::helper('catalog')->__('SKU'),
            'index'     => 'sku',
			'type' => 'text'
        ));
 
        $this->addColumn('base_grand_total', array(
            'header' => Mage::helper('sales')->__('G.T. (Base)'),
            'index' => 'base_grand_total',
            'type'  => 'currency',
            'currency' => 'base_currency_code',
        ));
 
        $this->addColumn('grand_total', array(
            'header' => Mage::helper('sales')->__('G.T. (Purchased)'),
            'index' => 'grand_total',
            'type'  => 'currency',
            'currency' => 'order_currency_code',
        ));
 
        $this->addColumn('status', array(
            'header' => Mage::helper('sales')->__('Status'),
            'index' => 'status',
            'type'  => 'options',
            'width' => '70px',
            'options' => Mage::getSingleton('sales/order_config')->getStatuses(),
        ));
 
 
        return $this;
    }
 
    protected function _prepareMassaction()
    {
        $this->setMassactionIdField('entity_id');
        $this->getMassactionBlock()->setFormFieldName('order_ids');
        $this->getMassactionBlock()->setUseSelectAll(false);
 
        if (Mage::getSingleton('admin/session')->isAllowed('sales/order/actions/cancel')) {
            $this->getMassactionBlock()->addItem('cancel_order', array(
                 'label'=> Mage::helper('sales')->__('Cancel'),
                 'url'  => $this->getUrl('*/sales_order/massCancel'),
            ));
        }
 
        if (Mage::getSingleton('admin/session')->isAllowed('sales/order/actions/hold')) {
            $this->getMassactionBlock()->addItem('hold_order', array(
                 'label'=> Mage::helper('sales')->__('Hold'),
                 'url'  => $this->getUrl('*/sales_order/massHold'),
            ));
        }
 
        if (Mage::getSingleton('admin/session')->isAllowed('sales/order/actions/unhold')) {
            $this->getMassactionBlock()->addItem('unhold_order', array(
                 'label'=> Mage::helper('sales')->__('Unhold'),
                 'url'  => $this->getUrl('*/sales_order/massUnhold'),
            ));
        }
 
        $this->getMassactionBlock()->addItem('pdfinvoices_order', array(
             'label'=> Mage::helper('sales')->__('Print Invoices'),
             'url'  => $this->getUrl('*/sales_order/pdfinvoices'),
        ));
 
        $this->getMassactionBlock()->addItem('pdfshipments_order', array(
             'label'=> Mage::helper('sales')->__('Print Packingslips'),
             'url'  => $this->getUrl('*/sales_order/pdfshipments'),
        ));
 
        $this->getMassactionBlock()->addItem('pdfcreditmemos_order', array(
             'label'=> Mage::helper('sales')->__('Print Credit Memos'),
             'url'  => $this->getUrl('*/sales_order/pdfcreditmemos'),
        ));
 
        $this->getMassactionBlock()->addItem('pdfdocs_order', array(
             'label'=> Mage::helper('sales')->__('Print All'),
             'url'  => $this->getUrl('*/sales_order/pdfdocs'),
        ));
 
        return $this;
    }
 
    public function getRowUrl($row)
    {
        if (Mage::getSingleton('admin/session')->isAllowed('sales/order/actions/view')) {
            return $this->getUrl('*/sales_order/view', array('order_id' => $row->getId()));
        }
        return false;
    }
    public function getGridUrl()
    {
        return $this->getUrl('*/*/grid', array('_current'=>true));
    }
}

如果你想添加一些列，你需要添加下面的代码到 _prepareColumns方法：

$this->addColumn('sku', array(
'header'    => Mage::helper('catalog')->__('SKU'),
'index'     => 'sku',
'type' => 'text'
));

如你所见，我们修改了_prepareCollection()方法。我们改变了SQL语句，连接了第二张数据表。这只是我的例子，你可以根据你的需求来修改SQL语句。