magento ------------------连接数据库-----进行操作的方法,方式!!!精***

magento连接数据库的方法:
1

简单方式。限制性小

1.1

$write = Mage::getSingleton('core/resource')->getConnection('core_write');
$readresult=$write->query("SELECT eav_attribute_option_value.option_id, eav_attribute_option_value.value FROM eav_attribute_option_value

INNER JOIN eav_attribute_option ON eav_attribute_option_value.option_id=eav_attribute_option.option_id WHERE

eav_attribute_option.attribute_id=505 AND eav_attribute_option_value.option_id IN (".$brands.")");

while ($row = $readresult->fetch() ) {
    $brandlist[] = array('value'=>$row['option_id'], 'label'=>$row['value']);
}

 

1.2

$resource = Mage::getSingleton('core/resource'); 
$read = $resource->getConnection('catalog_read');

 $select = $read->select()
//得到zend_db_select
                       ->from(array('cp'=>$categoryProductTable)) 
                       ->join(array('pei'=>$productEntityIntTable),'pei.entity_id=cp.product_id', array()) 
                       ->joinNatural(array('ea'=>$eavAttributeTable)) 
                       ->where('cp.category_id=?', $categoryId) 
                       ->where('pei.value=1') 
                       ->where('ea.attribute_code="terry"'); 
 
                       $rows = $read->fetchAll($select); 
    $ids = array();
          foreach($rows AS $row) { 
            $ids[] = $row['product_id']; 
        } 
        $ret = implode(',', $ids); 
        return $ids;

2
一般用于magento,产品,分类等信息的修改。
通过
此处一般说的是eav模型中的collection
 Mage_Catalog_Model_Resource_Eav_Mysql4_Product_Collection
只要实现了下面的类的类,
Varien_Data_Collection
都可以使用
 public function getSelect()
    {
        $this->_select = $this->_conn->select();
    return $this->_select;
    }
得到 Varien_Db_Select。
3
对于单个产品的查询和修改

根据ID值。或者唯一值。
$model  = Mage::getModel('blog/blog')->load($id);


该方式信息比较全面。

4
$coll = Mage::getModel('blog/tag')->getCollection();
       
        $sel = $coll->getSelect();
       
        $coll->getSelect()


5
对于Mage::getResourceModel()
和Mage::getModel()->getCollection();

得到的都是Get collection instance

_setResourceModel($resourceName, $resourceCollectionName=null)


5.1 Mage::getResourceModel()
和Mage::getModel()->getCollection()
和Eav模型,都可以使用getSelect();

6
Mage_Core_Model_Mysql4_Abstract


1
非eav模型:
1.1

resource collection model:
AW_Blog_Model_Mysql4_Blog_Collection extends Mage_Core_Model_Mysql4_Collection_Abstract
 Mage_Core_Model_Mysql4_Collection_Abstract extends Varien_Data_Collection_Db
Varien_Data_Collection_Db extends Varien_Data_Collection

1.2
resource model
AW_Blog_Model_Mysql4_Blog extends Mage_Core_Model_Mysql4_Abstract
Mage_Core_Model_Mysql4_Abstract extends Mage_Core_Model_Resource_Abstract




2
对于eav模型:
2.1
resource collection model:
Mage_Catalog_Model_Resource_Eav_Mysql4_Product_Collectionextends Mage_Catalog_Model_Resource_Eav_Mysql4_Collection_Abstract
Mage_Catalog_Model_Resource_Eav_Mysql4_Collection_Abstract extends Mage_Eav_Model_Entity_Collection_Abstract
Mage_Eav_Model_Entity_Collection_Abstract extends Varien_Data_Collection_Db
Varien_Data_Collection_Db extends Varien_Data_Collection


2.2
resource model
class Mage_Catalog_Model_Resource_Eav_Mysql4_Abstract extends Mage_Eav_Model_Entity_Abstract
Mage_Eav_Model_Entity_Abstract
    extends Mage_Core_Model_Resource_Abstract
    implements Mage_Eav_Model_Entity_Interface


model--->
_getResource(得到resource model)


在resource中,可以使用的方法:
_getReadAdapter()
_getWriteAdapter()---->进而可以通过方法 public function select()得到Varien_Db_Select;

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