Magento: Mage::getResourceModel, Mage::getModel 和 Mage::getSingleton() 的区别 when to use Mage::getResourceModel, Mage::getModel and Mage::getSingleton()

Perfect differece with example for getsingleton and getmodel.

Mage::getSingleton()

Mage::getSingleton() will first check if the same class instance exists or not in the memory. If the instance exists then it will return the same object from the memory. So Mage::getSingleton() is faster than Mage::getModel().

Example

$product1 = Mage::getSingleton('catalog/product');
$product2 = Mage::getSingleton('catalog/product');

$product1 and $product2 both will share same memory of OS and return only one instance each time.

Mage::getModel()

Mage::getModel() will create a new instance of an object each time even such object exists in configuration.

Example

$product1 = Mage::getModel('catalog/product');
$product2 = Mage::getModel('catalog/product');

$product1 and $product2 both have different instant of same object and also occupy different memory

Mage::getResourceModel()

As far as I know, all collections in Magento are resource models. They are instantiated by

Mage::getResourceModel()

or

Mage::getModel()->getCollection()

(说白了就是:Mage::getResourceModel('module/model_collection') 相当于 Mage::getModel('module/model')->getCollection())

It doesn’t really matter which function you use; the latter one simply calls the first one. The Magento team simply chose to make collections part of the resource, probably because collections need to query the database a lot. Usually, you will not have to call Mage::getResourceModel() for anything else than collections.

参考:http://stackoverflow.com/a/21154019/602382

实例:Magento: 获取客户信息 Get Customer’s Full Name, First Name, Last Name and Email Address

 

本文:Magento: Mage::getResourceModel, Mage::getModel 和 Mage::getSingleton() 的区别 when to use Mage::getResourceModel, Mage::getModel and Mage::getSingleton()

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