一个简单的magento模型，实体配置

<?xml version="1.0" encoding="UTF-8"?><config><modules><App_Helloworld><version>0.2.0</version></App_Helloworld></modules><global> <models> <helloworld>         <class>App_Helloworld_Model</class>         <resourceModel>helloworld_mysql4</resourceModel>     </helloworld>         <helloworld_mysql4>        <class>App_Helloworld_Model_Resource_Mysql4</class>        <entities>            <blogpost>                <table>blog_posts</table>            </blogpost>        </entities>     </helloworld_mysql4>        </models> <!--resource 可略，使用默认 -->     <resources>     <helloworld_write>         <connection>             <use>default_write</use>         </connection>     </helloworld_write>     <helloworld_read>         <connection>             <use>default_read</use>         </connection>     </helloworld_read>       </resources></global></config>