cakephp中的datasources

cakephp中的数据源其实是个好东西,假如你有多种形式的数据源,比如REST,RSS, 

 JSON等,你可以编写cakephp的插件,去读取这些数据源.本文以编写一个读取RSS格式数据源 

 的做例子,讲解其使用. 


    代码在http://www.loadsys.com/files/rss_source.zip中可以下载, 

 把解压的代码放在/app/models/datasources 下,并设置 

 app/config/database.php如下 


   var $codeforestNews = array(  


   'datasource' => 'rss',  


     'feedUrl' => 'http://feeds.feedburner.com/codeforest',  


    'encoding' => 'UTF-8',  


    'cacheTime' => '+1 day',  


 ); 

   接着,创建 

 /app/models/codeforest_news.php 

 class CodeforestNews extends AppModel {  


           var $useTable = false;  


           var $useDbConfig = 'codeforestNews';  


 } 

   这里说明了,不使用数据库中的表,而直接使用datasource作为数据源 

 再看控制层: 

 class NewsController extends AppController {  


         var $name = 'News';  


        var $uses = array('CodeforestNews');  


     


         function index() {  


                 $this->paginate = array(  


                         'limit' => 10,  


                         'order' => array(  


                                 'CodeforestNews.pubDate' => 'desc',  


                          ),  


                 );  


                  $this->set('news',  $this->paginate('CodeforestNews') );  


         }  


 } 

   可以看到，甚至是可以排序的. 

 在页面中: 

   

 <?php foreach( $news as $newsItem ) : ?> 

         <?php echo $html->link($newsItem['CodeforestNews']['title'], $newsItem['CodeforestNews']['link']); ?><br/> 

         <em><?php echo $newsItem['CodeforestNews']['pubDate']; ?></em> 

         <hr> 

 <?php endforeach; ?> 

 <div class="paging"> 

         <?php echo $paginator->prev('<< '.__('previous', true), array(), null, array('class'=>'disabled'));?> 

 |      <?php echo $paginator->numbers();?> 

         <?php echo $paginator->next(__('next', true).' >>', array(), null, array('class'=>'disabled'));?> 

 </div> 


 DEMO效果为: 

​​​ http://www.codeforest.net/demo/cake_data_sources/news/index/page:2 
​​​
 查看CAKEPHP手册,可以知道,要写datasources,实现如下方法之一即可: 

 create($model, $fields = array(), $values = array()) 

 read($model, $queryData = array()) 

 update($model, $fields = array(), $values = array()) 

 delete($model, $id = null)