PHP MVC模式在网站架构中的实现(1)(2)

＜?php 
/** 
*  Fetches "products" from the database 
*/ 
class ProductModel { 
    /** 
    * Private 
    * $dao an instance of the DataAccess class 
    */ 
    var $dao; 

    //! A constructor. 
    /** 
    * Constucts a new ProductModel object 
    * @param $dbobject an instance of the DataAccess class 
    */ 
    function ProductModel (&$dao) { 
        $this-＞dao=& $dao; 
    } 

    //! A manipulator 
    /** 
    * Tells the $dboject to store this query as a resource 
    * @param $start the row to start from 
    * @param $rows the number of rows to fetch 
    * @return void 
    */ 
    function listProducts($start=1,$rows=50) { 
   $this-＞dao-＞fetch("SELECT * FROM products LIMIT ".$start.", ".$rows); 
    } 

    //! A manipulator 
    /** 
    * Tells the $dboject to store this query as a resource 
    * @param $id a primary key for a row 
    * @return void 
    */ 
    function listProduct($id) { 
 $this-＞dao-＞fetch("SELECT * FROM products WHERE PRODUCTID='".$id."'"); 
    } 

    //! A manipulator 
    /** 
    * Fetches a product as an associative array from the $dbobject 
    * @return mixed 
    */ 
    function getProduct() { 
        if ( $product=$this-＞dao-＞getRow() ) 
            return $product; 
        else 
            return false; 
    } 
} 
?＞

＜?php 
/** 
*  Binds product data to HTML rendering 
*/ 
class ProductView { 
    /** 
    * Private 
    * $model an instance of the ProductModel class 
    */ 
    var $model; 

    /** 
    * Private 
    * $output rendered HTML is stored here for display 
    */ 
    var $output; 

    //! A constructor. 
    /** 
    * Constucts a new ProductView object 
    * @param $model an instance of the ProductModel class 
    */ 
    function ProductView (&$model) { 
        $this-＞model=& $model; 
    } 

    //! A manipulator 
    /** 
    * Builds the top of an HTML page 
    * @return void 
    */ 
    function header () { 

    } 

    //! A manipulator 
    /** 
    * Builds the bottom of an HTML page 
    * @return void 
    */ 
    function footer () { 

    } 

    //! A manipulator 
    /** 
    * Displays a single product 
    * @return void 
    */ 
    function productItem($id=1) { 
        $this-＞model-＞listProduct($id); 
     while ( $product=$this-＞model-＞getProduct() ) { 
             // Bind data to HTML 
        } 
    } 

    //! A manipulator 
    /** 
    * Builds a product table 
    * @return void 
    */ 
    function productTable($rownum=1) { 
        $rowsperpage='20'; 
     $this-＞model-＞listProducts($rownum,$rowsperpage); 
     while ( $product=$this-＞model-＞getProduct() ) { 
             // Bind data to HTML 
        } 
    } 

    //! An accessor 
    /** 
    * Returns the rendered HTML 
    * @return string 
    */ 
    function display () { 
        return $this-＞output; 
    } 
} 
?＞