PHP MVC模式在网站架构中的实现分析_PHP教程

＜p＞{some_text}＜/p＞ <BR>＜p＞{some_more_text}＜/p＞

＜?php <BR>switch ($_GET['viewpage']) { <BR> case "news": <BR>  $page=new NewsRenderer; <BR> break; <BR> case "links": <BR>  $page=new LinksRenderer; <BR> break; <BR> default: <BR>  $page=new HomePageRenderer; <BR> break; <BR>} <BR>$page-＞display(); <BR>?＞

＜?php <BR>/** <BR>* A simple class for querying <U><STRONG><FONT color=#6466b3>MySQL</FONT></STRONG></U> <BR>*/ <BR>class DataAccess { <BR> /** <BR> * Private <BR> * $db stores a database resource <BR> */ <BR> var $db; <BR> /** <BR> * Private <BR> * $query stores a query resource <BR> */ <BR> var $query; // Query resource <br><br> //! A constructor. <BR> /** <BR> * Constucts a new DataAccess object <BR> * @param $host string hostname for dbserver <BR> * @param $user string dbserver user <BR> * @param $pass string dbserver user password <BR> * @param $db string database name <BR> */ <BR> function DataAccess ($host,$user,$pass,$db) { <BR>  $this-＞db=mysql_pconnect($host,$user,$pass); <BR>  mysql_select_db($db,$this-＞db); <BR> } <br><br> //! An accessor <BR> /** <BR> * Fetches a query resources and stores it in a local member <BR> * @param $sql string the database query to run <BR> * @return void <BR> */ <BR> function fetch($sql) { <BR> $this-＞query=mysql_unbuffered_query($sql,$this-＞db)

; // Perform query here <BR> } <br><br> //! An accessor <BR> /** <BR> * Returns an associative array of a query row <BR> * @return mixed <BR> */ <BR> function getRow () { <BR>  if ( $row=mysql_fetch_array($this-＞query,MYSQL_ASSOC) ) <BR>   return $row; <BR>  else <BR>   return false; <BR> } <BR>} <BR>?＞

＜?php <BR>/** <BR>* Fetches "products" from the database <BR>*/ <BR>class ProductModel { <BR> /** <BR> * Private <BR> * $dao an instance of the DataAccess class <BR> */ <BR> var $dao; <br><br> //! A constructor. <BR> /** <BR> * Constucts a new ProductModel object <BR> * @param $dbobject an instance of the DataAccess class <BR> */ <BR> function ProductModel (&$dao) { <BR>  $this-＞dao=& $dao; <BR> } <br><br> //! A manipulator <BR> /** <BR> * Tells the $dboject to store this query as a resource <BR> * @param $start the row to start from <BR> * @param $rows the number of rows to fetch <BR> * @return void <BR> */ <BR> function listProducts($start=1,$rows=50) { <BR> $this-＞dao-＞fetch("SELECT * FROM products LIMIT ".$start.", ".$rows); <BR> } <br><br> //! A manipulator <BR> /** <BR> * Tells the $dboject to store this query as a resource <BR> * @param $id a primary key for a row <BR> * @return void <BR> */ <BR> function listProduct($id) { <BR> $this-＞dao-＞fetch("SELECT * FROM products WHERE PRODUCTID='".$id."'"); <BR> } <br><br> //! A manipulator <BR> /** <BR> * Fetches a product as an associative array from the $dbobject <BR> * @return mixed <BR> */ <BR> function getProduct() { <BR>  if ( $product=$this-＞dao-＞getRow() ) <BR>   return $product; <BR>  else <BR>   return false; <BR> } <BR>} <BR>?＞

＜?php <BR>/** <BR>* Binds product data to HTML rendering <BR>*/ <BR>class ProductView { <BR> /** <BR> * Private <BR> * $model an instance of the ProductModel class <BR> */ <BR> var $model; <br><br> /** <BR> * Private <BR> * $output rendered HTML is stored here for display <BR> */ <BR> var $output; <br><br> //! A constructor. <BR> /** <BR> * Constucts a new ProductView object <BR> * @param $model an instance of the ProductModel class <BR> */ <BR> function ProductView (&$model) { <BR>  $this-＞model=& $model; <BR> } <br><br> //! A manipulator <BR> /** <BR> * Builds the top of an HTML page <BR> * @return void <BR> */ <BR> function header () { <br><br> } <br><br> //! A manipulator <BR> /** <BR> * Builds the bottom of an HTML page <BR> * @return void <BR> */ <BR> function footer () { <br><br> } <br><br> //! A manipulator <BR> /** <BR> * Displays a single product <BR> * @return void <BR> */ <BR> function productItem($id=1) { <BR>  $this-＞model-＞listProduct($id); <BR>  while ( $product=$this-＞model-＞getProduct() ) { <BR>    // Bind data to HTML <BR>  } <BR> } <br><br> //! A manipulator <BR> /** <BR> * Builds a product table <BR> * @return void <BR> */ <BR> function productTable($rownum=1) { <BR>  $rowsperpage='20'; <BR>  $this-＞model-＞listProducts($rownum,$rowsperpage); <BR>  while ( $product=$this-＞model-＞getProduct() ) { <BR>    // Bind data to HTML <BR>  } <BR> } <br><br> //! An accessor <BR> /** <BR> * Returns the rendered HTML <BR> * @return string <BR> */ <BR> function display () { <BR>  return $this-＞output; <BR> } <BR>} <BR>?＞

＜?php <BR>/** <BR>* Controls the application <BR>*/ <BR>class ProductController extends ProductView { <br><br> //! A constructor. <BR> /** <BR> * Constucts a new ProductController object <BR> * @param $model an instance of the ProductModel class <BR> * @param $getvars the incoming HTTP GET method variables <BR> */ <BR> function ProductController (&$model,$getvars=null) { <BR>  ProductView::ProductView($model); <BR>  $this-＞header(); <BR>  switch ( $getvars['view'] ) { <BR>   case "product": <BR>    $this-＞productItem($getvars['id']); <BR>    break; <BR>   default: <BR>    if ( empty ($getvars['rownum']) ) { <BR>     $this-＞productTable(); <BR>    } else { <BR>    $this-＞productTable($getvars['rownum']); <BR>    } <BR>    break; <BR>  } <BR>  $this-＞footer(); <BR> } <BR>} <BR>?＞

＜?php <BR>require_once('lib/DataAccess.php'); <BR>require_once('lib/ProductModel.php'); <BR>require_once('lib/ProductView.php'); <BR>require_once('lib/ProductController.php'); <br><br>$dao=& new DataAccess ('localhost','user','pass','dbname'); <BR>$productModel=& new ProductModel($dao); <BR>$productController=& new ProductController($productModel,$_GET); <BR>echo $productController-＞display(); <BR>?＞

$this->{$_GET['method']}($_GET['param']);

"index.php?class=ProductView&method=productItem&id=4"

$view=new $_GET['class']; <BR>$view->{$_GET['method']($_GET['id']);