域模型不扩展任何内容.它们只是用于封装业务逻辑的普通类.他们可能使用数据访问对象，所以在类内部可能有一个行数据网关对象的protected实例.Row 对象通常比 Table 对象更接近地表示域的实例.此外，您始终可以使用Row 的getTable() 方法获取Table 对象.

Domain Models extend nothing. They're just plain classes you use to encapsulate business logic. They may use data access objects, so there may be a protected instance of a row data gateway object inside the class. A Row object usually represents an instance of the domain more closely than a Table object. Besides, you can always get the Table object with the Row's getTable() method.

通常，DM 类具有一个接口，其中包含与您可以使用该类执行的更高级别操作相对应的方法.但您不一定要显示所有数据访问操作.

Typically DM classes have an interface with methods corresponding to higher-level operations you can do with that class. But you don't necessarily want to surface all data access operations.

class Person {
  // Zend_Db_Table_Row object
  protected $data; 

  public function subscribeToService(Service $service) { ... }

  public function sendMailTo(Person $recipient) { ... }

  public function changePassword($newPassword) { ... }
}

我去年 春季也写了关于这个主题的博客，并在 ZF 邮件列表上写了它 最近.

I also blogged about this subject last spring, and wrote about it on the ZF mailing list recently.

就教程和资源而言，请尝试 http://domaindrivendesign.org/

As far as tutorials and resources, try http://domaindrivendesign.org/