Question

我有三张桌子，

Business:
  id
  name
Office:
  id
  name
  business_id
Employee:
  id
  name
  office_id

员工将office_id作为外键，办公室将business_id作为外键。

我有一个与每个域对象/实体相关的域对象/实体以及与每个域对象相关的数据库映射器对象。

现在，当我被公司名称，办公室名称和员工姓名提供时，如何插入新的员工？

最初我认为逻辑应该是这样的：

$businessMapper = new businessMapper();  
$business = $businessMapper->findBusinessByName($business_name);

if ($business == false) {   
     $business = new businessEntity(array(         
                     'businessName' => $business_name,            
                   ));        
     $businessMapper->save($business);   
  } 

 $officeMapper = new officeMapper();     
 $office = $officeMapper->getOfficeByName($office_name, $business);

.......etc.......

但后来我才意识到，如果我必须保存一项新业务，我就无法拥有办公室或员工，因此尝试获取它们是一种浪费的查询。所以我想我应该创建一个if / else结构。

get business entity by business_name  
if ($business == false) {
    create business entity
    save business entity
    create office entity
    save office entity
    create employee entity
    save employee entity
} else {
   get office entity by office_name + business_id

   if (office == false) {
     create office entity
     save office entity
     create employee entity
     save employee entity

   } else {

     ......etc......
   }

}

但是有太多重复的逻辑，它非常不可扩展/脏。

那应该怎样实现呢？

其次，逻辑应该放在哪里？它应该放在员工的映射器中吗？或“添加员工”操作的控制器，还是应该有新模型？

我使用Zend作为我的框架，但我认为这个问题适用于所有MVC样式结构，所以无论您的框架偏好如何，请随时回复：）

Answer 1

如果在if（）块期间使用OR语句并将查询放在if语句中，那么只有在IF语句的第一部分失败时才会执行它 - 确保您不会不必要地执行查询。就个人而言，我们做了类似的事情，但是当我们创建一个新域时，我们在域new = 1中设置了一个标志，我们检查了这个，相同的方法只是消除了对这些脏变量的需要; - ）

$businessMapper = Factory::getMapper('business');

if (!$business = $businessMapper->findByName("Business Name"))
{
    $business = $businessMapper->create();
    $business->setName("Business Name");
    $businessMapper->save($business);

    $newBusiness = true;
}

$officeMapper = Factory::getMapper('office');

if (isset($newBusiness) || !$office = $officeMapper->findByName("Office Name"))
{
    $office = $officeMapper->create();
    $office->setName("Office Name");
    $office->setBusiness($business->getId());
    $officeMapper->save($office);

    $newOffice = true;
}

$employeeMapper = Factory::getMapper('employee');

if (isset($newOffice) || !$employee = $employeeMapper->findByName("Employee"))
{
    $employee = $employeeMapper->create();
    $employee->setName("Employee Name");
    $employee->setOffice($office->getId());

    $employeeMapper->save($employee);
}

当您不知道对象是否存在时，如何保存对象？

1 个答案: