问当您不知道对象的父对象是否存在时，如何保存对象？
EN

Stack Overflow用户

提问于 2012-07-18 15:43:44

回答 1查看 222关注 0票数 4

我有三张桌子，

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

员工的外键是office_id，办公室的外键是business_id。

我有一个与之相关的域对象/实体和一个与之相关的数据库映射器对象。

现在，当我提供了业务名称、办公室名称和员工名称时，如何插入新员工？

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.......

但后来我意识到，如果我必须拯救一家新企业，我就没有办法拥有一间办公室或一名员工，因此试图获得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......
   }

}

但是有这么多重复的逻辑，而且它非常不可伸缩/肮脏。

那么，应该如何实现呢？

其次，逻辑应该走向何方？它应该放在employee的映射器中吗？或者是“添加员工”操作的控制器，还是应该有一个新的模型？

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

php

model-view-controller

zend-framework

model

datamapper

回答 1

Stack Overflow用户

回答已采纳

发布于 2012-07-18 23:02:00

如果在if()代码块中使用OR语句，并将查询放在If语句中，那么只有当if语句的第一部分失败时，才会执行该语句-确保您不需要执行不必要的查询。就我个人而言，我们做了一些类似的事情，但当我们创建一个新的域时，我们在域new=1中设置了一个标志，并且我们进行了检查，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);
}