php – 当你不知道它的父对象是否存在时,如何保存对象？

发布时间：2020-12-13 16:46:11 所属栏目：PHP教程来源：网络整理

导读：我有三张桌子, Business: id nameOffice: id name business_idEmployee: id name office_id 员工将office_id作为外键,办公室将business_id作为外键. 我有一个与每个相关的域对象/实体和与每个相关的数据库映射器对象. 现在,当我由公司名称,办公室名称和员工

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.

我有一个与每个相关的域对象/实体和与每个相关的数据库映射器对象.

现在,当我由公司名称,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.那么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,它是非常不可扩展/脏的.

那应该怎么做呢？

其次逻辑应该去哪里？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:)

解决方法

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.我们个人做了类似的事情,但是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,我们检查这个,相同的方法只是删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);
}

（编辑：李大同）

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