[英]How do I check if object was found in a Doctrine2 repository?
I am finding a entity by its PK as follow: 我通过它的PK找到一个实体如下:
$ent = $em->getRepository('AppBundle:Representative')->find($id)
What is the right way to check whether $ent
is a real Representative object or not? 检查
$ent
是否是真正的代表对象的正确方法是什么? What I mean with real is that $ent
currently exists on DB and was returned since I am planning to use the same results for INSERT
and UPDATE
. 我的真实含义是
$ent
当前存在于DB上并且由于我计划对INSERT
和UPDATE
使用相同的结果而被返回。 In pseudo-code what is on my head is: 在伪代码中,我的头脑是:
if (ent is Representative)
{
// Update its values
} else {
// Create a new Representative
}
I was thinking in use is_object()
or even instanceof
but I am not sure if they will do the job or if $ent
will be an object even if Representative doesn't exist on DB. 我在考虑使用
is_object()
甚至是instanceof
但我不确定他们是否会完成这项工作,或者即使代理在DB上不存在, $ent
也是一个对象。 Any advice on this? 有什么建议吗? How I can achieve that?
我怎么能做到这一点?
EntityRepository::find()
method (which you use) returns an object
, or null
if the object couldn't be found in the database. EntityRepository::find()
方法(您使用)返回一个object
,如果在数据库中找不到该object
,则返回null
。 All of the following conditions are valid: 以下所有条件均有效:
if ($entity) {
}
if (null !== $entity) {
}
if ($entity instanceof Representative) {
}
Choose one that suits your coding standards the best, and use it consistently. 选择最适合您编码标准的产品,并始终如一地使用。
If you don't need to create a new object if it's not found, better throw an exception and handle it appropriately. 如果您不需要创建新对象,则最好抛出异常并适当地处理它。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.