Symfony 左连接查询

Posted 2023-04-19

【中文标题】Symfony 左连接查询

【英文标题】：Symfony left join query

【发布时间】：2010-11-16 13:18:15

【问题描述】：

以下查询运行正常：

$q = $this->createQuery('e')
     ->where('e.Persons_idUser =?', $request)
     ->leftJoin('e.JobTitles jt')
     ->leftJoin('e.EmploymentLevels el');

但是当我遍历结果并尝试从左连接访问字段时：

 foreach ($work as $w)
   echo $w->employername;
   echo $w->jobtitle; // this is from the left join
   echo $w->employmentlevel; // this is from the left join
 

我收到以下错误消息： “经验”上的未知记录属性/相关组件“职位”

有人知道吗？如何回显左连接中的字段？

【问题讨论】：

你需要做类似$w->EmploymentLevels->employmentlevel

【参考方案1】：

<?php
    foreach ($work as $w)
        echo $w->employername;
        foreach($w->JobTitles as $job)
            echo $job->jobtitle; // this is from the left join
        
        foreach($w->EmploymentLevels as $employ)
            echo $employ->employmentlevel; // this is from the left join
        
    

?>

这将在 symfony 返回对象数组并且连接表中的元素位于子数组下时起作用

【参考方案2】：

解决方案：

foreach ($work as $w)
 echo $w->employername;
 echo $w->JobTitles->jobtitle; // this is from the left join
 echo $w->EmploymentLevels->employmentlevel; // this is from the left join