QueryBuilder/Doctrine 选择加入 groupby

所以最近我一直在思考，但还找不到这个问题的解决方案，因为我缺乏对doctrine2和symfony查询生成器的开发。

我有 2 张桌子： 目标：id、user_id、target_value... 储蓄：id、goal_id、金额

我需要从目标中进行选择（我的表中的所有信息都来自目标表，除了我需要从每个目标的储蓄表中计算总和（金额），这样我可以向用户显示做了多少他为了自己的目标而储蓄）

这是 MySQL 查询：

    select 

    admin_goals.created,
    admin_goals.description,
    admin_goals.goal_date,
    admin_goals.value,
    admin_goals.budget_categ,
    sum(admin_savings.value) 

    from admin_goals 
inner join admin_savings on admin_savings.goal_id=admin_goals.id 
    where admin_goals.user_id=1 
    group by admin_goals.id

It returns what I want but I have no idea how to implement it with doctrine or query builder, can you please show me an example in both ways? I highly appreciate it !

我假设您只需要这个字段，而不需要您的AdminGoals实体。在你的AdminGoalsRepository你可以这样做：

public function getGoalsByUser(User $user) 
{
    $qb = $this->createQueryBuilder('goal');
    $qb->select('SUM(savings.value) AS savings_value')
       ->addSelect('goal.created')
       ->addSelect('goal.description')
       ->addSelect('goal.goalDate')
       ->addSelect('goal.value')
       ->addSelect('goal.budgetCat') //is this an entity? it will be just an ID
       ->join('goal.adminSavings', 'savings', Join::WITH))
       ->where($qb->expr()->eq('goal.user', ':user'))
       ->groupBy('goal.id')
       ->setParameter('user', $user);

    return $qb->getQuery()->getScalarResult();
}

请记住，返回对象将是一个行数组，每行都是一个关联的数组，其键与上面的映射类似。

Edit

更新问题后，我将更改我建议的功能，但如果其他人想看到差异，我将保留上面的示例。

首先，因为这是一个单向的 ManyToOneAdminSavings and AdminGoals，自定义查询应该位于AdminSavingsRepository (不像上面那样）。另外，既然你想要一个聚合字段 http://doctrine-orm.readthedocs.org/en/latest/cookbook/aggregate-fields.html这会"break"您的一些数据获取。当您不仅仅是渲染模板时，请尝试保持尽可能多的 OOP。

public function getSavingsByUser(User $user)
{
    $qb = $this->createQueryBuilder('savings');
    //now we can use the expr() function
    $qb->select('SUM(savings.value) AS savings_value')
       ->addSelect('goal.created')
       ->addSelect('goal.description')
       ->addSelect('goal.goalDate')
       ->addSelect('goal.value')
       ->addSelect('goal.budgetCat') //this will be just an ID
       ->join('savings.goal', 'goal', Join::WITH))
       ->where($qb->expr()->eq('goal.user', ':user'))
       ->groupBy('goal.id')
       ->setParameter('user', $user);

       return $qb->getQuery()->getScalarResult();
}

Bonus

public function FooAction($args) 
{
    $em = $this->getDoctrine()->getManager();
    $user = $this->getUser();
    //check if user is User etc depends on your config
    ...

    $savings = $em->getRepository('AcmeBundle:AdminSavings')->getSavingsByUser($user);

    foreach($savings as $row) {
        $savings = $row['savings_value'];
        $goalId =  $row['id'];  
        $goalCreated = $row['created'];
        [...]
    }
    [...]
}