Question

我想用Symfony 2.x在Doctrine中表示以下SQL查询：

SELECT (SELECT sum(J.amount) FROM journals as J WHERE debit_id = ?) - (SELECT   sum(J.amount) FROM gold.journals as J WHERE credit_id = ?)

我花了一些时间在querybuilder上，然后转到DQL Query：

$q = $this->getEntityManager()->createQuery('SELECT (SELECT sum(J.amount) FROM xxx\Entity\Journal as J WHERE debit = ?) - (SELECT sum(J.amount) FROM xxx\Entity\Journal as J WHERE credit = ?))');

这两者都导致了一些语法异常：

Syntax Error] line 0, col 97: Error: Expected Doctrine\ORM\Query\Lexer::T_FROM, got '-'

什么是运行此查询的最佳doctrine / symfony方式？

Answer 1

尝试this method在Doctrine中执行嵌套查询。

Answer 2

Oukay，现在发现了一个解决方案：

    $qb = $this->getEntityManager()->createQueryBuilder();
    $x = $qb->select()
        ->addSelect('(SELECT sum(J1.amount) FROM xxx\Entity\Journal as J1 WHERE J1.debit = :id)')
        ->addSelect('(SELECT sum(J2.amount) FROM xxx\Entity\Journal as J2 WHERE J2.credit = :id)')
        ->from("xxx\Entity\Journal", "tmp")
        ->setMaxResults(1)
        ->setParameter('id', 1);

    return print_r($x->getQuery()->getArrayResult()[0],true);

它有点难看，因为它看起来像Query Builder NEEDS - ＆gt; from（）被设置为某种东西......这就是为什么我使用setMaxResults来限制输出。它仍然不是完美的解决方案，但是......我很高兴开始。

Answer 3

尝试使用以下内容：

$q = $this->getEntityManager()->createQuery('SELECT 
    (
        (SELECT sum(J.amount) FROM xxx\Entity\Journal as J WHERE debit = ?) 
            - 
        (SELECT sum(J.amount) FROM xxx\Entity\Journal as J WHERE credit = ?)
    ) as total
');

然后获取查询结果的标量值。

$q->getQuery->getSingleScalarResult();

select语句中的子查询以计算总和

3 个答案: