子查询值的doctrine2减法

use Doctrine\ORM\EntityManagerInterface;
use Doctrine\ORM\QueryBuilder;

// 获取EntityManager
$entityManager = // your entity manager instance

// 创建QueryBuilder
$queryBuilder = $entityManager->createQueryBuilder();

// 创建主查询
$queryBuilder->select('a')
    ->from('Your\Entity\Class', 'a')
    ->where(/* add your conditions */);

// 创建子查询
$subQueryBuilder = $entityManager->createQueryBuilder();
$subQueryBuilder->select('b.value')
    ->from('Your\Other\Entity\Class', 'b')
    ->where(/* add your conditions */);

// 将子查询的结果与主查询的结果进行减法运算
$queryBuilder->andWhere(
    $queryBuilder->expr()->diff(
        $queryBuilder->getQuery()->getDQL(),
        $subQueryBuilder->getQuery()->getDQL()
    )
);

// 执行查询
$result = $queryBuilder->getQuery()->getResult();