Question

我试图将ORDER BY列作为DQL中的参数传递，如下所示：

$this->em->createQuery("SELECT t FROM Entities\Topic t ORDER BY :order")
     ->setParameters( array('order' => 't.name') )->getResult();

我猜它不起作用，因为setParameter会转义：order，但是下面的解决方案似乎不太好：

$order = 't.name'; // Dynamic value
$this->em->createQuery("SELECT t FROM Entities\Topic t ORDER BY $order")
     ->getResult();

有没有更好的方法来解决这个问题？

Answer 1

在这种情况下，使用Doctrines Querybuilder：

$order = 't.name'; // Dynamic value

$qb = $this->_em->createQueryBuilder();
$qb->select('t')
   ->from('Entities\Topic', 't')
   ->orderBy($order);

Answer 2

我知道，这是一个老问题，但直到今天这个“问题”仍然存在。所以，如果你想使用动态排序，你应该使用学说 queryBuilder。

我最近测试了当前可用于动态排序的学说类型。就我而言，我在 dql 中设置了 order 列，只想注入 ASC/DESC。

现在，这是测试输出：

DQL: SELECT w FROM App\Entity\Worker w ORDER BY w.id :order
Type "array" is invalid
Type "ascii_string" is invalid
Type "bigint" is invalid
Type "binary" is invalid
Type "blob" is invalid
Type "boolean" is invalid
Type "date" is invalid
Type "date_immutable" is invalid
Type "dateinterval" is invalid
Type "datetime" is invalid
Type "datetime_immutable" is invalid
Type "datetimetz" is invalid
Type "datetimetz_immutable" is invalid
Type "decimal" is invalid
Type "float" is invalid
Type "guid" is invalid
Type "integer" is invalid
Type "json" is invalid
Type "object" is invalid
Type "simple_array" is invalid
Type "smallint" is invalid
Type "string" is invalid
Type "text" is invalid
Type "time" is invalid
Type "time_immutable" is invalid

我使用的是 Symfony 5.3 和 Doctrine 2.9

如果有人对代码感兴趣，我曾经测试过：我只是在我的 symfony 项目中创建了一个学说实体。然后我在相关的存储库对象中创建了一个测试方法：

public function testOrder(string $order = 'ASC'): array
{
    $query = $this->getEntityManager()->createQuery(
        'SELECT w
        FROM App\Entity\Worker w
        ORDER BY w.id :order'
    );
    // map taken from: vendor/doctrine/dbal/lib/Doctrine/DBAL/Types/Type.php:101
    $doctrineTypeMap = [
        Types::ARRAY,
        Types::ASCII_STRING,
        Types::BIGINT,
        Types::BINARY,
        Types::BLOB,
        Types::BOOLEAN,
        Types::DATE_MUTABLE,
        Types::DATE_IMMUTABLE,
        Types::DATEINTERVAL,
        Types::DATETIME_MUTABLE,
        Types::DATETIME_IMMUTABLE,
        Types::DATETIMETZ_MUTABLE,
        Types::DATETIMETZ_IMMUTABLE,
        Types::DECIMAL,
        Types::FLOAT,
        Types::GUID,
        Types::INTEGER,
        Types::JSON,
        Types::OBJECT,
        Types::SIMPLE_ARRAY,
        Types::SMALLINT,
        Types::STRING,
        Types::TEXT,
        Types::TIME_MUTABLE,
        Types::TIME_IMMUTABLE,
    ];
    print_r('DQL: ' . $query->getDQL() . "<br/>");
    foreach ($doctrineTypeMap as $mappedType) {
        try {
            $query->setParameter('order', $order, $mappedType);
            print_r('Type "' . $mappedType . '" is ');
            $query->getSQL();
            print_r('valid' . "<br/>");
        } catch (\Exception $e) {
            print_r('invalid' . "<br/>");
        }
    }
    // Prevent symfony from rendering a view
    die();
}

Doctrine DQL动态ORDER BY参数

2 个答案: