Doctrine SQL查询顺序由ASC NULL Last

Question

我使用Doctrine 2.4。我尝试按优先级递增优先级为NULL，优先级为0，最后优先级为0。

SELECT * FROM campaign ORDER BY priority IS NULL, priority = 0, priority ASC

你知道我怎么能做到这一点吗？

$query->addOrderBy('c.priority', 'ASC');

Answer 1

order by case when priority is null then 1 else 0 end, priority

Answer 2

我找到了解决方案，我做到了：

$query->addSelect('CASE WHEN c.priority IS NULL THEN 1 ELSE 0 END as HIDDEN priority_is_null');
$query->addSelect('CASE WHEN c.priority = 0 THEN 1 ELSE 0 END as HIDDEN priority_is_zero');
$query->addOrderBy('priority_is_null', 'ASC');
$query->addOrderBy('priority_is_zero', 'ASC');
$query->addOrderBy('c.priority', 'ASC');