hibernate hql 与WITH 和WHERE 之间的不同

Question

大家好: 我正在研究HQL

任何人都可以解释或提供一些关于 HQL 中WITH 和 WHERE 之间不同之处的链接吗？

来自 http://docs.jboss.org/hibernate/core/3.3/reference/en/html/queryhql.html

例如:

from Cat as cat left join cat.kittens as kitten with kitten.bodyWeight > 10.0

我可以将 with 替换为 where 吗？

谢谢

Answer 1

With 用于“提供额外的连接条件”，这意味着它被添加到连接而不是 where 子句中:

from Cat as cat 
  left join cat.kittens as kitten 
  with kitten.bodyWeight > 10.0

将被翻译成这样的内容；

from Cat as cat
  left outer join Cat as kitten
    on cat.id = kitten.mother_id 
      and kitten.bodyWeight > 10.0

此时

from Cat as cat 
  left join cat.kittens as kitten 
where kitten.bodyWeight > 10.0

被翻译为

from Cat as cat
  left outer join Cat as kitten
    on cat.id = kitten.mother_id 
where
  kitten.bodyWeight > 10.0