java - hibernate 条件 : inheritence: Get a list of only the root class entities

Question

假设我有:

@Inheritance(strategy = InheritanceType.JOINED)
public class Child extends Parent{
}

我怎样才能只选择保存为父项而不是子项的实例。

谢谢

Answer 1

看看section 14.9 of the Hibernate documentation的底部:

The special property class accesses the discriminator value of an instance in the case of polymorphic persistence. A Java class name embedded in the where clause will be translated to its discriminator value.

from Cat cat where cat.class = DomesticCat

所以我相信在您的情况下，您可以使用 HQL 约束 ... where class=Parent 来过滤掉 Child 的实例。