收集袋与注释 [英] Collection Bag wtih annotation
问题描述
我正在观看由 Burt Beckwith制作的精彩视频
http://www.infoq.com/presentations/GORM-Performance 他说:
在传统的Hibernate中,您可以将集合映射为Bag,
其中只是一个没有订单或唯一性保证的常规集合
如何映射此集合时没有订单或唯一性和注释?如果您使用 List
作为参考类型,但是 不要指定一个索引号列,你将有一个没有唯一性要求的无序集合。是的,这个列表是在java层次上的一个有序集合,但是在实体的副本中没有保证他们有相同的订单。
@OneToMany
私人列表< OtherEntity>其他实体;
就这样!
I'm watching a good video made by Burt Beckwith
http://www.infoq.com/presentations/GORM-Performance
he says:
"In traditional Hibernate you could map the collection as Bag,
which is just a regular Collection with no ordering or uniqueness guarantees"
How Can I map this collection with no ordering or uniqueness with annotation? Thanks.
If you use a List
as the reference type but do not specify an index number column, you will have an unordered collection with no uniqueness requirement. Yes the list is an ordered collection at the java level, but there is no guarantee across copies of the entity that they have the same order.
@OneToMany
private List<OtherEntity> otherEntities;
That's all!
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