当父级更新时，为什么Hibernate执行多个查询来更新子级？

Question

I have a many-to-one relationship with inverse="false" and cascade="all" . When I update the parent, there is an update query for this parent object and multiple update queries - one for each child object in child's collection.

Could you tell me why there are these queries for children? And how might I avoid them?

Answer 1

If you have cascade="all" that means that every operation on parent entity will call same operation on child entities. So you have to remove cascade=all if you want not to cascade operations on child entities from association.

But you should be careful with that configuration, because if you don't have cascade persist (for example) created child entity will not be persisted even it is created regularly, but you have to explicitly call save on every child entity.

You can read more about cascade types on this thread.

Answer 2

您要防止Hibernate更新子实体，应更改级联类型，删除cascade=all 。