Hibernate in action

最新推荐文章于 2017-04-13 10:01:28 发布

dengyin2000

最新推荐文章于 2017-04-13 10:01:28 发布

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分类专栏：我的自创文章. 文章标签： hibernate delete associations attributes object action

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博客介绍了one to many中inverse=\true\表示双向关联，需另一边声明many to one。还阐述了在元数据中映射实体关联的多种cascade属性，如cascade=\none\让Hibernate忽略关联，cascade=\delete\在对象删除时导航关联并删除持久实例等。

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one to many 中的inverse="true" 表示这是个双向关联.需要在另一边也声明 many to one.

You can map entity associations in metadata with the following attributes:
■ cascade="none", the default, tells Hibernate to ignore the association.
■ cascade="save-update" tells Hibernate to navigate the association when the
transaction is committed and when an object is passed to save() or
update() and save newly instantiated transient instances and persist changes to
detached instances.
■ cascade="delete" tells Hibernate to navigate the association and delete persistent
instances when an object is passed to delete().
■ cascade="all" means to cascade both save-update and delete, as well as
calls to evict and lock.
■ cascade="all-delete-orphan" means the same as cascade="all" but, in addition,
Hibernate deletes any persistent entity instance that has been removed
(dereferenced) from the association (for example, from a collection).
■ cascade="delete-orphan" Hibernate will delete any persistent entity
instance that has been removed (dereferenced) from the association (for
example, from a collection).